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drm: rcar-du: Fix PM reference leak in rcar_cmm_enable() 

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] dd8088d5a8 ("PM: runtime: Add  pm_runtime_resume_and_get to deal with usage counter")

Fixes: e08e934d6c ("drm: rcar-du: Add support for CMM")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
This commit is contained in:
Qinglang Miao 2020-11-27 17:44:44 +08:00 committed by Laurent Pinchart
parent a1bc5e3145
commit 136ce7684b
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/rcar-du/rcar_cmm.c
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@ -122,7 +122,7 @@ int rcar_cmm_enable(struct platform_device *pdev)
{
int ret;
ret = pm_runtime_get_sync(&pdev->dev);
ret = pm_runtime_resume_and_get(&pdev->dev);
if (ret < 0)
return ret;