linux-kernel - [PATCH] drm/rockchip: Fix runtime PM imbalance on error

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Message-Id: <1642567073-25784-1-git-send-email-lyz_cs@pku.edu.cn>
Date:   Tue, 18 Jan 2022 20:37:53 -0800
From:   Yongzhi Liu <lyz_cs@....edu.cn>
To:     hjc@...k-chips.com, heiko@...ech.de, airlied@...ux.ie,
        daniel@...ll.ch
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Yongzhi Liu <lyz_cs@....edu.cn>
Subject: [PATCH] drm/rockchip: Fix runtime PM imbalance on error

pm_runtime_get_sync() will increase the rumtime PM counter
even it returns an error. Thus a pairing decrement is needed
to prevent refcount leak. Fix this by replacing this API with
pm_runtime_resume_and_get(), which will not change the runtime
PM counter on error.

Signed-off-by: Yongzhi Liu <lyz_cs@....edu.cn>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
index 4ed7a68..9cf53f0 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
@@ -1188,7 +1188,7 @@ static int dw_mipi_dsi_dphy_power_on(struct phy *phy)
 		return i;
 	}
 
-	ret = pm_runtime_get_sync(dsi->dev);
+	ret = pm_runtime_resume_and_get(dsi->dev);
 	if (ret < 0) {
 		DRM_DEV_ERROR(dsi->dev, "failed to enable device: %d\n", ret);
 		return ret;
-- 
2.7.4