linux-kernel - [PATCH] drm/bridge: parade-ps8640: Make sure we drop the AUX mutex in the error case

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Message-ID: <20240117103502.1.Ib726a0184913925efc7e99c4d4fc801982e1bc24@changeid>
Date: Wed, 17 Jan 2024 10:35:03 -0800
From: Douglas Anderson <dianders@...omium.org>
To: dri-devel@...ts.freedesktop.org
Cc: Hsin-Yi Wang <hsinyi@...omium.org>,
	Douglas Anderson <dianders@...omium.org>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Daniel Vetter <daniel@...ll.ch>,
	David Airlie <airlied@...il.com>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Jonas Karlman <jonas@...boo.se>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Pin-yen Lin <treapking@...omium.org>,
	Robert Foss <rfoss@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drm/bridge: parade-ps8640: Make sure we drop the AUX mutex in the error case

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()")
Signed-off-by: Douglas Anderson <dianders@...omium.org>
---
Sorry for missing this in my review! :( Given that this is really
simple and I'd rather the buggy commit not be there for long, if I can
get a quick Reviewed-by tag on this patch I'll land it without the
typical stewing period.

 drivers/gpu/drm/bridge/parade-ps8640.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

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;
-- 
2.43.0.381.gb435a96ce8-goog