drm/nouveau: fix another lock unbalance in nouveau_crtc_page_flip

commit 806cbc5026933a781b66adecf6d1658fde9138e6 upstream.

Fixes a regression introduced by 060810d7abaabca "drm/nouveau: fix locking
issues in page flipping paths".  chan->cli->mutex is unlocked a second time
in the fail_unreserve path, fix this by moving mutex_unlock down.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index 7848590f5568e4142457a0f121d9282ca6d1ae17..fb072e6a361d40a7b527fd8a1e98e43cdfe0cc70 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -586,9 +586,9 @@ nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
        }
 
        ret = nouveau_page_flip_emit(chan, old_bo, new_bo, s, &fence);
-       mutex_unlock(&chan->cli->mutex);
        if (ret)
                goto fail_unreserve;
+       mutex_unlock(&chan->cli->mutex);
 
        /* Update the crtc struct and cleanup */
        crtc->fb = fb;