drm/i915/gvt: Release gvt->lock at the failure of finding page track

page_track_handler take lock at the beginning, the lock should be released
at the failure of finding page track. Otherwise deadlock will happen.

Fixes: e502a2af4c35 ("drm/i915/gvt: Provide generic page_track infrastructure for write-protected page")
Signed-off-by: Xiong Zhang <xiong.y.zhang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/gvt/page_track.c b/drivers/gpu/drm/i915/gvt/page_track.c
index 09bd56e39ec6..2d030545356b 100644
--- a/drivers/gpu/drm/i915/gvt/page_track.c
+++ b/drivers/gpu/drm/i915/gvt/page_track.c
@@ -165,7 +165,7 @@ int intel_vgpu_page_track_handler(struct intel_vgpu *vgpu, u64 gpa,
 
         page_track = intel_vgpu_find_page_track(vgpu, gpa >> PAGE_SHIFT);
         if (!page_track)
-                return 0;
+                goto out;
 
         if (unlikely(vgpu->failsafe)) {
                 /* Remove write protection to prevent furture traps. */
@@ -176,6 +176,7 @@ int intel_vgpu_page_track_handler(struct intel_vgpu *vgpu, u64 gpa,
                         gvt_err("guest page write error, gpa %llx\n", gpa);
         }
 
+out:
         mutex_unlock(&gvt->lock);
         return ret;
 }