It is not necessary to hold the firmware memory during the whole
driver lifetime, and obviously it does waste memory. Suppose there
are 4 ath9k-htc usb dongles working, kernel has to consume about
4*50KBytes RAM to cache firmware for all dongles. After applying the
patch, kernel only caches one single firmware image in RAM for
all ath9k-htc devices just during system suspend/resume cycle.
When system is ready for loading firmware, ath9k-htc can request
the loading from usersapce. During system resume, ath9k-htc still
can load the firmware which was cached in kernel memory before
system suspend.
Cc: [email protected]
Cc: "Luis R. Rodriguez" <[email protected]>
Cc: Jouni Malinen <[email protected]>
Cc: Vasanthakumar Thiagarajan <[email protected]>
Cc: Senthil Balasubramanian <[email protected]>
Cc: "John W. Linville" <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
---
v1:
fix double free of firmware in failue path of
ath9k_hif_usb_firmware_cb
This patch(just behaviour instead of build) depends on firmware
cache patch set which has entered -next tree already via driver core
tree.
---
drivers/net/wireless/ath/ath9k/hif_usb.c | 33 ++++++++++++++++++++----------
drivers/net/wireless/ath/ath9k/hif_usb.h | 4 +++-
2 files changed, 25 insertions(+), 12 deletions(-)
diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.c b/drivers/net/wireless/ath/ath9k/hif_usb.c
index aa327ad..ee6e50a 100644
--- a/drivers/net/wireless/ath/ath9k/hif_usb.c
+++ b/drivers/net/wireless/ath/ath9k/hif_usb.c
@@ -973,8 +973,8 @@ static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev)
{
int transfer, err;
- const void *data = hif_dev->firmware->data;
- size_t len = hif_dev->firmware->size;
+ const void *data = hif_dev->fw_data;
+ size_t len = hif_dev->fw_size;
u32 addr = AR9271_FIRMWARE;
u8 *buf = kzalloc(4096, GFP_KERNEL);
u32 firm_offset;
@@ -1017,7 +1017,7 @@ static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev)
return -EIO;
dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
- hif_dev->fw_name, (unsigned long) hif_dev->firmware->size);
+ hif_dev->fw_name, (unsigned long) hif_dev->fw_size);
return 0;
}
@@ -1099,11 +1099,11 @@ static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context)
hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
&hif_dev->udev->dev);
- if (hif_dev->htc_handle == NULL) {
- goto err_fw;
- }
+ if (hif_dev->htc_handle == NULL)
+ goto err_dev_alloc;
- hif_dev->firmware = fw;
+ hif_dev->fw_data = fw->data;
+ hif_dev->fw_size = fw->size;
/* Proceed with initialization */
@@ -1121,6 +1121,8 @@ static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context)
goto err_htc_hw_init;
}
+ release_firmware(fw);
+ hif_dev->flags |= HIF_USB_READY;
complete(&hif_dev->fw_done);
return;
@@ -1129,8 +1131,8 @@ err_htc_hw_init:
ath9k_hif_usb_dev_deinit(hif_dev);
err_dev_init:
ath9k_htc_hw_free(hif_dev->htc_handle);
+err_dev_alloc:
release_firmware(fw);
- hif_dev->firmware = NULL;
err_fw:
ath9k_hif_usb_firmware_fail(hif_dev);
}
@@ -1277,11 +1279,10 @@ static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
wait_for_completion(&hif_dev->fw_done);
- if (hif_dev->firmware) {
+ if (hif_dev->flags & HIF_USB_READY) {
ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged);
ath9k_htc_hw_free(hif_dev->htc_handle);
ath9k_hif_usb_dev_deinit(hif_dev);
- release_firmware(hif_dev->firmware);
}
usb_set_intfdata(interface, NULL);
@@ -1317,13 +1318,23 @@ static int ath9k_hif_usb_resume(struct usb_interface *interface)
struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
struct htc_target *htc_handle = hif_dev->htc_handle;
int ret;
+ const struct firmware *fw;
ret = ath9k_hif_usb_alloc_urbs(hif_dev);
if (ret)
return ret;
- if (hif_dev->firmware) {
+ if (hif_dev->flags & HIF_USB_READY) {
+ /* request cached firmware during suspend/resume cycle */
+ ret = request_firmware(&fw, hif_dev->fw_name,
+ &hif_dev->udev->dev);
+ if (ret)
+ goto fail_resume;
+
+ hif_dev->fw_data = fw->data;
+ hif_dev->fw_size = fw->size;
ret = ath9k_hif_usb_download_fw(hif_dev);
+ release_firmware(fw);
if (ret)
goto fail_resume;
} else {
diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.h b/drivers/net/wireless/ath/ath9k/hif_usb.h
index 487ff65..51496e7 100644
--- a/drivers/net/wireless/ath/ath9k/hif_usb.h
+++ b/drivers/net/wireless/ath/ath9k/hif_usb.h
@@ -85,12 +85,14 @@ struct cmd_buf {
};
#define HIF_USB_START BIT(0)
+#define HIF_USB_READY BIT(1)
struct hif_device_usb {
struct usb_device *udev;
struct usb_interface *interface;
const struct usb_device_id *usb_device_id;
- const struct firmware *firmware;
+ const void *fw_data;
+ size_t fw_size;
struct completion fw_done;
struct htc_target *htc_handle;
struct hif_usb_tx tx;
--
1.7.9.5
Hi,
On Sat, Sep 1, 2012 at 10:41 AM, Ming Lei <[email protected]> wrote:
> On Tue, Aug 21, 2012 at 4:04 PM, Ming Lei <[email protected]> wrote:
>> It is not necessary to hold the firmware memory during the whole
>> driver lifetime, and obviously it does waste memory. Suppose there
>> are 4 ath9k-htc usb dongles working, kernel has to consume about
>> 4*50KBytes RAM to cache firmware for all dongles. After applying the
>> patch, kernel only caches one single firmware image in RAM for
>> all ath9k-htc devices just during system suspend/resume cycle.
>>
>> When system is ready for loading firmware, ath9k-htc can request
>> the loading from usersapce. During system resume, ath9k-htc still
>> can load the firmware which was cached in kernel memory before
>> system suspend.
>>
>> Cc: [email protected]
>> Cc: "Luis R. Rodriguez" <[email protected]>
>> Cc: Jouni Malinen <[email protected]>
>> Cc: Vasanthakumar Thiagarajan <[email protected]>
>> Cc: Senthil Balasubramanian <[email protected]>
>> Cc: "John W. Linville" <[email protected]>
>> Signed-off-by: Ming Lei <[email protected]>
>> ---
>> v1:
>> fix double free of firmware in failue path of
>> ath9k_hif_usb_firmware_cb
>
> Gentle ping, :-)
this patch is now in wireless-testing :-)
>
>
> Thanks,
> --
> Ming Lei
> --
> To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
> the body of a message to [email protected]
> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
thanks,
shafi
On Tue, Aug 21, 2012 at 4:04 PM, Ming Lei <[email protected]> wrote:
> It is not necessary to hold the firmware memory during the whole
> driver lifetime, and obviously it does waste memory. Suppose there
> are 4 ath9k-htc usb dongles working, kernel has to consume about
> 4*50KBytes RAM to cache firmware for all dongles. After applying the
> patch, kernel only caches one single firmware image in RAM for
> all ath9k-htc devices just during system suspend/resume cycle.
>
> When system is ready for loading firmware, ath9k-htc can request
> the loading from usersapce. During system resume, ath9k-htc still
> can load the firmware which was cached in kernel memory before
> system suspend.
>
> Cc: [email protected]
> Cc: "Luis R. Rodriguez" <[email protected]>
> Cc: Jouni Malinen <[email protected]>
> Cc: Vasanthakumar Thiagarajan <[email protected]>
> Cc: Senthil Balasubramanian <[email protected]>
> Cc: "John W. Linville" <[email protected]>
> Signed-off-by: Ming Lei <[email protected]>
> ---
> v1:
> fix double free of firmware in failue path of
> ath9k_hif_usb_firmware_cb
Gentle ping, :-)
Thanks,
--
Ming Lei