[PATCH v2] drm/bridge: Add missing pm_runtime_put_sync

[Yongzhi Liu]

pm_runtime_get_sync() will increase the rumtime PM counter
even when it returns an error. Thus a pairing decrement is needed
to prevent refcount leak. Fix this by replacing this API with
pm_runtime_resume_and_get(), which will not change the runtime
PM counter on error. Besides, a matching decrement is needed
on the error handling path to keep the counter balanced.

Signed-off-by: Yongzhi Liu <lyz...@pku.edu.cn>
---
 drivers/gpu/drm/bridge/nwl-dsi.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
index 9282e61..30aacd9 100644
--- a/drivers/gpu/drm/bridge/nwl-dsi.c
+++ b/drivers/gpu/drm/bridge/nwl-dsi.c
@@ -862,18 +862,19 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
        memcpy(&dsi->mode, adjusted_mode, sizeof(dsi->mode));
        drm_mode_debug_printmodeline(adjusted_mode);
 
-       pm_runtime_get_sync(dev);
+       if (pm_runtime_resume_and_get(dev) < 0)
+               return;
 
        if (clk_prepare_enable(dsi->lcdif_clk) < 0)
-               return;
+               goto runtime_put;
        if (clk_prepare_enable(dsi->core_clk) < 0)
-               return;
+               goto runtime_put;
 
        /* Step 1 from DSI reset-out instructions */
        ret = reset_control_deassert(dsi->rst_pclk);
        if (ret < 0) {
                DRM_DEV_ERROR(dev, "Failed to deassert PCLK: %d\n", ret);
-               return;
+               goto runtime_put;
        }
 
        /* Step 2 from DSI reset-out instructions */
@@ -883,13 +884,18 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
        ret = reset_control_deassert(dsi->rst_esc);
        if (ret < 0) {
                DRM_DEV_ERROR(dev, "Failed to deassert ESC: %d\n", ret);
-               return;
+               goto runtime_put;
        }
        ret = reset_control_deassert(dsi->rst_byte);
        if (ret < 0) {
                DRM_DEV_ERROR(dev, "Failed to deassert BYTE: %d\n", ret);
-               return;
+               goto runtime_put;
        }
+
+       return;
+
+runtime_put:
+       pm_runtime_put_sync(dev);
 }
 
 static void
-- 
2.7.4