Re: [PATCH] USB: cdc-wdm: Fix ODEBUG bug in wdm_disconnect

[Oliver Neukum <oneukum@suse.com>]

Am Dienstag, den 11.05.2021, 14:48 +0900 schrieb Tetsuo Handa:
> On 2021/05/11 12:31, qiang.zhang@windriver.com wrote:
> > This warning is generated because when kfree wdm_device,
> > it is found that there is still an active work in workqueue,
> > This phenomenon may be due to the following reasons.
> > when the devices disconnect, although the work was cancelled,
> > but the schedule_work still may be called, therefore, before
> > scheduling work, we need to detect the status of the device.
> > 
> > Reported-by: syzbot <
> > syzbot+7da71853830ac3289474@syzkaller.appspotmail.com>
> > Signed-off-by: Zqiang <qiang.zhang@windriver.com>
> > ---
> >  drivers/usb/class/cdc-wdm.c | 13 ++++++++-----
> >  1 file changed, 8 insertions(+), 5 deletions(-)
> > 
> 
> Oliver Neukum is aware of this problem, and is considering poisoning
> approach than
> checking WDM_SUSPENDING/WDM_RESETTING/WDM_DISCONNECTING approach. I
> guess we could
> replace three test_bit() tests into OR'ed-bits test (something like
> test_bits()) ?
> 
>   
> https://lkml.kernel.org/r/2db36d52015b644cc1891fcffc87ef09c2b728b7.camel@suse.com
> 
> Oliver, how do we want to fix this problem?

Hi,

I was under the assumption that Greg had already merged the fix
18abf874367456540846319574864e6ff32752e2
Am I wrong?

	Regards
		Oliver