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drm/panthor: fix for dma-fence safe access rules

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Commit 506aa8b02a ("dma-fence: Add safe access helpers and document
the rules") details the dma-fence safe access rules. The most common
culprit is that drm_sched_fence_get_timeline_name may race with
group_free_queue.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Cc: stable@vger.kernel.org # v6.17+
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://patch.msgid.link/20251204174545.399059-1-olvaffe@gmail.com
This commit is contained in:
Chia-I Wu 2025-12-04 09:45:45 -08:00 committed by Steven Price
parent 97f419848b
commit efe2489848
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/panthor/panthor_sched.c
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@ -23,6 +23,7 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/rcupdate.h>
#include "panthor_devfreq.h"
#include "panthor_device.h"
@ -943,6 +944,9 @@ static void group_release_work(struct work_struct *work)
release_work);
u32 i;
/* dma-fences may still be accessing group->queues under rcu lock. */
synchronize_rcu();
for (i = 0; i < group->queue_count; i++)
group_free_queue(group, group->queues[i]);