staging: ozwpan: use tasklet_kill in device remove/release process

Some driver uses tasklet_disable in device remove/release process,
tasklet_disable will inc tasklet->count and return. If the tasklet
is not handled yet under some softirq pressure, the tasklet will be
placed on the tasklet_vec, never have a chance to be excuted. This might
lead to a heavy loaded ksoftirqd, wakeup with pending_softirq, but
tasklet is disabled. tasklet_kill should be used in this case.

Signed-off-by: Xiaotian Feng <dannyfeng@tencent.com>
Cc: Rupesh Gujare <rgujare@ozmodevices.com>
Cc: Chris Kelly <ckelly@ozmodevices.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/ozwpan/ozhcd.c b/drivers/staging/ozwpan/ozhcd.c
index 2e087acf1578998c292362093e68449d11766560..33c0009b30826f88a7774fdf972c2d68836735ec 100644 (file)
--- a/drivers/staging/ozwpan/ozhcd.c
+++ b/drivers/staging/ozwpan/ozhcd.c
@@ -2304,8 +2304,8 @@ error:
  */
 void oz_hcd_term(void)
 {
-       tasklet_disable(&g_urb_process_tasklet);
-       tasklet_disable(&g_urb_cancel_tasklet);
+       tasklet_kill(&g_urb_process_tasklet);
+       tasklet_kill(&g_urb_cancel_tasklet);
        platform_device_unregister(g_plat_dev);
        platform_driver_unregister(&g_oz_plat_drv);
        oz_trace("Pending urbs:%d\n", atomic_read(&g_pending_urbs));