This is a note to let you know that I've just added the patch titled
accel/ivpu: Drop IRQF_ONESHOT to allow IPC IRQ threading on PREEMPT_RT
to the 7.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
accel-ivpu-drop-irqf_oneshot-to-allow-ipc-irq-threading-on-preempt_rt.patch
and it can be found in the queue-7.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 799c8f0b9f3fd728b32594aed3852044703b7e5b Mon Sep 17 00:00:00 2001
From: Karol Wachowski <[email protected]>
Date: Wed, 17 Jun 2026 11:20:31 +0200
Subject: accel/ivpu: Drop IRQF_ONESHOT to allow IPC IRQ threading on PREEMPT_RT
From: Karol Wachowski <[email protected]>
commit 799c8f0b9f3fd728b32594aed3852044703b7e5b upstream.
The IPC RX hardirq handler matches consumers under a spinlock and
allocates rx_msg buffers. On PREEMPT_RT these spinlocks become sleeping
locks and the allocation may sleep, neither of which is allowed in true
hardirq context, resulting in "sleeping function called from invalid
context" splats.
IRQF_ONESHOT makes genirq keep the primary handler in hardirq even when
forced threading is enabled, so on PREEMPT_RT the handler cannot be
threaded. Drop the flag so the primary handler is threaded on PREEMPT_RT
and the IPC RX path runs in a context where sleeping is allowed. On the
MSI interrupt chip (IRQCHIP_ONESHOT_SAFE) the flag was stripped anyway,
so non-RT behaviour is unchanged.
Fixes: 85c9cc2d25f8 ("accel/ivpu: Use threaded IRQ for IPC callback processing")
Cc: Andrzej Kacprowski <[email protected]>
Cc: Karol Wachowski <[email protected]>
Cc: [email protected]
Reviewed-by: Andrzej Kacprowski <[email protected]>
Signed-off-by: Karol Wachowski <[email protected]>
Link:
https://patch.msgid.link/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/accel/ivpu/ivpu_drv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/accel/ivpu/ivpu_drv.c
+++ b/drivers/accel/ivpu/ivpu_drv.c
@@ -624,7 +624,7 @@ static int ivpu_irq_init(struct ivpu_dev
vdev->irq = pci_irq_vector(pdev, 0);
ret = devm_request_threaded_irq(vdev->drm.dev, vdev->irq,
ivpu_hw_irq_handler,
- ivpu_ipc_irq_thread_handler,
IRQF_NO_AUTOEN | IRQF_ONESHOT,
+ ivpu_ipc_irq_thread_handler,
IRQF_NO_AUTOEN,
DRIVER_NAME, vdev);
if (ret)
ivpu_err(vdev, "Failed to request an IRQ %d\n", ret);
Patches currently in stable-queue which might be from
[email protected] are
queue-7.2/accel-ivpu-use-threaded-irq-for-ipc-callback-processing.patch
queue-7.2/accel-ivpu-drop-irqf_oneshot-to-allow-ipc-irq-threading-on-preempt_rt.patch
queue-7.2/accel-ivpu-use-separate-flag-for-job-timeout.patch
