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drm/qxl: avoid dependency lock 

qxl_bo_unref calls drm_gem_object_unreference_unlocked which
locks dev->struct_mutex. However this lock could be already
locked if the call came from qxl_gem_object_free.
As we don't need to call qxl_bo_ref/qxl_bo_unref cause
qxl_release_list_add will hold a reference by itself avoid
to call them and the possible deadlock.

Signed-off-by: Frediano Ziglio <fziglio@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Frediano Ziglio 2015-09-24 14:18:22 +01:00 committed by Dave Airlie
parent 7eb9974f36
commit 266424b537
1 changed files with 1 additions and 3 deletions
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4
drivers/gpu/drm/qxl/qxl_release.c
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@ -307,7 +307,7 @@ int qxl_alloc_surface_release_reserved(struct qxl_device *qdev,
idr_ret = qxl_release_alloc(qdev, QXL_RELEASE_SURFACE_CMD, release);
if (idr_ret < 0)
return idr_ret;
bo = qxl_bo_ref(to_qxl_bo(entry->tv.bo));
bo = to_qxl_bo(entry->tv.bo);
(*release)->release_offset = create_rel->release_offset + 64;
@ -316,8 +316,6 @@ int qxl_alloc_surface_release_reserved(struct qxl_device *qdev,
info = qxl_release_map(qdev, *release);
info->id = idr_ret;
qxl_release_unmap(qdev, *release, info);
qxl_bo_unref(&bo);
return 0;
}