# Re: \[PATCH net-next 13/13\] scripts/checkpatch.pl: Add dev\_kfree\_skb\*(NULL) check to checkpatch

- From: Joe Perches \<joe@perches.com\>
- Date: 2013-11-04 14:23:05 
- List: netdev
- Page: https://ratatoskr.run/netdev/2013/11/4143264
- Thread: https://ratatoskr.run/linux-wireless/2013/11/4142803/t.md

```text
On Sat, 2013-11-02 at 19:17 +0530, Govindarajulu Varadarajan wrote:
> Signed-off-by: Govindarajulu Varadarajan <redacted>
[]
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -3719,7 +3719,7 @@ sub process {
>  # check for needless "if (<foo>) fn(<foo>)" uses
>  		if ($prevline =~ /\bif\s*\(\s*($Lval)\s*\)/) {
>  			my $expr = '\s*\(\s*' . quotemeta($1) . '\s*\)\s*;';
> -			if ($line =~ /\b(kfree|usb_free_urb|debugfs_remove(?:_recursive)?)$expr/) {
> +			if ($line =~ /\b(kfree|dev_kfree_skb|dev_kfree_skb_any|dev_kfree_skb_irq|usb_free_urb|debugfs_remove(?:_recursive)?)$expr/) {
>  				WARN('NEEDLESS_IF',
>  				     "$1(NULL) is safe this check is probably not required\n" . $hereprev);
>  			}

OK, but I think this is easier to read as

	dev_kfree_skb(?:_skb|_any|_irq)?
```