[Intel-gfx] [PATCH] dim: Avoid false positives with BUG detection

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

Makes sure that the diff line adding the BUG is not immediately
preceded by the diff line removing the BUG. Or in other words,
avoids false positives when existing BUG is edited.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 dim | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dim b/dim
index 1e7622a1e902..e32b24988571 100755
--- a/dim
+++ b/dim
@@ -691,7 +691,8 @@ function shell_checkpatch
 	local cmd=$1
 
 	$cmd | scripts/checkpatch.pl -q --strict - || true
-	if $cmd | grep '^\+.*\WBUG' > /dev/null; then
+	local bug_lines=$("$cmd" | grep -m 1 -B 1 '^\+.*\WBUG' | grep -c '^[+-]')
+	if test "$bug_lines" -eq 1; then
 		warn_or_fail "New BUG macro added"
 	fi
 	$cmd | grep '^\+.*drm_i915_private_t' > /dev/null && echo "WARNING: New drm_i915_private_t added" || true
-- 
1.9.1