checkpatch: fix false positive MISSING_BREAK warnings with --file

Using --file mode can give false positives with MISSING_BREAK
fall-through warnings on simple but long multiple consecutive case
statements.

Look for all lines before a case statement for a switch or a statement
when using --file mode.

Fix a misspelling of preceded while there.

Signed-off-by: Joe Perches <joe@perches.com>
Reported-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 10384cf..a0880ed 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4811,13 +4811,13 @@ sub process {
                        }
                }
 
-# check for case / default statements not preceeded by break/fallthrough/switch
+# check for case / default statements not preceded by break/fallthrough/switch
                if ($line =~ /^.\s*(?:case\s+(?:$Ident|$Constant)\s*|default):/) {
                        my $has_break = 0;
                        my $has_statement = 0;
                        my $count = 0;
                        my $prevline = $linenr;
-                       while ($prevline > 1 && $count < 3 && !$has_break) {
+                       while ($prevline > 1 && ($file || $count < 3) && !$has_break) {
                                $prevline--;
                                my $rline = $rawlines[$prevline - 1];
                                my $fline = $lines[$prevline - 1];