drm/v3d: fix a missing check of pm_runtime_get_sync

pm_runtime_get_sync could fail and thus deserves a check.

The patch adds such a check and return its error code upstream
if it indeed failed.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20190324231602.2436-1-kjlu@umn.edu
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>

diff --git a/drivers/gpu/drm/v3d/v3d_drv.c b/drivers/gpu/drm/v3d/v3d_drv.c
index d600628bb5c1facfb762d48edc5ec9ca4e44329d..a06b05f714a5e605caf2075c5a538415048776ef 100644 (file)
--- a/drivers/gpu/drm/v3d/v3d_drv.c
+++ b/drivers/gpu/drm/v3d/v3d_drv.c
@@ -102,6 +102,8 @@ static int v3d_get_param_ioctl(struct drm_device *dev, void *data,
                        return -EINVAL;
 
                ret = pm_runtime_get_sync(v3d->dev);
+               if (ret < 0)
+                       return ret;
                if (args->param >= DRM_V3D_PARAM_V3D_CORE0_IDENT0 &&
                    args->param <= DRM_V3D_PARAM_V3D_CORE0_IDENT2) {
                        args->value = V3D_CORE_READ(0, offset);