drm/vc4: hdmi: Fix PM reference leak in vc4_hdmi_encoder_pre_crtc_co()

pm_runtime_get_sync will increment pm usage counter even it failed.
Forgetting to putting operation will result in reference leak here.
Fix it by replacing it with pm_runtime_resume_and_get to keep usage
counter balanced.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zou Wei <zou_wei@huawei.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/1621840854-105978-1-git-send-email-zou_wei@huawei.com

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 015d1e9..f9de863 100644 (file)
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -901,7 +901,7 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
        unsigned long bvb_rate, pixel_rate, hsm_rate;
        int ret;
 
-       ret = pm_runtime_get_sync(&vc4_hdmi->pdev->dev);
+       ret = pm_runtime_resume_and_get(&vc4_hdmi->pdev->dev);
        if (ret < 0) {
                DRM_ERROR("Failed to retain power domain: %d\n", ret);
                return;