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.

Signed-off-by: Andy Whitcroft <apw@canonical.com>
Cc: Constantine Shulyupin <const@MakeLinux.com>.
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 14 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index d2d5ba17ad6..a1b870d188c 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3198,20 +3198,12 @@ 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);
                         }
                 }