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gpu: host1x: Fix race in syncpt alloc/free

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Fix riace condition between host1x_syncpt_alloc()
and host1x_syncpt_put() by using kref_put_mutex()
instead of kref_put() + manual mutex locking.

This ensures no thread can acquire the
syncpt_mutex after the refcount drops to zero
but before syncpt_release acquires it.
This prevents races where syncpoints could
be allocated while still being cleaned up
from a previous release.

Remove explicit mutex locking in syncpt_release
as kref_put_mutex() handles this atomically.

Bug 5170956

Change-Id: I9e2348482d5c9646556576772f6b90fa7df3acd2
Signed-off-by: Mainak Sen <msen@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3369121
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
This commit is contained in:
Mainak Sen
2025-05-22 05:31:52 +00:00
committed by Jon Hunter
parent fd42ccc45d
commit 3137fbd9b4
1 changed files with 1 additions and 3 deletions
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4
drivers/gpu/host1x/syncpt.c
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@@ -428,8 +428,6 @@ static void syncpt_release(struct kref *ref)
sp->locked = false;
mutex_lock(&sp->host->syncpt_mutex);
#ifdef CONFIG_HOST1X_HAVE_SYNCPT_BASE
host1x_syncpt_base_free(sp->base);
sp->base = NULL;
@@ -454,7 +452,7 @@ void host1x_syncpt_put(struct host1x_syncpt *sp)
if (!sp)
return;
kref_put(&sp->ref, syncpt_release);
kref_put_mutex(&sp->ref, syncpt_release, &sp->host->syncpt_mutex);
}
EXPORT_SYMBOL(host1x_syncpt_put);