linux-kernel - Re: [Patch v5 12/12] i2x: pnx: Fix potential deadlock warning from del_timer

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Date: Fri, 28 Jun 2024 09:48:29 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Piotr Wojtaszczyk <piotr.wojtaszczyk@...esys.com>,
 Vinod Koul <vkoul@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, "J.M.B. Downing" <jonathan.downing@...tel.com>,
 Vladimir Zapolskiy <vz@...ia.com>, Liam Girdwood <lgirdwood@...il.com>,
 Mark Brown <broonie@...nel.org>, Russell King <linux@...linux.org.uk>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Andi Shyti <andi.shyti@...nel.org>,
 Miquel Raynal <miquel.raynal@...tlin.com>,
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>,
 Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
 Yangtao Li <frank.li@...o.com>, Arnd Bergmann <arnd@...db.de>,
 Li Zetao <lizetao1@...wei.com>, Chancel Liu <chancel.liu@....com>,
 Michael Ellerman <mpe@...erman.id.au>, Corentin Labbe <clabbe@...libre.com>,
 dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 alsa-devel@...a-project.org, linuxppc-dev@...ts.ozlabs.org,
 linux-sound@...r.kernel.org, linux-clk@...r.kernel.org,
 linux-i2c@...r.kernel.org, linux-mtd@...ts.infradead.org
Subject: Re: [Patch v5 12/12] i2x: pnx: Fix potential deadlock warning from
 del_timer_sync() call in isr

On 27/06/2024 17:00, Piotr Wojtaszczyk wrote:
> When del_timer_sync() is called in an interrupt context it throws a warning
> because of potential deadlock. The timer is used only to exit from
> wait_for_completion() after a timeout so replacing the call with
> wait_for_completion_timeout() allows to remove the problematic timer and
> its related functions altogether.

Subject typo: i2c

Best regards,
Krzysztof