Messages in this thread Patch in this message | | | From | Xiaotian Feng <> | Subject | [PATCH] staging: ozwpan: use tasklet_kill in device remove/release process | Date | Wed, 31 Oct 2012 18:56:48 +0800 |
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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> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: devel@driverdev.osuosl.org --- drivers/staging/ozwpan/ozhcd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/ozwpan/ozhcd.c b/drivers/staging/ozwpan/ozhcd.c index 2e087ac..33c0009 100644 --- 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)); -- 1.7.9.5
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