Re: [REGRESSION/bisected] kernel panic after "rmmod cx23885" by "si2157: implement signal strength stats"

[Antti Palosaari <crope@iki.fi>]

Hello
Those timers are activated on frontend init() ja de-activated on 
sleep(). Removing active driver does not sound good and IMHO it should 
not be even possible. I think it should be find out why it is possible 
to remove whole driver before it is put to sleep().

Antti


On 01/09/2016 11:42 PM, Ernst Martin Witte wrote:
> Hi again,
>
> seems  that the  cause  for the  kernel  panic is  a  missing call  to
> cancel_delayed_work_sync in  si2157_remove before  the call  to kfree.
> After adding cancel_delayed_work_sync(&dev->stat_work), rmmod does not
> trigger the kernel panic any more.
>
> However, very similar issues could be identified also in other modules:
>
>     ts2020
>     af9013
>     af9033
>     rtl2830
>
> when looking in drivers/media/tuners and drivers/media/dvb-frontends.
>
> Therefore,  the submitted  patch  set contains  fixes  also for  those
> modules. The submitted patch set is:
>
>     [PATCH 0/5] [media] cancel_delayed_work_sync before device removal / kfree
>
> I hope these patches completely fix the issue and are ok for inclusion
> in the kernel.
>
> BR and thx,
>     Martin
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