linux-kernel - [PATCH V2] checkpatch: consolidate if (foo) bar(foo) checks and add debugfs

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Date:	Tue, 20 Nov 2012 19:17:39 +0000
From:	Andy Whitcroft <apw@...onical.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Constantine Shulyupin <const@...elinux.com>,
	linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH V2] checkpatch: consolidate if (foo) bar(foo) checks and add
 debugfs_remove

Consolidate the if (foo) bar(foo) detectors into a single check.  Add
debugfs_remove and family.

Based on a patch by Constantine Shulyupin <const@...eLinux.com>.

Signed-off-by: Andy Whitcroft <apw@...onical.com>
---
 scripts/checkpatch.pl |   20 ++++++--------------
 1 file changed, 6 insertions(+), 14 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index ae01b90..a1e2471 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3239,20 +3239,12 @@ sub process {
 				$herecurr);
 		}
 
-# check for needless kfree() checks
-		if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
-			my $expr = $1;
-			if ($line =~ /\bkfree\(\Q$expr\E\);/) {
-				WARN("NEEDLESS_KFREE",
-				     "kfree(NULL) is safe this check is probably not required\n" . $hereprev);
-			}
-		}
-# check for needless usb_free_urb() checks
-		if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
-			my $expr = $1;
-			if ($line =~ /\busb_free_urb\(\Q$expr\E\);/) {
-				WARN("NEEDLESS_USB_FREE_URB",
-				     "usb_free_urb(NULL) is safe this check is probably not required\n" . $hereprev);
+# check for needless "if (<foo>) fn(<foo>)" uses
+		if ($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/) {
+				WARN('NEEDLESS_IF',
+				     "$1(NULL) is safe this check is probably not required\n" . $hereprev);
 			}
 		}
 
-- 
1.7.10.4

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