[PATCH -next] drm/i915: Fix missing unlock on error in i915_gem_init_hw()

[weiyj_lk]

From: Wei Yongjun <yongjun_wei@xxxxxxxxxxxxxxxxx>

Add the missing unlock before return from function i915_gem_init_hw()
in the error handling case.

Signed-off-by: Wei Yongjun <yongjun_wei@xxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_gem.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index d2ba315..3eeb2d0 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4879,8 +4879,10 @@ i915_gem_init_hw(struct drm_device *dev)
 	i915_gem_init_swizzling(dev);
 
 	ret = dev_priv->gt.init_rings(dev);
-	if (ret)
+	if (ret) {
+		mutex_unlock(&dev->struct_mutex);
 		return ret;
+	}
 
 	for (i = 0; i < NUM_L3_SLICES(dev); i++)
 		i915_gem_l3_remap(&dev_priv->ring[RCS], i);

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