From 99fe21a76f0f2d36e5f9afc95ce6ed5cc354ebad Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>
Date: Thu, 4 Oct 2018 14:45:17 +0200
Subject: [PATCH] dma-buf: test shared slot allocation when mutex debugging is
active
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Set shared_max to the number of shared fences right before we release
the lock.
This way every attempt to add a shared fence without previously
reserving a slot will cause an error.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Acked-by: Junwei Zhang <Jerry.Zhang@amd.com>
Link: https://patchwork.kernel.org/patch/10626147/
---
include/linux/reservation.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/include/linux/reservation.h b/include/linux/reservation.h
index 5ddb0e143721f..2f0ffca357807 100644
--- a/include/linux/reservation.h
+++ b/include/linux/reservation.h
@@ -214,6 +214,11 @@ reservation_object_trylock(struct reservation_object *obj)
static inline void
reservation_object_unlock(struct reservation_object *obj)
{
+#ifdef CONFIG_DEBUG_MUTEXES
+ /* Test shared fence slot reservation */
+ if (obj->fence)
+ obj->fence->shared_max = obj->fence->shared_count;
+#endif
ww_mutex_unlock(&obj->lock);
}
--
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