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[100.0.210.47]) by smtp.gmail.com with ESMTPSA id x22-20020a05620a449600b006cf3592cc20sm12155356qkp.55.2022.10.03.10.11.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Oct 2022 10:11:32 -0700 (PDT) From: Eric Chanudet To: Andy Gross , Bjorn Andersson , Manivannan Sadhasivam , Jassi Brar , Sebastian Andrzej Siewior Cc: linux-arm-msm@vger.kernel.org, linux-rt-users@vger.kernel.org, linux-kernel@vger.kernel.org, Eric Chanudet Subject: [PATCH] mailbox: qcom-ipcc: flag IRQ NO_THREAD Date: Mon, 3 Oct 2022 13:08:49 -0400 Message-Id: <20221003170849.383005-1-echanude@redhat.com> X-Mailer: git-send-email 2.37.3 MIME-Version: 1.0 Content-type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org PREEMPT_RT forces qcom-ipcc's handler to be threaded with interrupts enabled, which triggers a warning in __handle_irq_event_percpu(): irq 173 handler irq_default_primary_handler+0x0/0x10 enabled interrupts WARNING: CPU: 0 PID: 77 at kernel/irq/handle.c:161 __handle_irq_event_percpu+0x4c4/0x4d0 Mark it IRQF_NO_THREAD to avoid running the handler in a threaded context with threadirqs or PREEMPT_RT enabled. Signed-off-by: Eric Chanudet Acked-by: Sebastian Andrzej Siewior --- drivers/mailbox/qcom-ipcc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/mailbox/qcom-ipcc.c b/drivers/mailbox/qcom-ipcc.c index 31d58b7d55fe..7e27acf6c0cc 100644 --- a/drivers/mailbox/qcom-ipcc.c +++ b/drivers/mailbox/qcom-ipcc.c @@ -308,7 +308,8 @@ static int qcom_ipcc_probe(struct platform_device *pdev) goto err_mbox; ret = devm_request_irq(&pdev->dev, ipcc->irq, qcom_ipcc_irq_fn, - IRQF_TRIGGER_HIGH | IRQF_NO_SUSPEND, name, ipcc); + IRQF_TRIGGER_HIGH | IRQF_NO_SUSPEND | + IRQF_NO_THREAD, name, ipcc); if (ret < 0) { dev_err(&pdev->dev, "Failed to register the irq: %d\n", ret); goto err_req_irq;