From: Daniel Thompson daniel.thompson@linaro.org
[ Upstream commit 8030cb9a55688c1339edd284d9d6ce5f9fc75160 ]
Quoting the header comments, IRQF_ONESHOT is "Used by threaded interrupts which need to keep the irq line disabled until the threaded handler has been run.". When applied to an interrupt that doesn't request a threaded irq then IRQF_ONESHOT has a lesser known (undocumented?) side effect, which it to disable the forced threading of the irq. For "normal" kernels (without forced threading) then, if there is no thread_fn, then IRQF_ONESHOT is a nop.
In this case disabling forced threading is not appropriate for this driver because it calls wake_up_all() and this API cannot be called from no-thread interrupt handlers on PREEMPT_RT systems (deadlock risk, triggers sleeping-while-atomic warnings).
Fix this by removing IRQF_ONESHOT.
Fixes: 2209481409b7 ("soc: qcom: Add AOSS QMP driver") Signed-off-by: Daniel Thompson daniel.thompson@linaro.org [bjorn: Added Fixes tag] Signed-off-by: Bjorn Andersson bjorn.andersson@linaro.org Link: https://lore.kernel.org/r/20220127173554.158111-1-daniel.thompson@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/soc/qcom/qcom_aoss.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/soc/qcom/qcom_aoss.c b/drivers/soc/qcom/qcom_aoss.c index 536c3e4114fb..a0659cf27845 100644 --- a/drivers/soc/qcom/qcom_aoss.c +++ b/drivers/soc/qcom/qcom_aoss.c @@ -548,7 +548,7 @@ static int qmp_probe(struct platform_device *pdev) }
irq = platform_get_irq(pdev, 0); - ret = devm_request_irq(&pdev->dev, irq, qmp_intr, IRQF_ONESHOT, + ret = devm_request_irq(&pdev->dev, irq, qmp_intr, 0, "aoss-qmp", qmp); if (ret < 0) { dev_err(&pdev->dev, "failed to request interrupt\n");