[PATCH 4.14 17/57] fbdev: mmp: fix value check in mmphw_probe()

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

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

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

From: Yuanjun Gong <ruc_gongyuanjun@163.com>

commit 0872b2c0abc0e84ac82472959c8e14e35277549c upstream.

in mmphw_probe(), check the return value of clk_prepare_enable()
and return the error code if clk_prepare_enable() returns an
unexpected value.

Fixes: d63028c38905 ("video: mmp display controller support")
Signed-off-by: Yuanjun Gong <ruc_gongyuanjun@163.com>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/video/fbdev/mmp/hw/mmp_ctrl.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/video/fbdev/mmp/hw/mmp_ctrl.c
+++ b/drivers/video/fbdev/mmp/hw/mmp_ctrl.c
@@ -525,7 +525,9 @@ static int mmphw_probe(struct platform_d
 		ret = -ENOENT;
 		goto failed;
 	}
-	clk_prepare_enable(ctrl->clk);
+	ret = clk_prepare_enable(ctrl->clk);
+	if (ret)
+		goto failed;
 
 	/* init global regs */
 	ctrl_set_default(ctrl);