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[80.71.134.83]) by smtp.gmail.com with ESMTPSA id a4-20020aa7d744000000b004615f7495e0sm2325076eds.8.2022.11.25.15.32.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 25 Nov 2022 15:32:44 -0800 (PST) From: Ricardo Ribalda Date: Sat, 26 Nov 2022 00:32:22 +0100 Subject: [PATCH v2] mailbox: mtk-cmdq: Do not request irq until we are ready MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20221125-mtk-mailbox-v2-0-886f70c7173c@chromium.org> To: Matthias Brugger , Jassi Brar Cc: linux-mediatek@lists.infradead.org, Ricardo Ribalda , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org X-Mailer: b4 0.11.0-dev-696ae X-Developer-Signature: v=1; a=openpgp-sha256; l=1961; i=ribalda@chromium.org; h=from:subject:message-id; bh=QjxAB+2ksa7uNlJhD3r206IvwLS8xrHsNDF+xigH57s=; b=owEBbQKS/ZANAwAKAdE30T7POsSIAcsmYgBjgVCLcbL6+FYpmnVdQr6P3EW3wpQ5JbUz/SYX3vu5 oY2BcJ6JAjMEAAEKAB0WIQREDzjr+/4oCDLSsx7RN9E+zzrEiAUCY4FQiwAKCRDRN9E+zzrEiGx7D/ 4unhnIlngokFsgCtXIVGn9UwrructwwSqM3dW4jQBnylKPqVJBca+a8ifBW4QvCFH2SCFxLJEynWrN 4KtM6nYyBvJnucIh6FC4je5ktr11CplKMAxcBPEe6ICJffvI4Lmn7eiobgKrC2V8mBqm1KMhPHTBvI XRxf1SjycDxThmDNqZnBEBBbpKSMKnnNYet/PTydUs/vrpU84H+MplwHGKiqp/BX8GEU66oYrUZCeK T2BX4vf+3BySMNlY8McuJGyqG+ttCsVzc/Kku6QkxicxfouNV7AvaBo2ojfnR7v5F7+7AWm1ToaCLr 7gQgFT+yedAUHdoXmb+1dv59ZqAIuNW2tPcMM9/hhnlqDrcjskHRKGf/4Rg1TAwXaqXctMK7u8R4EY MEGFHMXAM116HamLBnLWOllsw/o31HMbxK5RBxtBHP61yJHdPKp74++DX6+oAKirP+EgSlqsWHv5ti PUg3rxPrngU/05UDKD6g3Z4piSUEgMo+Aks7CFnU9/5OZ4gcw6EiSTep8cdxR4SqjhmWEK7dRb0oKG OYoQX+yoX/03xtE8/GCy7uXJXQ1o4hT2UryOcBjQTfqInB3ypoJCBQ2tvWo9h0dGsSKgRds4Ihds7d YlO78muMw5YUW/EaMOwDE/dc5depwtst6yA0lnjtdAHP0WWufniasBGi1Emw== X-Developer-Key: i=ribalda@chromium.org; a=openpgp; fpr=9EC3BB66E2FC129A6F90B39556A0D81F9F782DA9 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If the system comes from kexec() the peripheral might trigger an IRQ befoe we are ready for it. Triggering a crash due to an access to invalid memory. Signed-off-by: Ricardo Ribalda --- To: Jassi Brar To: Matthias Brugger Cc: linux-kernel@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-mediatek@lists.infradead.org --- Changes in v2: - I have managed to repro a different panic. Moving the irq enabling to the= very end of probe. - Link to v1: https://lore.kernel.org/r/20221125-mtk-mailbox-v1-0-2e3ee1208= 50c@chromium.org --- drivers/mailbox/mtk-cmdq-mailbox.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-= mailbox.c index 9465f9081515..9ff4f89a55c0 100644 --- a/drivers/mailbox/mtk-cmdq-mailbox.c +++ b/drivers/mailbox/mtk-cmdq-mailbox.c @@ -545,12 +545,6 @@ static int cmdq_probe(struct platform_device *pdev) cmdq->control_by_sw =3D plat_data->control_by_sw; cmdq->gce_num =3D plat_data->gce_num; cmdq->irq_mask =3D GENMASK(cmdq->thread_nr - 1, 0); - err =3D devm_request_irq(dev, cmdq->irq, cmdq_irq_handler, IRQF_SHARED, - "mtk_cmdq", cmdq); - if (err < 0) { - dev_err(dev, "failed to register ISR (%d)\n", err); - return err; - } =20 dev_dbg(dev, "cmdq device: addr:0x%p, va:0x%p, irq:%d\n", dev, cmdq->base, cmdq->irq); @@ -617,6 +611,13 @@ static int cmdq_probe(struct platform_device *pdev) =20 cmdq_init(cmdq); =20 + err =3D devm_request_irq(dev, cmdq->irq, cmdq_irq_handler, IRQF_SHARED, + "mtk_cmdq", cmdq); + if (err < 0) { + dev_err(dev, "failed to register ISR (%d)\n", err); + return err; + } + return 0; } =20 --- base-commit: 4312098baf37ee17a8350725e6e0d0e8590252d4 change-id: 20221125-mtk-mailbox-ba6cbd1d91b6 Best regards, --=20 Ricardo Ribalda