linux-kernel - Re: [Patch v6] i2c: pnx: Fix potential deadlock warning from del_timer

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Message-ID: <cvpj5q2laopscchvwvndrl247tlkgyw7tw7nnpuevcs4g5qf52@hpruhtety5lt>
Date: Thu, 4 Jul 2024 00:21:03 +0200
From: Andi Shyti <andi.shyti@...nel.org>
To: Piotr Wojtaszczyk <piotr.wojtaszczyk@...esys.com>
Cc: Vladimir Zapolskiy <vz@...ia.com>, 
	linux-arm-kernel@...ts.infradead.org, linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Patch v6] i2c: pnx: Fix potential deadlock warning from
 del_timer_sync() call in isr

Hi Piotr,

On Thu, Jul 04, 2024 at 12:19:38AM GMT, Andi Shyti wrote:
> Hi Piotr,
> 
> On Tue, Jul 02, 2024 at 11:13:06AM GMT, Piotr Wojtaszczyk wrote:
> > On Tue, Jul 2, 2024 at 1:01 AM Andi Shyti <andi.shyti@...nel.org> wrote:
> > > > @@ -653,7 +624,10 @@ static int i2c_pnx_probe(struct platform_device *pdev)
> > > >       alg_data->adapter.algo_data = alg_data;
> > > >       alg_data->adapter.nr = pdev->id;
> > > >
> > > > -     alg_data->timeout = I2C_PNX_TIMEOUT_DEFAULT;
> > > > +     alg_data->timeout = msecs_to_jiffies(I2C_PNX_TIMEOUT_DEFAULT);
> > > > +     if (alg_data->timeout <= 1)
> > > > +             alg_data->timeout = 2;
> > >
> > > I don't see the need for this check. The default timeout is
> > > defined as 10.
> > >
> > > Thanks,
> > > Andi
> > 
> > That's the timeout value which was in the previous timer in i2c_pnx_arm_timer(),
> > without this I had time out events.
> 
> I meant the if() statement. We are sure timeout is not <= 1 at
> this point.
> 
> Anyway, it doesn't matter. I applied the patch in
> i2c/i2c-host-next.

Sorry, applied to i2c/i2c-host-fixes on

git://git.kernel.org/pub/scm/linux/kernel/git/andi.shyti/linux.git

Thank you,
Andi

Patches applied
===============
[1/1] i2c: pnx: Fix potential deadlock warning from del_timer_sync() call in isr
      commit: f63b94be6942ba82c55343e196bd09b53227618e