[PATCH] checkpatch: debugfs_remove() can take NULL

[Constantine Shulyupin <const@MakeLinux.com>]

From: Constantine Shulyupin <const@MakeLinux.com>

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

Signed-off-by: Constantine Shulyupin <const@MakeLinux.com>
---
 scripts/checkpatch.pl |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index f18750e..c062476 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3221,6 +3221,14 @@ sub process {
 				     "kfree(NULL) is safe this check is probably not required\n" . $hereprev);
 			}
 		}
+# check for needless debugfs_remove() checks
+		if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
+			my $expr = $1;
+			if ($line =~ /\bdebugfs_remove\(\Q$expr\E\);/) {
+				WARN("NEEDLESS_DEBUGFS_REMOVE",
+				     "debugfs_remove(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;
-- 
1.7.9.5