linux-kernel - Re: [PATCH] drm/bridge: adv7511: fix race condition bug in adv7511

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Date:   Wed, 15 Mar 2023 17:20:28 +0800
From:   Zheng Hacker <hackerzheng666@...il.com>
To:     neil.armstrong@...aro.org
Cc:     Zheng Wang <zyytlz.wz@....com>, dri-devel@...ts.freedesktop.org,
        andrzej.hajda@...el.com, jonas@...boo.se, airlied@...il.com,
        daniel@...ll.ch, linux-kernel@...r.kernel.org,
        1395428693sheep@...il.com, alex000young@...il.com
Subject: Re: [PATCH] drm/bridge: adv7511: fix race condition bug in
 adv7511_remove due to unfinished work

<neil.armstrong@...aro.org> 于2023年3月15日周三 17:08写道：
>
> Hi,
>
> On 08/03/2023 18:34, Zheng Wang wrote:
> > In adv7511_probe, adv7511->hpd_work is bound with adv7511_hpd_work.
> > If we call adv7511_remove with a unfinished work. There may be a
> > race condition where bridge->hpd_mutex was destroyed by
> > drm_bridge_remove and used in adv7511_hpd_work in drm_bridge_hpd_notify.
> >
> > Fix it by canceling the work before cleanup in adv7511_remove.
> >
>
> Can you add the relevant Fixes tag ?
>

Hi Neil,

Thanks for your reply and kind reminder. Sorry for my mistake. I'll
append more messages in the next version of patch.

Best regards,
Zheng

> Thanks,
> Neil
>
> > Signed-off-by: Zheng Wang <zyytlz.wz@....com>
> > ---
> >   drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 1 +
> >   1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> > index ddceafa7b637..9bf72dd6c1d3 100644
> > --- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> > +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> > @@ -1349,6 +1349,7 @@ static void adv7511_remove(struct i2c_client *i2c)
> >   {
> >       struct adv7511 *adv7511 = i2c_get_clientdata(i2c);
> >
> > +     cancel_work_sync(&adv7511->hpd_work);
> >       adv7511_uninit_regulators(adv7511);
> >
> >       drm_bridge_remove(&adv7511->bridge);
>