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Wed, 30 Nov 2022 04:58:46 -0800 (PST) Received: from alco.roam.corp.google.com ([2620:0:1059:10:29cf:b72a:5a9b:a4aa]) by smtp.gmail.com with ESMTPSA id j10-20020a50ed0a000000b0046892e493dcsm619872eds.26.2022.11.30.04.58.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Nov 2022 04:58:46 -0800 (PST) From: Ricardo Ribalda Date: Wed, 30 Nov 2022 13:58:22 +0100 Subject: [PATCH v3] 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: 7bit Message-Id: <20221125-mtk-mailbox-v3-0-c4b635052b65@chromium.org> To: Jassi Brar , Matthias Brugger , AngeloGioacchino Del Regno Cc: linux-arm-kernel@lists.infradead.org, Ricardo Ribalda , linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org X-Mailer: b4 0.11.0-dev-696ae X-Developer-Signature: v=1; a=openpgp-sha256; l=2213; i=ribalda@chromium.org; h=from:subject:message-id; bh=JaMGeOMpmAXuv3OKor0whCcN0kyMhzBZsPq/TlDMCd0=; b=owEBbQKS/ZANAwAKAdE30T7POsSIAcsmYgBjh1N1HmjWa3ZkM+ohfEpYfD/yTFRjgkqcXvs7TAbz iHD9waiJAjMEAAEKAB0WIQREDzjr+/4oCDLSsx7RN9E+zzrEiAUCY4dTdQAKCRDRN9E+zzrEiNVbD/ 997bPhkM4Tp0Vm9eaTCHZ8XZDPLNvOrVogWdgK/ByjYWNQ4137QEZwgW+YLN7LCGEm6Z5ByeTACf0+ 3dSNgK+4ftYeEsYPIEzOVSVkfK+bWMz4H/y4/OrzicCKQOJTXsO9r47SmwYHLLM/7YL09pdpuGxAIG 7Aa2DYVQ8cQy0WctP5qFfZ7W6iGXFdZKRtTSCX2eHGwb6iPjCXAc1l+INxVyF8URkCIHF3zIF3zTL+ 3uyntHRoTPECk+hDVXm+htEE/l40MiVxoR6+/BH2YzMOJK4n0h8nhU4zTwok1Vkt5x8q9SpJsOnZFA nn3LauNEQJSHpUwhac+Y04QnL1FZCg6nhGOxLGtleSNrc3wDuLtHI0oMMx82SvGI7gH4FQgaP9yQte fvEClF21UVBxwTm0ZwEJG779oWAFitYo1NhkZOL2UN9/PytWLjI+NA8rj0bJVP+FNrvcQuMivvUbAv Xo6N5hFPbfCetD0jkRt0UGQ/FylvHNNzURWVIamvdZCuUTZUHcRQmojrT8EFSQKTprna5Q5HVYELKz LG/ze+fwSOUyskGXYl4KLaNvEjB7qZ/Q7t2YRAG1GnhHdZIlTEVrsiYL+e9OwA6eUSSvF+gxqAsqBx GaoDFXUS7nA3mDn7Joo3MvwEqbtrdjczM91St6Jt3JqhzuRpChFdNKAbrdYA== X-Developer-Key: i=ribalda@chromium.org; a=openpgp; fpr=9EC3BB66E2FC129A6F90B39556A0D81F9F782DA9 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net 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: AngeloGioacchino Del Regno 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 v3: - Rebase on top of https://patchwork.kernel.org/project/linux-mediatek/patch/20221102100736.37815-1-angelogioacchino.delregno@collabora.com/ - Link to v2: https://lore.kernel.org/r/20221125-mtk-mailbox-v2-0-886f70c7173c@chromium.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-v1-0-2e3ee120850c@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 a460ee26eb11..b18d47ea13a0 100644 --- a/drivers/mailbox/mtk-cmdq-mailbox.c +++ b/drivers/mailbox/mtk-cmdq-mailbox.c @@ -569,12 +569,6 @@ static int cmdq_probe(struct platform_device *pdev) } cmdq->irq_mask = GENMASK(cmdq->pdata->thread_nr - 1, 0); - err = 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; - } dev_dbg(dev, "cmdq device: addr:0x%p, va:0x%p, irq:%d\n", dev, cmdq->base, cmdq->irq); @@ -641,6 +635,13 @@ static int cmdq_probe(struct platform_device *pdev) cmdq_init(cmdq); + err = 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; } --- base-commit: 1642107db81361b4339643eb90af4839e2cf229f change-id: 20221125-mtk-mailbox-ba6cbd1d91b6 Best regards, -- Ricardo Ribalda