From: Qinglang Miao <miaoqinglang@huawei.com>
To: Andrzej Hajda <a.hajda@samsung.com>,
Neil Armstrong <narmstrong@baylibre.com>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Jonas Karlman <jonas@kwiboo.se>,
"Jernej Skrabec" <jernej.skrabec@siol.net>,
David Airlie <airlied@linux.ie>,
"Daniel Vetter" <daniel@ffwll.ch>
Cc: <dri-devel@lists.freedesktop.org>, <linux-kernel@vger.kernel.org>,
Qinglang Miao <miaoqinglang@huawei.com>
Subject: [PATCH] drm/bridge: cdns: fix reference leak in cdns_dsi_transfer
Date: Fri, 27 Nov 2020 17:44:35 +0800 [thread overview]
Message-ID: <20201127094435.120907-1-miaoqinglang@huawei.com> (raw)
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@huawei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.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
reply other threads:[~2020-11-27 9:41 UTC|newest]
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