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drm/panthor: Keep the reset work disabled until everything is initialized

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The reset work will sub-component reset helpers, which might not be
ready if the reset happens during initialization, leading to NULL
pointer dereferences or worse.

Avoid that by keeping the reset work disabled while we're initializing
those sub-components.

Fixes: 5fe909cae1 ("drm/panthor: Add the device logical block")
Reported-by: sashiko-bot@kernel.org
Closes: https://sashiko.dev/#/patchset/20260625-panthor-signal-from-irq-v5-0-8836a74e0ef9@collabora.com?part=4
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
Link: https://patch.msgid.link/20260625-panthor-misc-fixes-v1-2-b67ed973fea6@collabora.com
This commit is contained in:
Boris Brezillon 2026-06-25 14:40:28 +02:00 committed by Liviu Dudau
parent 778c57d624
commit 1b8d771fb2
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/panthor/panthor_device.c
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@ -207,6 +207,7 @@ int panthor_device_init(struct panthor_device *ptdev)
*dummy_page_virt = 1;
INIT_WORK(&ptdev->reset.work, panthor_device_reset_work);
disable_work(&ptdev->reset.work);
ptdev->reset.wq = alloc_ordered_workqueue("panthor-reset-wq", 0);
if (!ptdev->reset.wq)
return -ENOMEM;
@ -285,6 +286,9 @@ int panthor_device_init(struct panthor_device *ptdev)
panthor_gem_init(ptdev);
/* Now that everything is initialized, we can enable the reset work. */
enable_work(&ptdev->reset.work);
/* ~3 frames */
pm_runtime_set_autosuspend_delay(ptdev->base.dev, 50);
pm_runtime_use_autosuspend(ptdev->base.dev);