linux-kernel - [PATCH 4.14 068/156] drm/rockchip: dw-mipi-dsi: fix possible un-balanced runtime PM enable

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Date:   Fri,  2 Feb 2018 17:57:29 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mirza Krak <mirza.krak@...ian.se>,
        Sandy Huang <hjc@...k-chips.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.14 068/156] drm/rockchip: dw-mipi-dsi: fix possible un-balanced runtime PM enable

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mirza Krak <mirza.krak@...ian.se>


[ Upstream commit 517f56839f581618d24f2e67a35738a5c6cbaecb ]

In the case where the bind gets deferred we would end up with a
un-balanced runtime PM enable call.

Fix this by simply moving the pm_runtime_enable call to the end of
the bind function when all paths have succeeded.

Signed-off-by: Mirza Krak <mirza.krak@...ian.se>
Signed-off-by: Sandy Huang <hjc@...k-chips.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1510734286-37434-1-git-send-email-mirza.krak@endian.se
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -1275,8 +1275,6 @@ static int dw_mipi_dsi_bind(struct devic
 		goto err_pllref;
 	}
 
-	pm_runtime_enable(dev);
-
 	dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
 	dsi->dsi_host.dev = dev;
 	ret = mipi_dsi_host_register(&dsi->dsi_host);
@@ -1291,6 +1289,7 @@ static int dw_mipi_dsi_bind(struct devic
 	}
 
 	dev_set_drvdata(dev, dsi);
+	pm_runtime_enable(dev);
 	return 0;
 
 err_mipi_dsi_host: