X-Git-Url: http://git.monstr.eu/?a=blobdiff_plain;ds=sidebyside;f=mm%2Fpage-writeback.c;h=9f459f7f8f8312b762cf2222927f39f10e023de6;hb=04094226d6ce8c0cb590891e13872109aa6722f1;hp=7e2da284e427188aafefe15b0d6b0f0c6ec80544;hpb=7a3ecddc571cc3294e5d6bb5948ff2b0cfa12735;p=linux-2.6-microblaze.git

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 7e2da284e427..9f459f7f8f83 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -650,18 +650,25 @@ static unsigned int bdi_min_ratio;
 
 int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio)
 {
+	unsigned int delta;
 	int ret = 0;
 
 	spin_lock_bh(&bdi_lock);
 	if (min_ratio > bdi->max_ratio) {
 		ret = -EINVAL;
 	} else {
-		min_ratio -= bdi->min_ratio;
-		if (bdi_min_ratio + min_ratio < 100) {
-			bdi_min_ratio += min_ratio;
-			bdi->min_ratio += min_ratio;
+		if (min_ratio < bdi->min_ratio) {
+			delta = bdi->min_ratio - min_ratio;
+			bdi_min_ratio -= delta;
+			bdi->min_ratio = min_ratio;
 		} else {
-			ret = -EINVAL;
+			delta = min_ratio - bdi->min_ratio;
+			if (bdi_min_ratio + delta < 100) {
+				bdi_min_ratio += delta;
+				bdi->min_ratio = min_ratio;
+			} else {
+				ret = -EINVAL;
+			}
 		}
 	}
 	spin_unlock_bh(&bdi_lock);