From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4E6C8246773; Fri, 19 Sep 2025 00:33:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758242014; cv=none; b=d25c8q2ZbqDPSYrS64PNREWE0fZPn0pLaBLAq4wClwWkUqMyOeeDCjmzzmmSLyL+iXYOClCixevQeMRyrJQrkTSxlIbjfJFXjeiVTeNUlzHE62EjMhP24SUhPxPpHqknLerAYeleDB/abLbvMkP++gEZDxDZcC1Svb6Gc2fZ86E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758242014; c=relaxed/simple; bh=MvqdhfH2nX/TJ4+5NKKfQ+8Xw1soS4FUL5ceqWBJjCM=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=c3NDshJTO4sGCHZ764J1MrKs2DH/Umb+rf3MIiNnP+TeqjqzxjuQm57LkxWseVAJ4ZKD6NnWpfMU4R1ZGgYX5mFPyc82j9wj1tR4yDEmyS/pyfRJS9V8mEzqP0uNHBh/VV/1XUKnOmO4cgwmNwRtnRIP/h4IH74uQa2KAxE+Sis= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=uQkPxmXb; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="uQkPxmXb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B9D45C4CEE7; Fri, 19 Sep 2025 00:33:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1758242013; bh=MvqdhfH2nX/TJ4+5NKKfQ+8Xw1soS4FUL5ceqWBJjCM=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=uQkPxmXbxwUl6cwbOOZBY79XW1iBBiitcmNCoSjVxOKC5FXvBY1M8kA8bu3xdWn05 gnCysPWjCfb/rPVS7CjgqsJ/W54JCls5HYXoABZZjCum1nCkEuct1rQksqauvHtFem lTkMZblVerTEMb4PuRVHeZN2BKaYkRsgZ9+y1/a6pw9gB6nghW81Vo81EO+D6jH+oF GtRGkx0aO5XK7y4HNXn3Bhf1n9NWIcdkGXZ7KSElncIgT+VQwF5i9yh82sIFs/sh5t Jfe4hzP5d5gMKJXB9cXFRLRYc4DmGQnbRdGGMYtLkfLgCZMWja4qCGsyJBw5dEDMdk 8xklEUnyAfWIg== Message-ID: <4ca07bd0-d44a-488f-a97b-47774f253f73@kernel.org> Date: Fri, 19 Sep 2025 09:33:29 +0900 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] serial: qcom_geni: Fix pinctrl deadlock on runtime resume To: Praveen Talari , Greg Kroah-Hartman , Jiri Slaby , Bryan O'Donoghue , Praveen Talari , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, alexey.klimov@linaro.org, jorge.ramirez@oss.qualcomm.com, dmitry.baryshkov@oss.qualcomm.com, andersson@kernel.org Cc: psodagud@quicinc.com, djaggi@quicinc.com, quic_msavaliy@quicinc.com, quic_vtanuku@quicinc.com, quic_arandive@quicinc.com, quic_shazhuss@quicinc.com, quic_cchiluve@quicinc.com References: <20250917185102.3763398-1-praveen.talari@oss.qualcomm.com> <8e2781ae-34d2-4009-bf8c-56aa1bb6fe85@oss.qualcomm.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 18/09/2025 12:55, Praveen Talari wrote: > Hi Krzysztof, > > On 9/18/2025 5:28 AM, Krzysztof Kozlowski wrote: >> On 18/09/2025 03:51, Praveen Talari wrote: >>> A stall was observed in disable_irq() during >>> pinctrl_pm_select_default_state(), triggered by wakeup IRQ being active >>> while the UART port was not yet active. This led to a hang in >>> __synchronize_irq(), as shown in the following trace: >>> >>> Call trace: >>> __switch_to+0xe0/0x120 >>> __schedule+0x39c/0x978 >>> schedule+0x5c/0xf8 >>> __synchronize_irq+0x88/0xb4 >>> disable_irq+0x3c/0x4c >>> msm_pinmux_set_mux+0x508/0x644 >>> pinmux_enable_setting+0x190/0x2dc >>> pinctrl_commit_state+0x13c/0x208 >>> pinctrl_pm_select_default_state+0x4c/0xa4 >>> geni_se_resources_on+0xe8/0x154 >>> qcom_geni_serial_runtime_resume+0x4c/0x88 >>> pm_generic_runtime_resume+0x2c/0x44 >>> __genpd_runtime_resume+0x30/0x80 >>> genpd_runtime_resume+0x114/0x29c >>> __rpm_callback+0x48/0x1d8 >>> rpm_callback+0x6c/0x78 >>> rpm_resume+0x530/0x750 >>> __pm_runtime_resume+0x50/0x94 >>> handle_threaded_wake_irq+0x30/0x94 >>> irq_thread_fn+0x2c/0xa8 >>> irq_thread+0x160/0x248 >>> kthread+0x110/0x114 >>> ret_from_fork+0x10/0x20 >>> >>> To fix this, wakeup IRQ setup is moved from probe to UART startup, >>> ensuring it is only configured when the port is active. Correspondingly, >>> the wakeup IRQ is cleared during shutdown. This avoids premature IRQ >>> disable during pinctrl setup and prevents the observed stall. The probe >>> and remove pathsare simplified by removing redundant wakeup IRQ handling. >>> >>> Fixes: 1afa70632c39 ("serial: qcom-geni: Enable PM runtime for serial driver") >>> Reported-by: Alexey Klimov >>> Closes: https://lore.kernel.org/all/DC0D53ZTNOBU.E8LSD5E5Z8TX@linaro.org/ >>> Tested-by: Jorge Ramirez >> >> Where did you receive this tag for this patch exactly? > > Since Jorge was involved in validating the change, I’ve added him under > the Tested-by tag. > > Please correct me if I’m not supposed to add this tag myself. Yes, it is wrong. You did not receive the tag! Which process or document, suggested that you can create such tag? I commented on the patches, so you will add now "Reviewed-by" with my name? No. Best regards, Krzysztof