Patch "accel/ivpu: Drop IRQF_ONESHOT to allow IPC IRQ threading on PREEMPT_RT" has been added to the 7.2-stable tree

[<gregkh@linuxfoundation.org>]

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 <stable@vger.kernel.org> know about it.


From 799c8f0b9f3fd728b32594aed3852044703b7e5b Mon Sep 17 00:00:00 2001
From: Karol Wachowski <karol.wachowski@linux.intel.com>
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 <karol.wachowski@linux.intel.com>

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 <andrzej.kacprowski@linux.intel.com>
Cc: Karol Wachowski <karol.wachowski@linux.intel.com>
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Andrzej Kacprowski <andrzej.kacprowski@linux.intel.com>
Signed-off-by: Karol Wachowski <karol.wachowski@linux.intel.com>
Link: https://patch.msgid.link/20260617092031.3016582-1-karol.wachowski@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 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 karol.wachowski@linux.intel.com 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