drm/exynos: use pm_runtime_resume_and_get()

Use pm_runtime_resume_and_get() instead of pm_runtime_get_sync()
to deal with usage counter. pm_runtime_get_sync() increases the
usage counter even when it failed, which makes callers to forget
to decrease the usage counter and resulted in reference leak.

pm_runtime_resume_and_get() function decreases the usage counter
when it failed internally so it can avoid the reference leak.

Changelog v1:
- Fix an build error reported by kernel test robot of Intel.

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Reported-by: kernel test robot <lkp@intel.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_gsc.c b/drivers/gpu/drm/exynos/exynos_drm_gsc.c
index b01f36e76eaf..90d7bf906885 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gsc.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gsc.c
@@ -1118,7 +1118,12 @@ static int gsc_commit(struct exynos_drm_ipp *ipp,
 	struct gsc_context *ctx = container_of(ipp, struct gsc_context, ipp);
 	int ret;
 
-	pm_runtime_get_sync(ctx->dev);
+	ret = pm_runtime_resume_and_get(ctx->dev);
+	if (ret < 0) {
+		dev_err(ctx->dev, "failed to enable GScaler device.\n");
+		return ret;
+	}
+
 	ctx->task = task;
 
 	ret = gsc_reset(ctx);