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 <[email protected]>
Cc: Hansjoerg Lipp <[email protected]>
Cc: Tilman Schmidt <[email protected]>
Cc: Karsten Keil <[email protected]>
Cc: [email protected]
---
drivers/isdn/gigaset/interface.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/isdn/gigaset/interface.c b/drivers/isdn/gigaset/interface.c
index 67abf3f..284c7f3 100644
--- a/drivers/isdn/gigaset/interface.c
+++ b/drivers/isdn/gigaset/interface.c
@@ -544,7 +544,6 @@ void gigaset_if_free(struct cardstate *cs)
if (!drv->have_tty)
return;
- tasklet_disable(&cs->if_wake_tasklet);
tasklet_kill(&cs->if_wake_tasklet);
cs->tty_dev = NULL;
tty_unregister_device(drv->tty, cs->minor_index);
--
1.7.9.5
Am 31.10.2012 11:44, schrieb Xiaotian Feng:
> 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 <[email protected]>
> Cc: Hansjoerg Lipp <[email protected]>
> Cc: Tilman Schmidt <[email protected]>
> Cc: Karsten Keil <[email protected]>
> Cc: [email protected]
Acked-by: Tilman Schmidt <[email protected]>
> ---
> drivers/isdn/gigaset/interface.c | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/drivers/isdn/gigaset/interface.c b/drivers/isdn/gigaset/interface.c
> index 67abf3f..284c7f3 100644
> --- a/drivers/isdn/gigaset/interface.c
> +++ b/drivers/isdn/gigaset/interface.c
> @@ -544,7 +544,6 @@ void gigaset_if_free(struct cardstate *cs)
> if (!drv->have_tty)
> return;
>
> - tasklet_disable(&cs->if_wake_tasklet);
> tasklet_kill(&cs->if_wake_tasklet);
> cs->tty_dev = NULL;
> tty_unregister_device(drv->tty, cs->minor_index);
>
--
Tilman Schmidt E-Mail: [email protected]
Bonn, Germany
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