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@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240117103502.1.Ib726a0184913925efc7e99c4d4fc801982e1bc24@changeid
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
index 166bfc7..14d4dcf 100644 (file)
--- 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;