linux-kernel - Re: [PATCH v1] gpio: pca953x: fix IRQ storm on system wake up

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Message-ID: <174368202234.27533.1000100252310062471.b4-ty@linaro.org>
Date: Thu,  3 Apr 2025 14:07:05 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Francesco Dolcini <francesco@...cini.it>
Cc: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	Emanuele Ghidoli <emanuele.ghidoli@...adex.com>,
	linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Marek Vasut <marek.vasut@...il.com>,
	stable@...r.kernel.org,
	Francesco Dolcini <francesco.dolcini@...adex.com>
Subject: Re: [PATCH v1] gpio: pca953x: fix IRQ storm on system wake up

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>


On Wed, 26 Mar 2025 18:38:38 +0100, Francesco Dolcini wrote:
> If an input changes state during wake-up and is used as an interrupt
> source, the IRQ handler reads the volatile input register to clear the
> interrupt mask and deassert the IRQ line. However, the IRQ handler is
> triggered before access to the register is granted, causing the read
> operation to fail.
> 
> As a result, the IRQ handler enters a loop, repeatedly printing the
> "failed reading register" message, until `pca953x_resume` is eventually
> called, which restores the driver context and enables access to
> registers.
> 
> [...]

Applied, thanks!

[1/1] gpio: pca953x: fix IRQ storm on system wake up
      commit: 23334dfbeec89bf79f2ab893034b50612d039594

Best regards,
-- 
Bartosz Golaszewski <bartosz.golaszewski@...aro.org>