This is a note to let you know that I've just added the patch titled
drm/bridge: parade-ps8640: Make sure we drop the AUX mutex in the error case
to the 6.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-bridge-parade-ps8640-make-sure-we-drop-the-aux-m.patch
and it can be found in the queue-6.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 81fc49df427c4c8c7bd0427a3b722dd037e462c7
Author: Douglas Anderson <dianders@xxxxxxxxxxxx>
Date: Wed Jan 17 10:35:03 2024 -0800
drm/bridge: parade-ps8640: Make sure we drop the AUX mutex in the error case
[ Upstream commit a20f1b02bafcbf5a32d96a1d4185d6981cf7d016 ]
After commit 26db46bc9c67 ("drm/bridge: parade-ps8640: Ensure bridge
is suspended in .post_disable()"), if we hit the error case in
ps8640_aux_transfer() then we return without dropping the mutex. Fix
this oversight.
Fixes: 26db46bc9c67 ("drm/bridge: parade-ps8640: Ensure bridge is suspended in .post_disable()")
Reviewed-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx>
Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240117103502.1.Ib726a0184913925efc7e99c4d4fc801982e1bc24@changeid
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
index 166bfc725ef4..14d4dcf239da 100644
--- a/drivers/gpu/drm/bridge/parade-ps8640.c
+++ b/drivers/gpu/drm/bridge/parade-ps8640.c
@@ -351,11 +351,13 @@ static ssize_t ps8640_aux_transfer(struct drm_dp_aux *aux,
ret = _ps8640_wait_hpd_asserted(ps_bridge, 200 * 1000);
if (ret) {
pm_runtime_put_sync_suspend(dev);
- return ret;
+ goto exit;
}
ret = ps8640_aux_transfer_msg(aux, msg);
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
+
+exit:
mutex_unlock(&ps_bridge->aux_lock);
return ret;
