linux-kernel - [PATCH] drm/bridge: cdns: fix reference leak in cdns_dsi

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Message-ID: <20201127094435.120907-1-miaoqinglang@huawei.com>
Date:   Fri, 27 Nov 2020 17:44:35 +0800
From:   Qinglang Miao <miaoqinglang@...wei.com>
To:     Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        "Jernej Skrabec" <jernej.skrabec@...l.net>,
        David Airlie <airlied@...ux.ie>,
        "Daniel Vetter" <daniel@...ll.ch>
CC:     <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        Qinglang Miao <miaoqinglang@...wei.com>
Subject: [PATCH] drm/bridge: cdns: fix reference leak in cdns_dsi_transfer

pm_runtime_get_sync will increment pm usage counter even it
failed. Forgetting to putting operation will result in a
reference leak here.

A new function pm_runtime_resume_and_get is introduced in
[0] to keep usage counter balanced. So We fix the reference
leak by replacing it with new funtion.

[0] dd8088d5a896 ("PM: runtime: Add  pm_runtime_resume_and_get to deal with usage counter")

Fixes: e19233955d9e ("drm/bridge: Add Cadence DSI driver")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>
---
 drivers/gpu/drm/bridge/cdns-dsi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/cdns-dsi.c b/drivers/gpu/drm/bridge/cdns-dsi.c
index 76373e31d..b31281f76 100644
--- a/drivers/gpu/drm/bridge/cdns-dsi.c
+++ b/drivers/gpu/drm/bridge/cdns-dsi.c
@@ -1028,7 +1028,7 @@ static ssize_t cdns_dsi_transfer(struct mipi_dsi_host *host,
 	struct mipi_dsi_packet packet;
 	int ret, i, tx_len, rx_len;
 
-	ret = pm_runtime_get_sync(host->dev);
+	ret = pm_runtime_resume_and_get(host->dev);
 	if (ret < 0)
 		return ret;
 
-- 
2.23.0