| Message ID | 20220127173554.158111-1-daniel.thompson@linaro.org |
|---|---|
| State | Accepted |
| Commit | 8030cb9a55688c1339edd284d9d6ce5f9fc75160 |
| Headers | show |
| Series | soc: qcom: aoss: remove spurious IRQF_ONESHOT flags | expand |
On Thu, 27 Jan 2022 17:35:54 +0000, Daniel Thompson wrote: > 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. > > [...] Applied, thanks! [1/1] soc: qcom: aoss: remove spurious IRQF_ONESHOT flags commit: 8030cb9a55688c1339edd284d9d6ce5f9fc75160 Best regards,
diff --git a/drivers/soc/qcom/qcom_aoss.c b/drivers/soc/qcom/qcom_aoss.c index cbe5e39fdaeb0..83f1edcbf7a33 100644 --- a/drivers/soc/qcom/qcom_aoss.c +++ b/drivers/soc/qcom/qcom_aoss.c @@ -497,7 +497,7 @@ 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");
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. Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org> --- drivers/soc/qcom/qcom_aoss.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) base-commit: e783362eb54cd99b2cac8b3a9aeac942e6f6ac07 prerequisite-patch-id: 59cdecee7d1b3bdd110f0d01790b92428b91862a -- 2.34.1