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staging/wlan-ng, prism2usb: replace completion_bh tasklet with work

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Tasklets have long been deprecated as being too heavy on the system
by running in irq context - and this is not a performance critical
path. If a higher priority process wants to run, it must wait for
the tasklet to finish before doing so.

The completion_bh tasklet will now run in process context and have
further concurrency (tasklets being serialized among themselves),
but this is done holding the ctlxq.lock, so it should be fine.

Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
Link: https://lore.kernel.org/r/20220411151620.129178-4-dave@stgolabs.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Davidlohr Bueso 2022-04-11 08:16:17 -07:00 committed by Greg Kroah-Hartman
parent cbe0f674a2
commit 9442e81d7e
3 changed files with 15 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/staging/wlan-ng/hfa384x.h
View File

@ -1228,7 +1228,7 @@ struct hfa384x {
struct timer_list throttle;
struct work_struct reaper_bh;
struct tasklet_struct completion_bh;
struct work_struct completion_bh;
struct work_struct usb_work;

22
drivers/staging/wlan-ng/hfa384x_usb.c
View File

@ -191,7 +191,7 @@ static void hfa384x_usbctlx_resptimerfn(struct timer_list *t);
static void hfa384x_usb_throttlefn(struct timer_list *t);
static void hfa384x_usbctlx_completion_task(struct tasklet_struct *t);
static void hfa384x_usbctlx_completion_task(struct work_struct *work);
static void hfa384x_usbctlx_reaper_task(struct work_struct *work);
@ -540,7 +540,7 @@ void hfa384x_create(struct hfa384x *hw, struct usb_device *usb)
skb_queue_head_init(&hw->authq);
INIT_WORK(&hw->reaper_bh, hfa384x_usbctlx_reaper_task);
tasklet_setup(&hw->completion_bh, hfa384x_usbctlx_completion_task);
INIT_WORK(&hw->completion_bh, hfa384x_usbctlx_completion_task);
INIT_WORK(&hw->link_bh, prism2sta_processing_defer);
INIT_WORK(&hw->usb_work, hfa384x_usb_defer);
@ -2585,10 +2585,10 @@ void hfa384x_tx_timeout(struct wlandevice *wlandev)
/*----------------------------------------------------------------
* hfa384x_usbctlx_reaper_task
*
* Deferred work to delete dead CTLX objects
* Deferred work callback to delete dead CTLX objects
*
* Arguments:
* data ptr to a struct hfa384x
* work contains ptr to a struct hfa384x
*
* Returns:
*
@ -2618,21 +2618,21 @@ static void hfa384x_usbctlx_reaper_task(struct work_struct *work)
/*----------------------------------------------------------------
* hfa384x_usbctlx_completion_task
*
* Tasklet to call completion handlers for returned CTLXs
* Deferred work callback to call completion handlers for returned CTLXs
*
* Arguments:
* data ptr to struct hfa384x
* work contains ptr to a struct hfa384x
*
* Returns:
* Nothing
*
* Call context:
* Interrupt
* Task
*----------------------------------------------------------------
*/
static void hfa384x_usbctlx_completion_task(struct tasklet_struct *t)
static void hfa384x_usbctlx_completion_task(struct work_struct *work)
{
struct hfa384x *hw = from_tasklet(hw, t, completion_bh);
struct hfa384x *hw = container_of(work, struct hfa384x, reaper_bh);
struct hfa384x_usbctlx *ctlx, *temp;
unsigned long flags;
@ -2743,7 +2743,7 @@ static int unlocked_usbctlx_cancel_async(struct hfa384x *hw,
* aren't active and the timers should have been stopped.
*
* The CTLX is migrated to the "completing" queue, and the completing
* tasklet is scheduled.
* work is scheduled.
*
* Arguments:
* hw ptr to a struct hfa384x structure
@ -2766,7 +2766,7 @@ static void unlocked_usbctlx_complete(struct hfa384x *hw,
* queue.
*/
list_move_tail(&ctlx->list, &hw->ctlxq.completing);
tasklet_schedule(&hw->completion_bh);
schedule_work(&hw->completion_bh);
switch (ctlx->state) {
case CTLX_COMPLETE:

6
drivers/staging/wlan-ng/prism2usb.c
View File

@ -165,8 +165,8 @@ static void prism2sta_disconnect_usb(struct usb_interface *interface)
spin_unlock_irqrestore(&hw->ctlxq.lock, flags);
/* There's no hardware to shutdown, but the driver
* might have some tasks or tasklets that must be
* stopped before we can tear everything down.
* might have some tasks that must be stopped before
* we can tear everything down.
*/
prism2sta_ifstate(wlandev, P80211ENUM_ifstate_disable);
@ -181,7 +181,7 @@ static void prism2sta_disconnect_usb(struct usb_interface *interface)
usb_kill_urb(&hw->tx_urb);
usb_kill_urb(&hw->ctlx_urb);
tasklet_kill(&hw->completion_bh);
cancel_work_sync(&hw->completion_bh);
cancel_work_sync(&hw->reaper_bh);
cancel_work_sync(&hw->link_bh);