[PATCH 6.8 129/172] drm/msm/dp: fix runtime PM leak on disconnect

Greg Kroah-Hartman
2024-04-15T14:30:02Z

From: Johan Hovold <johan+linaro@kernel.org>

commit 0640f47b742667fca6aac174f7cd62b6c2c7532c upstream.

Make sure to put the runtime PM usage count (and suspend) also when
receiving a disconnect event while in the ST_MAINLINK_READY state.

This specifically avoids leaking a runtime PM usage count on every
disconnect with display servers that do not automatically enable
external displays when receiving a hotplug notification.

Fixes: 5814b8bf086a ("drm/msm/dp: incorporate pm_runtime framework into DP driver")
Cc: stable@vger.kernel.org # 6.8
Cc: Kuogee Hsieh <quic_khsieh@quicinc.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/582744/
Link: https://lore.kernel.org/r/20240313164306.23133-2-johan+linaro@kernel.org
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/msm/dp/dp_display.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -655,6 +655,7 @@ static int dp_hpd_unplug_handle(struct d
dp_display_host_phy_exit(dp);
dp->hpd_state = ST_DISCONNECTED;
dp_display_notify_disconnect(&dp->dp_display.pdev->dev);
+ pm_runtime_put_sync(&pdev->dev);
mutex_unlock(&dp->event_mutex);
return 0;
}