From 5d951856df6d6dc8833d226a3aee2c59ce3f5fb8 Mon Sep 17 00:00:00 2001
From: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
Date: Tue, 21 Jul 2020 20:22:40 +0800
Subject: [PATCH] alinux: block: initialize io hang counter

fix #29420707

Otherwise we'll get stale io hang counter.

Signed-off-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
---
 block/genhd.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/block/genhd.c b/block/genhd.c
index d684dce1e3b2..cee247f2c4b2 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -102,6 +102,7 @@ static void blk_in_hang_rw(struct request_queue *q, struct hd_struct *part,
 	struct request *rq, *tmp;
 
 	now = ktime_get_ns();
+	hang[0] = hang[1] = 0;
 	spin_lock_irqsave(q->queue_lock, flags);
 
 	list_for_each_entry_safe(rq, tmp, &q->timeout_list, timeout_list) {
-- 
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