linux-kernel - Re: [PATCH] rfkill: fix deadlock in rfkill_send

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Date:   Sat, 14 Oct 2023 10:43:22 +0800
From:   Edward AD <twuufnxlz@...il.com>
To:     horms@...nel.org
Cc:     davem@...emloft.net, edumazet@...gle.com, johannes.berg@...el.com,
        johannes@...solutions.net, kuba@...nel.org,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, pabeni@...hat.com,
        syzbot+509238e523e032442b80@...kaller.appspotmail.com,
        syzkaller-bugs@...glegroups.com, twuufnxlz@...il.com
Subject: Re: [PATCH] rfkill: fix deadlock in rfkill_send_events

Hi Simon Horman,
On Fri, 13 Oct 2023 13:06:38 +0200, Simon Horman wrote:
> I am wondering if you considered moving the rfkill_sync() calls
> to before &data->mtx is taken, to avoid the need to drop and
> retake it?
If you move rfkill_sync() before calling &data->mtx, more code will be added 
because rfkill_sync() is in the loop body.
> 
> Perhaps it doesn't work for some reason (compile tested only!).
> But this does seem somehow cleaner for me.
BR,
edward