checkpatch: notice unbalanced else braces in a patch

Patches that add or modify code like

	} else
		<foo>
or
	else {
		<bar>

where one branch appears to have a brace and the other branch does not
have a brace should emit a --strict style message.

Link: http://lkml.kernel.org/r/c6be32747fc725cbc235802991746700a0f54fdc.1486754390.git.joe@perches.com
Signed-off-by: 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, 0 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 12db1483e6c2..7fb73d92801c 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5104,6 +5104,12 @@ sub process {
                         }
                 }
 
+# check for single line unbalanced braces
+                if ($sline =~ /.\s*\}\s*else\s*$/ ||
+                    $sline =~ /.\s*else\s*\{\s*$/) {
+                        CHK("BRACES", "Unbalanced braces around else statement\n" . $herecurr);
+                }
+
 # check for unnecessary blank lines around braces
                 if (($line =~ /^.\s*}\s*$/ && $prevrawline =~ /^.\s*$/)) {
                         if (CHK("BRACES",