From a2d6e2ef6ed7d2d4c5cbdb857e38ecf6ccb9766c Mon Sep 17 00:00:00 2001
From: David Keitel <dkeitel@codeaurora.org>
Date: Wed, 23 Mar 2016 20:57:21 -0700
Subject: [PATCH] checkpatch: warn on subject line not followed by blank line

Fixed case when no warning generated for long subject line that is
wrapped to more than one line, and all lines are less than line limit.

New warning message added:
"non-blank line after summary line"
Now there are two warnings possible for the subject line, the original
line over limit and the new one. Depending on the error(s) any
combination of the two warnings are possible.

Commit text requirements now:
1) Must be less than 75 characters
2) Must be followed by blank line.

Change-Id: Id28d7a2eee561a1b1f45e51e346be3868c1fbad5
Signed-off-by: David Keitel <dkeitel@codeaurora.org>
---
 scripts/checkpatch.pl | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 47cc17673b85..7552c7837a35 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -18,6 +18,7 @@ use Encode qw(decode encode);
 use constant BEFORE_SHORTTEXT => 0;
 use constant IN_SHORTTEXT => 1;
 use constant AFTER_SHORTTEXT => 2;
+use constant CHECK_NEXT_SHORTTEXT => 3;
 use constant SHORTTEXT_LIMIT => 75;
 
 my $P = $0;
@@ -2279,6 +2280,8 @@ sub process {
 	my $prevrawline="";
 	my $stashline="";
 	my $stashrawline="";
+	my $subjectline="";
+	my $sublinenr="";
 
 	my $length;
 	my $indent;
@@ -2578,8 +2581,21 @@ sub process {
 					     SHORTTEXT_LIMIT .
 					     " characters\n" . $herecurr);
 				}
-			} elsif ($line=~/^Subject: \[[^\]]*\] (.*)/) {
+			} elsif ($shorttext == CHECK_NEXT_SHORTTEXT) {
 				$shorttext = IN_SHORTTEXT;
+# Check for Subject line followed by a blank line.
+				if (length($line) != 0) {
+					WARN("NONBLANK_AFTER_SUMMARY",
+					     "non-blank line after summary " .
+					     "line\n" . $sublinenr . $here .
+					     "\n" . $subjectline . "\n" .
+					     $line . "\n");
+				}
+			} elsif ($line=~/^Subject: \[[^\]]*\] (.*)/) {
+				$shorttext = CHECK_NEXT_SHORTTEXT;
+				$subjectline = $line;
+				$sublinenr = "#$linenr & ";
+# Check for Subject line less than line limit
 				if (length($1) > SHORTTEXT_LIMIT) {
 					WARN("LONG_SUMMARY_LINE",
 					     "summary line over " .