linux-kernel - [PATCH 15/23] checkpatch: usb_free

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Date:	Thu, 12 Jun 2008 13:05:54 +0100
From:	Andy Whitcroft <apw@...dowen.org>
To:	Andrew Morton <akpm@...l.org>
Cc:	Randy Dunlap <rdunlap@...otime.net>,
	Joel Schopp <jschopp@...tin.ibm.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Andy Whitcroft <apw@...dowen.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 15/23] checkpatch: usb_free_urb() can take NULL

From: Greg Kroah-Hartman <gregkh@...e.de>

usb_free_urb() can take a NULL, so let's check and warn about that.

Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andy Whitcroft <apw@...dowen.org>
---
 scripts/checkpatch.pl |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 13d7a33..a4e8087 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2078,6 +2078,13 @@ sub process {
 				WARN("kfree(NULL) is safe this check is probabally 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("usb_free_urb(NULL) is safe this check is probably not required\n" . $hereprev);
+			}
+		}
 
 # warn about #ifdefs in C files
 #		if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
-- 
1.5.6.rc0.140.ga9675

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