2024-03-07 09:40:11

by yangxingui

Subject: [PATCH v3 2/3] scsi: libsas: Add a helper sas_get_sas_addr_and_dev_type()

Add a helper to get attached_sas_addr and device type from disc_resp.

Suggested-by: John Garry <[email protected]>
Signed-off-by: Xingui Yang <[email protected]>
---
drivers/scsi/libsas/sas_expander.c | 19 ++++++++++++-------
1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 1eeb69cba8da..d6147616339f 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -1631,6 +1631,16 @@ int sas_discover_root_expander(struct domain_device *dev)

/* ---------- Domain revalidation ---------- */

+static void sas_get_sas_addr_and_dev_type(struct smp_disc_resp *disc_resp,
+ u8 *sas_addr,
+ enum sas_device_type *type)
+{
+ memcpy(sas_addr, disc_resp->disc.attached_sas_addr, SAS_ADDR_SIZE);
+ *type = to_dev_type(&disc_resp->disc);
+ if (*type == SAS_PHY_UNUSED)
+ memset(sas_addr, 0, SAS_ADDR_SIZE);
+}
+
static int sas_get_phy_discover(struct domain_device *dev,
int phy_id, struct smp_disc_resp *disc_resp)
{
@@ -1684,13 +1694,8 @@ int sas_get_phy_attached_dev(struct domain_device *dev, int phy_id,
return -ENOMEM;

res = sas_get_phy_discover(dev, phy_id, disc_resp);
- if (res == 0) {
- memcpy(sas_addr, disc_resp->disc.attached_sas_addr,
- SAS_ADDR_SIZE);
- *type = to_dev_type(&disc_resp->disc);
- if (*type == 0)
- memset(sas_addr, 0, SAS_ADDR_SIZE);
- }
+ if (res == 0)
+ sas_get_sas_addr_and_dev_type(disc_resp, sas_addr, type);
kfree(disc_resp);
return res;
}
--
2.17.1

2024-03-07 10:09:35

by John Garry

Subject: Re: [PATCH v3 2/3] scsi: libsas: Add a helper sas_get_sas_addr_and_dev_type()

On 07/03/2024 09:37, Xingui Yang wrote:
> Add a helper to get attached_sas_addr and device type from disc_resp.
>
> Suggested-by: John Garry <[email protected]>
> Signed-off-by: Xingui Yang <[email protected]>

Reviewed-by: John Garry <[email protected]>

> ---
> drivers/scsi/libsas/sas_expander.c | 19 ++++++++++++-------
> 1 file changed, 12 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
> index 1eeb69cba8da..d6147616339f 100644
> --- a/drivers/scsi/libsas/sas_expander.c
> +++ b/drivers/scsi/libsas/sas_expander.c
> @@ -1631,6 +1631,16 @@ int sas_discover_root_expander(struct domain_device *dev)
>
> /* ---------- Domain revalidation ---------- */
>
> +static void sas_get_sas_addr_and_dev_type(struct smp_disc_resp *disc_resp,
> + u8 *sas_addr,
> + enum sas_device_type *type)
> +{
> + memcpy(sas_addr, disc_resp->disc.attached_sas_addr, SAS_ADDR_SIZE);
> + *type = to_dev_type(&disc_resp->disc);
> + if (*type == SAS_PHY_UNUSED)
> + memset(sas_addr, 0, SAS_ADDR_SIZE);
> +}
> +
> static int sas_get_phy_discover(struct domain_device *dev,
> int phy_id, struct smp_disc_resp *disc_resp)
> {
> @@ -1684,13 +1694,8 @@ int sas_get_phy_attached_dev(struct domain_device *dev, int phy_id,
> return -ENOMEM;
>
> res = sas_get_phy_discover(dev, phy_id, disc_resp);

At some stage - I am not saying necessarily now! - it would be good to
stop this function returning both a linux error code and a SAS protocol
response code

> - if (res == 0) {
> - memcpy(sas_addr, disc_resp->disc.attached_sas_addr,
> - SAS_ADDR_SIZE);
> - *type = to_dev_type(&disc_resp->disc);
> - if (*type == 0)
> - memset(sas_addr, 0, SAS_ADDR_SIZE);
> - }
> + if (res == 0)
> + sas_get_sas_addr_and_dev_type(disc_resp, sas_addr, type);
> kfree(disc_resp);
> return res;
> }