drm/vc4: unlock on error in vc4_hvs_get_fifo_frame_count()

The default statement is never used in real life.  However, if it were
used for some reason then call drm_dev_exit() before returning.

Fixes: 8f2fc64773be ("drm/vc4: Fix reading of frame count on GEN5 / Pi4")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Link: https://patchwork.freedesktop.org/patch/msgid/b61a81b2-0101-43bd-a4f6-09cf3a016484@stanley.mountain
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

diff --git a/drivers/gpu/drm/vc4/vc4_hvs.c b/drivers/gpu/drm/vc4/vc4_hvs.c
index b42027636c719296ce1a527eea7f68137cc92cd2..4811d794001fa74deaf92bc1282f399eb7464c5e 100644 (file)
--- a/drivers/gpu/drm/vc4/vc4_hvs.c
+++ b/drivers/gpu/drm/vc4/vc4_hvs.c
@@ -522,7 +522,7 @@ u8 vc4_hvs_get_fifo_frame_count(struct vc4_hvs *hvs, unsigned int fifo)
                break;
        default:
                drm_err(drm, "Unknown VC4 generation: %d", vc4->gen);
-               return 0;
+               break;
        }
 
        drm_dev_exit(idx);