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Tue, 07 Jul 2020 11:33:23 -0700 (PDT) Received: from kozik-lap ([194.230.155.195]) by smtp.googlemail.com with ESMTPSA id q7sm2359182wrs.27.2020.07.07.11.33.21 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 07 Jul 2020 11:33:22 -0700 (PDT) Date: Tue, 7 Jul 2020 20:33:20 +0200 From: Krzysztof Kozlowski To: Oleksij Rempel , Pengutronix Kernel Team , Shawn Guo , Sascha Hauer , Fabio Estevam , NXP Linux Team , Wolfram Sang , linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 2/2] i2c: imx: Fix external abort on interrupt in exit paths Message-ID: <20200707183320.GA3442@kozik-lap> References: <1592130544-19759-1-git-send-email-krzk@kernel.org> <1592130544-19759-2-git-send-email-krzk@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1592130544-19759-2-git-send-email-krzk@kernel.org> User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200707_143324_893221_798AF315 X-CRM114-Status: GOOD ( 15.38 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Oleksij Rempel , Marc Kleine-Budde , stable@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sun, Jun 14, 2020 at 12:29:04PM +0200, Krzysztof Kozlowski wrote: > If interrupt comes late, during probe error path or device remove (could > be triggered with CONFIG_DEBUG_SHIRQ), the interrupt handler > i2c_imx_isr() will access registers with the clock being disabled. This > leads to external abort on non-linefetch on Toradex Colibri VF50 module > (with Vybrid VF5xx): > > Unhandled fault: external abort on non-linefetch (0x1008) at 0x8882d003 > Internal error: : 1008 [#1] ARM > Modules linked in: > CPU: 0 PID: 1 Comm: swapper Not tainted 5.7.0 #607 > Hardware name: Freescale Vybrid VF5xx/VF6xx (Device Tree) > (i2c_imx_isr) from [<8017009c>] (free_irq+0x25c/0x3b0) > (free_irq) from [<805844ec>] (release_nodes+0x178/0x284) > (release_nodes) from [<80580030>] (really_probe+0x10c/0x348) > (really_probe) from [<80580380>] (driver_probe_device+0x60/0x170) > (driver_probe_device) from [<80580630>] (device_driver_attach+0x58/0x60) > (device_driver_attach) from [<805806bc>] (__driver_attach+0x84/0xc0) > (__driver_attach) from [<8057e228>] (bus_for_each_dev+0x68/0xb4) > (bus_for_each_dev) from [<8057f3ec>] (bus_add_driver+0x144/0x1ec) > (bus_add_driver) from [<80581320>] (driver_register+0x78/0x110) > (driver_register) from [<8010213c>] (do_one_initcall+0xa8/0x2f4) > (do_one_initcall) from [<80c0100c>] (kernel_init_freeable+0x178/0x1dc) > (kernel_init_freeable) from [<80807048>] (kernel_init+0x8/0x110) > (kernel_init) from [<80100114>] (ret_from_fork+0x14/0x20) > > Additionally, the i2c_imx_isr() could wake up the wait queue > (imx_i2c_struct->queue) before its initialization happens. > > The resource-managed framework should not be used for interrupt handling, > because the resource will be released too late - after disabling clocks. > The interrupt handler is not prepared for such case. > > Fixes: 1c4b6c3bcf30 ("i2c: imx: implement bus recovery") > Cc: > Signed-off-by: Krzysztof Kozlowski > > --- > > Changes since v1: > 1. Remove the devm- and use regular methods. Hi everyone, Similar patch for SPI driver was already merged [1]. Any comments here? Best regards, Krzysztof [1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=3d87b613d6a3c6f0980e877ab0895785a2dde581 > --- > drivers/i2c/busses/i2c-imx.c | 25 ++++++++++++++----------- > 1 file changed, 14 insertions(+), 11 deletions(-) > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel