On Thu, Apr 02, 2015 at 12:38:19AM +0700, Phong Tran wrote:
> Add the remove() method for deregister from misc device
> when it's unloaded.
>
> Signed-off-by: Phong Tran <tranmanphong@xxxxxxxxx>
> ---
> drivers/staging/android/ion/ion_test.c | 18 ++++++++++++++++++
> 1 file changed, 18 insertions(+)
>
> diff --git a/drivers/staging/android/ion/ion_test.c b/drivers/staging/android/ion/ion_test.c
> index 3bc461c..f36a35e 100644
> --- a/drivers/staging/android/ion/ion_test.c
> +++ b/drivers/staging/android/ion/ion_test.c
> @@ -261,7 +261,25 @@ static int __init ion_test_probe(struct platform_device *pdev)
> return 0;
> }
>
> +static int ion_test_remove(struct platform_device *pdev)
> +{
> + int ret = 0;
Don't initialize variables if you don't need to. Just remove the ret
variable completely.
> + struct ion_test_device *testdev;
> +
> + testdev = platform_get_drvdata(pdev);
> +
> + if (!testdev) {
Remove the blank line between the function and the check. They are part
of the same thing/paragraph.
> + pr_err("failed to get pdev data.\n");
Just leave this error statement out. It will never get printed. It's
just a waste of RAM. If it were printed the -ENODATA error is unique
to this path so it's all the debug out put we need.
> + return -ENODATA;
> + }
> +
> + ret = misc_deregister(&testdev->misc);
> +
> + return ret;
return misc_deregister(&testdev->misc);
regards,
dan carpenter
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