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 <[email protected]>
---
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 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");
base-commit: e783362eb54cd99b2cac8b3a9aeac942e6f6ac07
prerequisite-patch-id: 59cdecee7d1b3bdd110f0d01790b92428b91862a
--
2.34.1
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,
--
Bjorn Andersson <[email protected]>