We have some reasons to kill netdev->priv:
1. netdev->priv is equal to netdev_priv().
2. netdev_priv() wraps the calculation of netdev->priv's offset, obviously
netdev_priv() is more flexible than netdev->priv.
But we cann't kill netdev->priv, because so many drivers reference to it
directly.
OK, becasue Dave S. Miller said, "every direct netdev->priv usage is a bug",
and I want to kill netdev->priv later, I decided to convert all the direct
reference of netdev->priv first.
Different to readonly reference of netdev->priv, in this driver, netdev->priv
was changed. I use netdev->ml_priv to replace netdev->priv.
Signed-off-by: Wang Chen <[email protected]>
---
drivers/net/wireless/zd1201.c | 64 ++++++++++++++++++++--------------------
1 files changed, 32 insertions(+), 32 deletions(-)
diff --git a/drivers/net/wireless/zd1201.c b/drivers/net/wireless/zd1201.c
index b16ec6e..abbf327 100644
--- a/drivers/net/wireless/zd1201.c
+++ b/drivers/net/wireless/zd1201.c
@@ -745,7 +745,7 @@ static int zd1201_join(struct zd1201 *zd, char *essid, int essidlen)
static int zd1201_net_open(struct net_device *dev)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
/* Start MAC with wildcard if no essid set */
if (!zd->mac_enabled)
@@ -783,7 +783,7 @@ static int zd1201_net_stop(struct net_device *dev)
*/
static int zd1201_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
unsigned char *txbuf = zd->txdata;
int txbuflen, pad = 0, err;
struct urb *urb = zd->tx_urb;
@@ -833,7 +833,7 @@ static int zd1201_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
static void zd1201_tx_timeout(struct net_device *dev)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
if (!zd)
return;
@@ -848,7 +848,7 @@ static void zd1201_tx_timeout(struct net_device *dev)
static int zd1201_set_mac_address(struct net_device *dev, void *p)
{
struct sockaddr *addr = p;
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
int err;
if (!zd)
@@ -865,21 +865,21 @@ static int zd1201_set_mac_address(struct net_device *dev, void *p)
static struct net_device_stats *zd1201_get_stats(struct net_device *dev)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
return &zd->stats;
}
static struct iw_statistics *zd1201_get_wireless_stats(struct net_device *dev)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
return &zd->iwstats;
}
static void zd1201_set_multicast(struct net_device *dev)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
struct dev_mc_list *mc = dev->mc_list;
unsigned char reqbuf[ETH_ALEN*ZD1201_MAXMULTI];
int i;
@@ -899,7 +899,7 @@ static void zd1201_set_multicast(struct net_device *dev)
static int zd1201_config_commit(struct net_device *dev,
struct iw_request_info *info, struct iw_point *data, char *essid)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
return zd1201_mac_reset(zd);
}
@@ -914,7 +914,7 @@ static int zd1201_get_name(struct net_device *dev,
static int zd1201_set_freq(struct net_device *dev,
struct iw_request_info *info, struct iw_freq *freq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
short channel = 0;
int err;
@@ -939,7 +939,7 @@ static int zd1201_set_freq(struct net_device *dev,
static int zd1201_get_freq(struct net_device *dev,
struct iw_request_info *info, struct iw_freq *freq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
short channel;
int err;
@@ -955,7 +955,7 @@ static int zd1201_get_freq(struct net_device *dev,
static int zd1201_set_mode(struct net_device *dev,
struct iw_request_info *info, __u32 *mode, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
short porttype, monitor = 0;
unsigned char buffer[IW_ESSID_MAX_SIZE+2];
int err;
@@ -1017,7 +1017,7 @@ static int zd1201_set_mode(struct net_device *dev,
static int zd1201_get_mode(struct net_device *dev,
struct iw_request_info *info, __u32 *mode, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
short porttype;
int err;
@@ -1093,7 +1093,7 @@ static int zd1201_get_range(struct net_device *dev,
static int zd1201_get_wap(struct net_device *dev,
struct iw_request_info *info, struct sockaddr *ap_addr, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
unsigned char buffer[6];
if (!zd1201_getconfig(zd, ZD1201_RID_COMMSQUALITY, buffer, 6)) {
@@ -1121,7 +1121,7 @@ static int zd1201_set_scan(struct net_device *dev,
static int zd1201_get_scan(struct net_device *dev,
struct iw_request_info *info, struct iw_point *srq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
int err, i, j, enabled_save;
struct iw_event iwe;
char *cev = extra;
@@ -1213,7 +1213,7 @@ static int zd1201_get_scan(struct net_device *dev,
static int zd1201_set_essid(struct net_device *dev,
struct iw_request_info *info, struct iw_point *data, char *essid)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
if (data->length > IW_ESSID_MAX_SIZE)
return -EINVAL;
@@ -1228,7 +1228,7 @@ static int zd1201_set_essid(struct net_device *dev,
static int zd1201_get_essid(struct net_device *dev,
struct iw_request_info *info, struct iw_point *data, char *essid)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
memcpy(essid, zd->essid, zd->essidlen);
data->flags = 1;
@@ -1249,7 +1249,7 @@ static int zd1201_get_nick(struct net_device *dev, struct iw_request_info *info,
static int zd1201_set_rate(struct net_device *dev,
struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
short rate;
int err;
@@ -1282,7 +1282,7 @@ static int zd1201_set_rate(struct net_device *dev,
static int zd1201_get_rate(struct net_device *dev,
struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
short rate;
int err;
@@ -1315,7 +1315,7 @@ static int zd1201_get_rate(struct net_device *dev,
static int zd1201_set_rts(struct net_device *dev, struct iw_request_info *info,
struct iw_param *rts, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
int err;
short val = rts->value;
@@ -1335,7 +1335,7 @@ static int zd1201_set_rts(struct net_device *dev, struct iw_request_info *info,
static int zd1201_get_rts(struct net_device *dev, struct iw_request_info *info,
struct iw_param *rts, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
short rtst;
int err;
@@ -1352,7 +1352,7 @@ static int zd1201_get_rts(struct net_device *dev, struct iw_request_info *info,
static int zd1201_set_frag(struct net_device *dev, struct iw_request_info *info,
struct iw_param *frag, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
int err;
short val = frag->value;
@@ -1373,7 +1373,7 @@ static int zd1201_set_frag(struct net_device *dev, struct iw_request_info *info,
static int zd1201_get_frag(struct net_device *dev, struct iw_request_info *info,
struct iw_param *frag, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
short fragt;
int err;
@@ -1402,7 +1402,7 @@ static int zd1201_get_retry(struct net_device *dev,
static int zd1201_set_encode(struct net_device *dev,
struct iw_request_info *info, struct iw_point *erq, char *key)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
short i;
int err, rid;
@@ -1459,7 +1459,7 @@ static int zd1201_set_encode(struct net_device *dev,
static int zd1201_get_encode(struct net_device *dev,
struct iw_request_info *info, struct iw_point *erq, char *key)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
short i;
int err;
@@ -1492,7 +1492,7 @@ static int zd1201_get_encode(struct net_device *dev,
static int zd1201_set_power(struct net_device *dev,
struct iw_request_info *info, struct iw_param *vwrq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
short enabled, duration, level;
int err;
@@ -1531,7 +1531,7 @@ out:
static int zd1201_get_power(struct net_device *dev,
struct iw_request_info *info, struct iw_param *vwrq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
short enabled, level, duration;
int err;
@@ -1618,7 +1618,7 @@ static const iw_handler zd1201_iw_handler[] =
static int zd1201_set_hostauth(struct net_device *dev,
struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
if (!zd->ap)
return -EOPNOTSUPP;
@@ -1629,7 +1629,7 @@ static int zd1201_set_hostauth(struct net_device *dev,
static int zd1201_get_hostauth(struct net_device *dev,
struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
short hostauth;
int err;
@@ -1648,7 +1648,7 @@ static int zd1201_get_hostauth(struct net_device *dev,
static int zd1201_auth_sta(struct net_device *dev,
struct iw_request_info *info, struct sockaddr *sta, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
unsigned char buffer[10];
if (!zd->ap)
@@ -1664,7 +1664,7 @@ static int zd1201_auth_sta(struct net_device *dev,
static int zd1201_set_maxassoc(struct net_device *dev,
struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
int err;
if (!zd->ap)
@@ -1679,7 +1679,7 @@ static int zd1201_set_maxassoc(struct net_device *dev,
static int zd1201_get_maxassoc(struct net_device *dev,
struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = dev->ml_priv;
short maxassoc;
int err;
@@ -1779,7 +1779,7 @@ static int zd1201_probe(struct usb_interface *interface,
if (!zd->dev)
goto err_start;
- zd->dev->priv = zd;
+ zd->dev->ml_priv = zd;
zd->dev->open = zd1201_net_open;
zd->dev->stop = zd1201_net_stop;
zd->dev->get_stats = zd1201_get_stats;
--
1.5.3.4
On Fri, Sep 05, 2008 at 11:29:36AM +0800, Wang Chen wrote:
> We have some reasons to kill netdev->priv:
> 1. netdev->priv is equal to netdev_priv().
> 2. netdev_priv() wraps the calculation of netdev->priv's offset, obviously
> netdev_priv() is more flexible than netdev->priv.
> But we cann't kill netdev->priv, because so many drivers reference to it
> directly.
>
> OK, becasue Dave S. Miller said, "every direct netdev->priv usage is a bug",
> and I want to kill netdev->priv later, I decided to convert all the direct
> reference of netdev->priv first.
>
> Different to readonly reference of netdev->priv, in this driver, netdev->priv
> was changed. I use netdev->ml_priv to replace netdev->priv.
>
> Signed-off-by: Wang Chen <[email protected]>
Same comment as the other patch.
Also, I have to be honest and say that I had never been aware of
dev->ml_priv before, so I'm not entirely sure what it is. However,
from the comment at it's definision ("mid-layer private") and it's
usage in qeth, loopback, and ppp, I'm not at all sure that you are
using it as intended.
Can you explain?
Thanks,
John
--
John W. Linville
[email protected]
On Fri, Sep 05, 2008 at 11:29:36AM +0800, Wang Chen wrote:
> We have some reasons to kill netdev->priv:
> 1. netdev->priv is equal to netdev_priv().
> 2. netdev_priv() wraps the calculation of netdev->priv's offset, obviously
> netdev_priv() is more flexible than netdev->priv.
> But we cann't kill netdev->priv, because so many drivers reference to it
> directly.
>
> OK, becasue Dave S. Miller said, "every direct netdev->priv usage is a bug",
> and I want to kill netdev->priv later, I decided to convert all the direct
> reference of netdev->priv first.
>
> Different to readonly reference of netdev->priv, in this driver, netdev->priv
> was changed. I use netdev->ml_priv to replace netdev->priv.
>
> Signed-off-by: Wang Chen <[email protected]>
I don't think this is the right approach for this driver. Alternative
patch to follow...
John
--
John W. Linville Linux should be at the core
[email protected] of your literate lifestyle.
We have some reasons to kill netdev->priv:
1. netdev->priv is equal to netdev_priv().
2. netdev_priv() wraps the calculation of netdev->priv's offset, obviously
netdev_priv() is more flexible than netdev->priv.
But we cann't kill netdev->priv, because so many drivers reference to it
directly.
OK, becasue Dave S. Miller said, "every direct netdev->priv usage is a bug",
and I want to kill netdev->priv later, I decided to convert all the direct
reference of netdev->priv first.
(Original patch posted by Wang Chen <[email protected]> w/ above
changelog but using dev->ml_priv. That doesn't seem appropriate
to me for this driver, so I've revamped it to use netdev_priv()
instead. -- JWL)
Cc: Wang Chen <[email protected]>
Signed-off-by: John W. Linville <[email protected]>
---
drivers/net/wireless/zd1201.c | 115 ++++++++++++++++++++---------------------
1 files changed, 56 insertions(+), 59 deletions(-)
diff --git a/drivers/net/wireless/zd1201.c b/drivers/net/wireless/zd1201.c
index b16ec6e..1652d67 100644
--- a/drivers/net/wireless/zd1201.c
+++ b/drivers/net/wireless/zd1201.c
@@ -745,7 +745,7 @@ static int zd1201_join(struct zd1201 *zd, char *essid, int essidlen)
static int zd1201_net_open(struct net_device *dev)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
/* Start MAC with wildcard if no essid set */
if (!zd->mac_enabled)
@@ -783,7 +783,7 @@ static int zd1201_net_stop(struct net_device *dev)
*/
static int zd1201_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
unsigned char *txbuf = zd->txdata;
int txbuflen, pad = 0, err;
struct urb *urb = zd->tx_urb;
@@ -833,7 +833,7 @@ static int zd1201_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
static void zd1201_tx_timeout(struct net_device *dev)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
if (!zd)
return;
@@ -848,7 +848,7 @@ static void zd1201_tx_timeout(struct net_device *dev)
static int zd1201_set_mac_address(struct net_device *dev, void *p)
{
struct sockaddr *addr = p;
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
int err;
if (!zd)
@@ -865,21 +865,21 @@ static int zd1201_set_mac_address(struct net_device *dev, void *p)
static struct net_device_stats *zd1201_get_stats(struct net_device *dev)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
return &zd->stats;
}
static struct iw_statistics *zd1201_get_wireless_stats(struct net_device *dev)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
return &zd->iwstats;
}
static void zd1201_set_multicast(struct net_device *dev)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
struct dev_mc_list *mc = dev->mc_list;
unsigned char reqbuf[ETH_ALEN*ZD1201_MAXMULTI];
int i;
@@ -899,7 +899,7 @@ static void zd1201_set_multicast(struct net_device *dev)
static int zd1201_config_commit(struct net_device *dev,
struct iw_request_info *info, struct iw_point *data, char *essid)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
return zd1201_mac_reset(zd);
}
@@ -914,7 +914,7 @@ static int zd1201_get_name(struct net_device *dev,
static int zd1201_set_freq(struct net_device *dev,
struct iw_request_info *info, struct iw_freq *freq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
short channel = 0;
int err;
@@ -939,7 +939,7 @@ static int zd1201_set_freq(struct net_device *dev,
static int zd1201_get_freq(struct net_device *dev,
struct iw_request_info *info, struct iw_freq *freq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
short channel;
int err;
@@ -955,7 +955,7 @@ static int zd1201_get_freq(struct net_device *dev,
static int zd1201_set_mode(struct net_device *dev,
struct iw_request_info *info, __u32 *mode, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
short porttype, monitor = 0;
unsigned char buffer[IW_ESSID_MAX_SIZE+2];
int err;
@@ -1017,7 +1017,7 @@ static int zd1201_set_mode(struct net_device *dev,
static int zd1201_get_mode(struct net_device *dev,
struct iw_request_info *info, __u32 *mode, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
short porttype;
int err;
@@ -1093,7 +1093,7 @@ static int zd1201_get_range(struct net_device *dev,
static int zd1201_get_wap(struct net_device *dev,
struct iw_request_info *info, struct sockaddr *ap_addr, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
unsigned char buffer[6];
if (!zd1201_getconfig(zd, ZD1201_RID_COMMSQUALITY, buffer, 6)) {
@@ -1121,7 +1121,7 @@ static int zd1201_set_scan(struct net_device *dev,
static int zd1201_get_scan(struct net_device *dev,
struct iw_request_info *info, struct iw_point *srq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
int err, i, j, enabled_save;
struct iw_event iwe;
char *cev = extra;
@@ -1213,7 +1213,7 @@ static int zd1201_get_scan(struct net_device *dev,
static int zd1201_set_essid(struct net_device *dev,
struct iw_request_info *info, struct iw_point *data, char *essid)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
if (data->length > IW_ESSID_MAX_SIZE)
return -EINVAL;
@@ -1228,7 +1228,7 @@ static int zd1201_set_essid(struct net_device *dev,
static int zd1201_get_essid(struct net_device *dev,
struct iw_request_info *info, struct iw_point *data, char *essid)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
memcpy(essid, zd->essid, zd->essidlen);
data->flags = 1;
@@ -1249,7 +1249,7 @@ static int zd1201_get_nick(struct net_device *dev, struct iw_request_info *info,
static int zd1201_set_rate(struct net_device *dev,
struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
short rate;
int err;
@@ -1282,7 +1282,7 @@ static int zd1201_set_rate(struct net_device *dev,
static int zd1201_get_rate(struct net_device *dev,
struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
short rate;
int err;
@@ -1315,7 +1315,7 @@ static int zd1201_get_rate(struct net_device *dev,
static int zd1201_set_rts(struct net_device *dev, struct iw_request_info *info,
struct iw_param *rts, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
int err;
short val = rts->value;
@@ -1335,7 +1335,7 @@ static int zd1201_set_rts(struct net_device *dev, struct iw_request_info *info,
static int zd1201_get_rts(struct net_device *dev, struct iw_request_info *info,
struct iw_param *rts, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
short rtst;
int err;
@@ -1352,7 +1352,7 @@ static int zd1201_get_rts(struct net_device *dev, struct iw_request_info *info,
static int zd1201_set_frag(struct net_device *dev, struct iw_request_info *info,
struct iw_param *frag, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
int err;
short val = frag->value;
@@ -1373,7 +1373,7 @@ static int zd1201_set_frag(struct net_device *dev, struct iw_request_info *info,
static int zd1201_get_frag(struct net_device *dev, struct iw_request_info *info,
struct iw_param *frag, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
short fragt;
int err;
@@ -1402,7 +1402,7 @@ static int zd1201_get_retry(struct net_device *dev,
static int zd1201_set_encode(struct net_device *dev,
struct iw_request_info *info, struct iw_point *erq, char *key)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
short i;
int err, rid;
@@ -1459,7 +1459,7 @@ static int zd1201_set_encode(struct net_device *dev,
static int zd1201_get_encode(struct net_device *dev,
struct iw_request_info *info, struct iw_point *erq, char *key)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
short i;
int err;
@@ -1492,7 +1492,7 @@ static int zd1201_get_encode(struct net_device *dev,
static int zd1201_set_power(struct net_device *dev,
struct iw_request_info *info, struct iw_param *vwrq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
short enabled, duration, level;
int err;
@@ -1531,7 +1531,7 @@ out:
static int zd1201_get_power(struct net_device *dev,
struct iw_request_info *info, struct iw_param *vwrq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
short enabled, level, duration;
int err;
@@ -1618,7 +1618,7 @@ static const iw_handler zd1201_iw_handler[] =
static int zd1201_set_hostauth(struct net_device *dev,
struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
if (!zd->ap)
return -EOPNOTSUPP;
@@ -1629,7 +1629,7 @@ static int zd1201_set_hostauth(struct net_device *dev,
static int zd1201_get_hostauth(struct net_device *dev,
struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
short hostauth;
int err;
@@ -1648,7 +1648,7 @@ static int zd1201_get_hostauth(struct net_device *dev,
static int zd1201_auth_sta(struct net_device *dev,
struct iw_request_info *info, struct sockaddr *sta, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
unsigned char buffer[10];
if (!zd->ap)
@@ -1664,7 +1664,7 @@ static int zd1201_auth_sta(struct net_device *dev,
static int zd1201_set_maxassoc(struct net_device *dev,
struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
int err;
if (!zd->ap)
@@ -1679,7 +1679,7 @@ static int zd1201_set_maxassoc(struct net_device *dev,
static int zd1201_get_maxassoc(struct net_device *dev,
struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
- struct zd1201 *zd = (struct zd1201 *)dev->priv;
+ struct zd1201 *zd = netdev_priv(dev);
short maxassoc;
int err;
@@ -1731,6 +1731,7 @@ static int zd1201_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct zd1201 *zd;
+ struct net_device *dev;
struct usb_device *usb;
int err;
short porttype;
@@ -1738,9 +1739,12 @@ static int zd1201_probe(struct usb_interface *interface,
usb = interface_to_usbdev(interface);
- zd = kzalloc(sizeof(struct zd1201), GFP_KERNEL);
- if (!zd)
+ dev = alloc_etherdev(sizeof(*zd));
+ if (!dev)
return -ENOMEM;
+ zd = netdev_priv(dev);
+ zd->dev = dev;
+
zd->ap = ap;
zd->usb = usb;
zd->removed = 0;
@@ -1775,34 +1779,29 @@ static int zd1201_probe(struct usb_interface *interface,
if (err)
goto err_start;
- zd->dev = alloc_etherdev(0);
- if (!zd->dev)
- goto err_start;
-
- zd->dev->priv = zd;
- zd->dev->open = zd1201_net_open;
- zd->dev->stop = zd1201_net_stop;
- zd->dev->get_stats = zd1201_get_stats;
- zd->dev->wireless_handlers =
+ dev->open = zd1201_net_open;
+ dev->stop = zd1201_net_stop;
+ dev->get_stats = zd1201_get_stats;
+ dev->wireless_handlers =
(struct iw_handler_def *)&zd1201_iw_handlers;
- zd->dev->hard_start_xmit = zd1201_hard_start_xmit;
- zd->dev->watchdog_timeo = ZD1201_TX_TIMEOUT;
- zd->dev->tx_timeout = zd1201_tx_timeout;
- zd->dev->set_multicast_list = zd1201_set_multicast;
- zd->dev->set_mac_address = zd1201_set_mac_address;
- strcpy(zd->dev->name, "wlan%d");
+ dev->hard_start_xmit = zd1201_hard_start_xmit;
+ dev->watchdog_timeo = ZD1201_TX_TIMEOUT;
+ dev->tx_timeout = zd1201_tx_timeout;
+ dev->set_multicast_list = zd1201_set_multicast;
+ dev->set_mac_address = zd1201_set_mac_address;
+ strcpy(dev->name, "wlan%d");
err = zd1201_getconfig(zd, ZD1201_RID_CNFOWNMACADDR,
- zd->dev->dev_addr, zd->dev->addr_len);
+ dev->dev_addr, dev->addr_len);
if (err)
- goto err_net;
+ goto err_start;
/* Set wildcard essid to match zd->essid */
*(__le16 *)buf = cpu_to_le16(0);
err = zd1201_setconfig(zd, ZD1201_RID_CNFDESIREDSSID, buf,
IW_ESSID_MAX_SIZE+2, 1);
if (err)
- goto err_net;
+ goto err_start;
if (zd->ap)
porttype = ZD1201_PORTTYPE_AP;
@@ -1810,30 +1809,28 @@ static int zd1201_probe(struct usb_interface *interface,
porttype = ZD1201_PORTTYPE_BSS;
err = zd1201_setconfig16(zd, ZD1201_RID_CNFPORTTYPE, porttype);
if (err)
- goto err_net;
+ goto err_start;
- SET_NETDEV_DEV(zd->dev, &usb->dev);
+ SET_NETDEV_DEV(dev, &usb->dev);
- err = register_netdev(zd->dev);
+ err = register_netdev(dev);
if (err)
- goto err_net;
+ goto err_start;
dev_info(&usb->dev, "%s: ZD1201 USB Wireless interface\n",
- zd->dev->name);
+ dev->name);
usb_set_intfdata(interface, zd);
zd1201_enable(zd); /* zd1201 likes to startup enabled, */
zd1201_disable(zd); /* interfering with all the wifis in range */
return 0;
-err_net:
- free_netdev(zd->dev);
err_start:
/* Leave the device in reset state */
zd1201_docmd(zd, ZD1201_CMDCODE_INIT, 0, 0, 0);
err_zd:
usb_free_urb(zd->tx_urb);
usb_free_urb(zd->rx_urb);
- kfree(zd);
+ free_netdev(dev);
return err;
}
--
1.5.4.3
On Fri, 31 Oct 2008 14:48:16 -0400
"John W. Linville" <[email protected]> wrote:
> We have some reasons to kill netdev->priv:
> 1. netdev->priv is equal to netdev_priv().
> 2. netdev_priv() wraps the calculation of netdev->priv's offset, obviously
> netdev_priv() is more flexible than netdev->priv.
> But we cann't kill netdev->priv, because so many drivers reference to it
> directly.
>
> OK, becasue Dave S. Miller said, "every direct netdev->priv usage is a bug",
> and I want to kill netdev->priv later, I decided to convert all the direct
> reference of netdev->priv first.
>
> (Original patch posted by Wang Chen <[email protected]> w/ above
> changelog but using dev->ml_priv. That doesn't seem appropriate
> to me for this driver, so I've revamped it to use netdev_priv()
> instead. -- JWL)
>
> Cc: Wang Chen <[email protected]>
> Signed-off-by: John W. Linville <[email protected]>
> ---
> drivers/net/wireless/zd1201.c | 115 ++++++++++++++++++++---------------------
> 1 files changed, 56 insertions(+), 59 deletions(-)
>
> diff --git a/drivers/net/wireless/zd1201.c b/drivers/net/wireless/zd1201.c
> index b16ec6e..1652d67 100644
> --- a/drivers/net/wireless/zd1201.c
> +++ b/drivers/net/wireless/zd1201.c
> @@ -745,7 +745,7 @@ static int zd1201_join(struct zd1201 *zd, char *essid, int essidlen)
>
> static int zd1201_net_open(struct net_device *dev)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
>
> /* Start MAC with wildcard if no essid set */
> if (!zd->mac_enabled)
> @@ -783,7 +783,7 @@ static int zd1201_net_stop(struct net_device *dev)
> */
> static int zd1201_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> unsigned char *txbuf = zd->txdata;
> int txbuflen, pad = 0, err;
> struct urb *urb = zd->tx_urb;
> @@ -833,7 +833,7 @@ static int zd1201_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
>
> static void zd1201_tx_timeout(struct net_device *dev)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
>
> if (!zd)
> return;
> @@ -848,7 +848,7 @@ static void zd1201_tx_timeout(struct net_device *dev)
> static int zd1201_set_mac_address(struct net_device *dev, void *p)
> {
> struct sockaddr *addr = p;
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> int err;
>
> if (!zd)
> @@ -865,21 +865,21 @@ static int zd1201_set_mac_address(struct net_device *dev, void *p)
>
> static struct net_device_stats *zd1201_get_stats(struct net_device *dev)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
>
> return &zd->stats;
> }
>
> static struct iw_statistics *zd1201_get_wireless_stats(struct net_device *dev)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
>
> return &zd->iwstats;
> }
>
> static void zd1201_set_multicast(struct net_device *dev)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> struct dev_mc_list *mc = dev->mc_list;
> unsigned char reqbuf[ETH_ALEN*ZD1201_MAXMULTI];
> int i;
> @@ -899,7 +899,7 @@ static void zd1201_set_multicast(struct net_device *dev)
> static int zd1201_config_commit(struct net_device *dev,
> struct iw_request_info *info, struct iw_point *data, char *essid)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
>
> return zd1201_mac_reset(zd);
> }
> @@ -914,7 +914,7 @@ static int zd1201_get_name(struct net_device *dev,
> static int zd1201_set_freq(struct net_device *dev,
> struct iw_request_info *info, struct iw_freq *freq, char *extra)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> short channel = 0;
> int err;
>
> @@ -939,7 +939,7 @@ static int zd1201_set_freq(struct net_device *dev,
> static int zd1201_get_freq(struct net_device *dev,
> struct iw_request_info *info, struct iw_freq *freq, char *extra)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> short channel;
> int err;
>
> @@ -955,7 +955,7 @@ static int zd1201_get_freq(struct net_device *dev,
> static int zd1201_set_mode(struct net_device *dev,
> struct iw_request_info *info, __u32 *mode, char *extra)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> short porttype, monitor = 0;
> unsigned char buffer[IW_ESSID_MAX_SIZE+2];
> int err;
> @@ -1017,7 +1017,7 @@ static int zd1201_set_mode(struct net_device *dev,
> static int zd1201_get_mode(struct net_device *dev,
> struct iw_request_info *info, __u32 *mode, char *extra)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> short porttype;
> int err;
>
> @@ -1093,7 +1093,7 @@ static int zd1201_get_range(struct net_device *dev,
> static int zd1201_get_wap(struct net_device *dev,
> struct iw_request_info *info, struct sockaddr *ap_addr, char *extra)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> unsigned char buffer[6];
>
> if (!zd1201_getconfig(zd, ZD1201_RID_COMMSQUALITY, buffer, 6)) {
> @@ -1121,7 +1121,7 @@ static int zd1201_set_scan(struct net_device *dev,
> static int zd1201_get_scan(struct net_device *dev,
> struct iw_request_info *info, struct iw_point *srq, char *extra)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> int err, i, j, enabled_save;
> struct iw_event iwe;
> char *cev = extra;
> @@ -1213,7 +1213,7 @@ static int zd1201_get_scan(struct net_device *dev,
> static int zd1201_set_essid(struct net_device *dev,
> struct iw_request_info *info, struct iw_point *data, char *essid)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
>
> if (data->length > IW_ESSID_MAX_SIZE)
> return -EINVAL;
> @@ -1228,7 +1228,7 @@ static int zd1201_set_essid(struct net_device *dev,
> static int zd1201_get_essid(struct net_device *dev,
> struct iw_request_info *info, struct iw_point *data, char *essid)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
>
> memcpy(essid, zd->essid, zd->essidlen);
> data->flags = 1;
> @@ -1249,7 +1249,7 @@ static int zd1201_get_nick(struct net_device *dev, struct iw_request_info *info,
> static int zd1201_set_rate(struct net_device *dev,
> struct iw_request_info *info, struct iw_param *rrq, char *extra)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> short rate;
> int err;
>
> @@ -1282,7 +1282,7 @@ static int zd1201_set_rate(struct net_device *dev,
> static int zd1201_get_rate(struct net_device *dev,
> struct iw_request_info *info, struct iw_param *rrq, char *extra)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> short rate;
> int err;
>
> @@ -1315,7 +1315,7 @@ static int zd1201_get_rate(struct net_device *dev,
> static int zd1201_set_rts(struct net_device *dev, struct iw_request_info *info,
> struct iw_param *rts, char *extra)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> int err;
> short val = rts->value;
>
> @@ -1335,7 +1335,7 @@ static int zd1201_set_rts(struct net_device *dev, struct iw_request_info *info,
> static int zd1201_get_rts(struct net_device *dev, struct iw_request_info *info,
> struct iw_param *rts, char *extra)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> short rtst;
> int err;
>
> @@ -1352,7 +1352,7 @@ static int zd1201_get_rts(struct net_device *dev, struct iw_request_info *info,
> static int zd1201_set_frag(struct net_device *dev, struct iw_request_info *info,
> struct iw_param *frag, char *extra)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> int err;
> short val = frag->value;
>
> @@ -1373,7 +1373,7 @@ static int zd1201_set_frag(struct net_device *dev, struct iw_request_info *info,
> static int zd1201_get_frag(struct net_device *dev, struct iw_request_info *info,
> struct iw_param *frag, char *extra)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> short fragt;
> int err;
>
> @@ -1402,7 +1402,7 @@ static int zd1201_get_retry(struct net_device *dev,
> static int zd1201_set_encode(struct net_device *dev,
> struct iw_request_info *info, struct iw_point *erq, char *key)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> short i;
> int err, rid;
>
> @@ -1459,7 +1459,7 @@ static int zd1201_set_encode(struct net_device *dev,
> static int zd1201_get_encode(struct net_device *dev,
> struct iw_request_info *info, struct iw_point *erq, char *key)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> short i;
> int err;
>
> @@ -1492,7 +1492,7 @@ static int zd1201_get_encode(struct net_device *dev,
> static int zd1201_set_power(struct net_device *dev,
> struct iw_request_info *info, struct iw_param *vwrq, char *extra)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> short enabled, duration, level;
> int err;
>
> @@ -1531,7 +1531,7 @@ out:
> static int zd1201_get_power(struct net_device *dev,
> struct iw_request_info *info, struct iw_param *vwrq, char *extra)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> short enabled, level, duration;
> int err;
>
> @@ -1618,7 +1618,7 @@ static const iw_handler zd1201_iw_handler[] =
> static int zd1201_set_hostauth(struct net_device *dev,
> struct iw_request_info *info, struct iw_param *rrq, char *extra)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
>
> if (!zd->ap)
> return -EOPNOTSUPP;
> @@ -1629,7 +1629,7 @@ static int zd1201_set_hostauth(struct net_device *dev,
> static int zd1201_get_hostauth(struct net_device *dev,
> struct iw_request_info *info, struct iw_param *rrq, char *extra)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> short hostauth;
> int err;
>
> @@ -1648,7 +1648,7 @@ static int zd1201_get_hostauth(struct net_device *dev,
> static int zd1201_auth_sta(struct net_device *dev,
> struct iw_request_info *info, struct sockaddr *sta, char *extra)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> unsigned char buffer[10];
>
> if (!zd->ap)
> @@ -1664,7 +1664,7 @@ static int zd1201_auth_sta(struct net_device *dev,
> static int zd1201_set_maxassoc(struct net_device *dev,
> struct iw_request_info *info, struct iw_param *rrq, char *extra)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> int err;
>
> if (!zd->ap)
> @@ -1679,7 +1679,7 @@ static int zd1201_set_maxassoc(struct net_device *dev,
> static int zd1201_get_maxassoc(struct net_device *dev,
> struct iw_request_info *info, struct iw_param *rrq, char *extra)
> {
> - struct zd1201 *zd = (struct zd1201 *)dev->priv;
> + struct zd1201 *zd = netdev_priv(dev);
> short maxassoc;
> int err;
>
> @@ -1731,6 +1731,7 @@ static int zd1201_probe(struct usb_interface *interface,
> const struct usb_device_id *id)
> {
> struct zd1201 *zd;
> + struct net_device *dev;
> struct usb_device *usb;
> int err;
> short porttype;
> @@ -1738,9 +1739,12 @@ static int zd1201_probe(struct usb_interface *interface,
>
> usb = interface_to_usbdev(interface);
>
> - zd = kzalloc(sizeof(struct zd1201), GFP_KERNEL);
> - if (!zd)
> + dev = alloc_etherdev(sizeof(*zd));
> + if (!dev)
> return -ENOMEM;
> + zd = netdev_priv(dev);
> + zd->dev = dev;
This also fixes a bug where the driver would crash if sysfs files were open
when module was removed. See Documentation/networking/driver.txt
John W. Linville said the following on 2008-11-1 2:48:
> We have some reasons to kill netdev->priv:
> 1. netdev->priv is equal to netdev_priv().
> 2. netdev_priv() wraps the calculation of netdev->priv's offset, obviously
> netdev_priv() is more flexible than netdev->priv.
> But we cann't kill netdev->priv, because so many drivers reference to it
> directly.
>
> OK, becasue Dave S. Miller said, "every direct netdev->priv usage is a bug",
> and I want to kill netdev->priv later, I decided to convert all the direct
> reference of netdev->priv first.
>
> (Original patch posted by Wang Chen <[email protected]> w/ above
> changelog but using dev->ml_priv. That doesn't seem appropriate
> to me for this driver, so I've revamped it to use netdev_priv()
> instead. -- JWL)
>
> Cc: Wang Chen <[email protected]>
> Signed-off-by: John W. Linville <[email protected]>
> ---
> drivers/net/wireless/zd1201.c | 115 ++++++++++++++++++++---------------------
> 1 files changed, 56 insertions(+), 59 deletions(-)
>
snip...
> @@ -1731,6 +1731,7 @@ static int zd1201_probe(struct usb_interface *interface,
> const struct usb_device_id *id)
> {
> struct zd1201 *zd;
> + struct net_device *dev;
> struct usb_device *usb;
> int err;
> short porttype;
> @@ -1738,9 +1739,12 @@ static int zd1201_probe(struct usb_interface *interface,
>
> usb = interface_to_usbdev(interface);
>
> - zd = kzalloc(sizeof(struct zd1201), GFP_KERNEL);
> - if (!zd)
> + dev = alloc_etherdev(sizeof(*zd));
> + if (!dev)
> return -ENOMEM;
> + zd = netdev_priv(dev);
> + zd->dev = dev;
> +
It's ok to me.
Reviewed-by: Wang Chen <[email protected]>
| commit 3d29b0c33d431ecc69ec778f8c236d382f59a85f
| Author: John W. Linville <[email protected]>
| Date: Fri Oct 31 14:13:12 2008 -0400
|
| netdevice zd1201: Convert directly reference of netdev->priv to netdev_priv()
|
| We have some reasons to kill netdev->priv:
| 1. netdev->priv is equal to netdev_priv().
| 2. netdev_priv() wraps the calculation of netdev->priv's offset, obviously
| netdev_priv() is more flexible than netdev->priv.
| But we cann't kill netdev->priv, because so many drivers reference to it
| directly.
|
| OK, becasue Dave S. Miller said, "every direct netdev->priv usage is a bug",
| and I want to kill netdev->priv later, I decided to convert all the direct
| reference of netdev->priv first.
|
| (Original patch posted by Wang Chen <[email protected]> w/ above
| changelog but using dev->ml_priv. That doesn't seem appropriate
| to me for this driver, so I've revamped it to use netdev_priv()
| instead. -- JWL)
This commit changed the allocation of netdev, but didn't change
the free method of it.
This causes "zd" be used after the memory, which is pointed by "zd", being
freed by free_netdev().
Signed-off-by: Wang Chen <[email protected]>
Cc: John W. Linville <[email protected]>
---
drivers/net/wireless/zd1201.c | 10 +++++-----
1 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/net/wireless/zd1201.c b/drivers/net/wireless/zd1201.c
index 3404807..b45c27d 100644
--- a/drivers/net/wireless/zd1201.c
+++ b/drivers/net/wireless/zd1201.c
@@ -1841,10 +1841,6 @@ static void zd1201_disconnect(struct usb_interface *interface)
if (!zd)
return;
usb_set_intfdata(interface, NULL);
- if (zd->dev) {
- unregister_netdev(zd->dev);
- free_netdev(zd->dev);
- }
hlist_for_each_entry_safe(frag, node, node2, &zd->fraglist, fnode) {
hlist_del_init(&frag->fnode);
@@ -1860,7 +1856,11 @@ static void zd1201_disconnect(struct usb_interface *interface)
usb_kill_urb(zd->rx_urb);
usb_free_urb(zd->rx_urb);
}
- kfree(zd);
+
+ if (zd->dev) {
+ unregister_netdev(zd->dev);
+ free_netdev(zd->dev);
+ }
}
#ifdef CONFIG_PM
--
1.5.3.4
On Thu, Dec 18, 2008 at 02:53:31PM +0800, Wang Chen wrote:
> | commit 3d29b0c33d431ecc69ec778f8c236d382f59a85f
> | Author: John W. Linville <[email protected]>
> | Date: Fri Oct 31 14:13:12 2008 -0400
> |
> | netdevice zd1201: Convert directly reference of netdev->priv to netdev_priv()
> |
> | We have some reasons to kill netdev->priv:
> | 1. netdev->priv is equal to netdev_priv().
> | 2. netdev_priv() wraps the calculation of netdev->priv's offset, obviously
> | netdev_priv() is more flexible than netdev->priv.
> | But we cann't kill netdev->priv, because so many drivers reference to it
> | directly.
> |
> | OK, becasue Dave S. Miller said, "every direct netdev->priv usage is a bug",
> | and I want to kill netdev->priv later, I decided to convert all the direct
> | reference of netdev->priv first.
> |
> | (Original patch posted by Wang Chen <[email protected]> w/ above
> | changelog but using dev->ml_priv. That doesn't seem appropriate
> | to me for this driver, so I've revamped it to use netdev_priv()
> | instead. -- JWL)
>
> This commit changed the allocation of netdev, but didn't change
> the free method of it.
> This causes "zd" be used after the memory, which is pointed by "zd", being
> freed by free_netdev().
Oops...thanks!
John
--
John W. Linville Linux should be at the core
[email protected] of your literate lifestyle.
From: Wang Chen <[email protected]>
Date: Thu, 18 Dec 2008 14:53:31 +0800
> | commit 3d29b0c33d431ecc69ec778f8c236d382f59a85f
> | Author: John W. Linville <[email protected]>
> | Date: Fri Oct 31 14:13:12 2008 -0400
> |
> | netdevice zd1201: Convert directly reference of netdev->priv to netdev_priv()
...
>
> This commit changed the allocation of netdev, but didn't change
> the free method of it.
> This causes "zd" be used after the memory, which is pointed by "zd", being
> freed by free_netdev().
>
> Signed-off-by: Wang Chen <[email protected]>
Patch applied to net-next-2.6, thanks!