checkpatch: handle missing #if open in context

If the #if opening statement is not in the context then the context stack
can be empty.  Handle this by ensuring there is always a blank entry in
the stack.

Signed-off-by: Andy Whitcroft <apw@canonical.com>
Tested-by: Dhaval Giani <dhaval@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 7bed4ed2c519..eefef65fa584 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -411,13 +411,15 @@ sub ctx_statement_block {
 
         my $type = '';
         my $level = 0;
-        my @stack = ([$type, $level]);
+        my @stack = ();
         my $p;
         my $c;
         my $len = 0;
 
         my $remainder;
         while (1) {
+                @stack = (['', 0]) if ($#stack == -1);
+
                 #warn "CSB: blk<$blk> remain<$remain>\n";
                 # If we are about to drop off the end, pull in more
                 # context.