X-Git-Url: http://git.osdn.net/view?a=blobdiff_plain;f=block%2Fblk-mq-sysfs.c;h=36a43ed75c9adb2361150395c689a058491429f4;hb=refs%2Fheads%2F10;hp=1cf18784c5cf3c44be94dbd003ca9d7088f883e0;hpb=0aba0ab8915bcad3ae7e05e18bc2c5c55570e328;p=sagit-ice-cold%2Fkernel_xiaomi_msm8998.git

diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c
index 1cf18784c5cf..36a43ed75c9a 100644
--- a/block/blk-mq-sysfs.c
+++ b/block/blk-mq-sysfs.c
@@ -231,20 +231,25 @@ static ssize_t blk_mq_hw_sysfs_active_show(struct blk_mq_hw_ctx *hctx, char *pag
 
 static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
 {
+	const size_t size = PAGE_SIZE - 1;
 	unsigned int i, first = 1;
-	ssize_t ret = 0;
+	int ret = 0, pos = 0;
 
 	for_each_cpu(i, hctx->cpumask) {
 		if (first)
-			ret += sprintf(ret + page, "%u", i);
+			ret = snprintf(pos + page, size - pos, "%u", i);
 		else
-			ret += sprintf(ret + page, ", %u", i);
+			ret = snprintf(pos + page, size - pos, ", %u", i);
+
+		if (ret >= size - pos)
+			break;
 
 		first = 0;
+		pos += ret;
 	}
 
-	ret += sprintf(ret + page, "\n");
-	return ret;
+	ret = snprintf(pos + page, size + 1 - pos, "\n");
+	return pos + ret;
 }
 
 static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_dispatched = {