On 09/24/2013 03:34 PM, Tomi Valkeinen wrote:

On 23/09/13 19:19, Russell King - ARM Linux wrote:

quoted

On Mon, Sep 23, 2013 at 06:13:10PM +0200, Uwe Kleine-K?nig wrote:

quoted

The nice thing about devm_* is that the driver doesn't need to free the
resources but the driver core takes care about that. This also
simplifies the error path quite a bit and removes the wrong check for a
clock pointer being NULL.

Signed-off-by: Uwe Kleine-K?nig <redacted>
---
  drivers/video/mmp/hw/mmp_ctrl.c | 17 ++---------------
  1 file changed, 2 insertions(+), 15 deletions(-)

diff --git a/drivers/video/mmp/hw/mmp_ctrl.c b/drivers/video/mmp/hw/mmp_ctrl.c
index 75dca19..6ac7552 100644
--- a/drivers/video/mmp/hw/mmp_ctrl.c
+++ b/drivers/video/mmp/hw/mmp_ctrl.c

@@ -514,7 +514,7 @@ static int mmphw_probe(struct platform_device *pdev)
  	if (IS_ERR(ctrl->clk)) {
  		dev_err(ctrl->dev, "unable to get clk %s\n", mi->clk_name);
  		ret = -ENOENT;
-		goto failed_get_clk;
+		goto failed;
  	}
  	clk_prepare_enable(ctrl->clk);

@@ -551,21 +551,8 @@ failed_path_init:
  		path_deinit(path_plat);
  	}

-	if (ctrl->clk) {
-		devm_clk_put(ctrl->dev, ctrl->clk);
-		clk_disable_unprepare(ctrl->clk);

And this patch also fixes the above: disabling/unpreparing _after_ putting
the thing - which was quite silly... :)

Hmm, I wonder if that causes any issues... I.e. should this patch go for
3.12, or is 3.13 fine?

  Tomi

It would cause oops if probe failed due to some reason - although it 
would almost never happen so we missed it.
Thank you for finding it out.

-- 
Thanks, -Zhou