On Thu, Jan 09, 2014 at 08:39:37AM +0300, Dan Carpenter wrote:
> Debugfs functions return NULL on error. They return an ERR_PTR if you
> don't have debugfs configured.
>
> The way it's designed is that normally you are only supposed to test for
> NULL. In this code, if "dev->dfs_root" is an ERR_PTR then passing it to
> debugfs_create_file() will not cause a problem because
> debugfs_create_file() would also just a stub.
>
> Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
>
> diff --git a/drivers/usb/gadget/gr_udc.c b/drivers/usb/gadget/gr_udc.c
> index 5f9c65959dd2..b34a52171568 100644
> --- a/drivers/usb/gadget/gr_udc.c
> +++ b/drivers/usb/gadget/gr_udc.c
> @@ -226,13 +226,13 @@ static void gr_dfs_create(struct gr_udc *dev)
> const char *name = "gr_udc_state";
>
> dev->dfs_root = debugfs_create_dir(dev_name(dev->dev), NULL);
> - if (IS_ERR(dev->dfs_root)) {
> + if (!dev->dfs_root) {
> dev_err(dev->dev, "Failed to create debugfs directory\n");
> return;
> }
> dev->dfs_state = debugfs_create_file(name, 0444, dev->dfs_root,
> dev, &gr_dfs_fops);
> - if (IS_ERR(dev->dfs_state))
> + if (!dev->dfs_state)
> dev_err(dev->dev, "Failed to create debugfs file %s\n", name);
> }
Don't even check the return value of the calls, I don't think it
matters, right?
greg k-h
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