checkpatch: usb_free_urb() can take NULL

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

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 7 insertions, 0 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 58a94947d655..64ec4b8a51b5 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1889,6 +1889,13 @@ 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 probabally not required\n" . $hereprev);
+                        }
+                }
 
 # warn about #ifdefs in C files
 #               if ($line =~ /^.#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {