[PATCH] drm/gem: Fix ww_acquire context leak in drm_gem_lru_scan()

[yaolu]

From: Lu Yao <yaolu@xxxxxxxxxx>

When ww_mutex_trylock() fails, the code jumps to the 'tail'
label, skipping the ww_acquire_fini() call that normally
follows. This leaks the ww_acquire context initialized by
ww_acquire_init().

Fix by moving ww_acquire_fini() into the 'tail' label section.

Fixes: 02070f049875 ("drm/gem: Add ww_acquire_ctx support to drm_gem_lru_scan()")
Signed-off-by: Lu Yao <yaolu@xxxxxxxxxx>
---
 drivers/gpu/drm/drm_gem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 6568fbdc4641..575a26ca9ca3 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -1722,10 +1722,10 @@ drm_gem_lru_scan(struct drm_device *dev,
 
 		dma_resv_unlock(obj->resv);
 
+tail:
 		if (ticket)
 			ww_acquire_fini(ticket);
 
-tail:
 		drm_gem_object_put(obj);
 		mutex_lock(&dev->gem_lru_mutex);
 	}
-- 
2.25.1