From d280d78b3ff670744053b5dc4af67e5fd74b972b Mon Sep 17 00:00:00 2001
From: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Date: Tue, 22 Sep 2020 10:16:30 +0800
Subject: [PATCH] dev: Defer free of skbs in flush_backlog

stable inclusion
from linux-4.19.136
commit 68c46a0adc6f0409946b6da6a903241ec7dbf5cd

--------------------------------

[ Upstream commit 7df5cb75cfb8acf96c7f2342530eb41e0c11f4c3 ]

IRQs are disabled when freeing skbs in input queue.
Use the IRQ safe variant to free skbs here.

Fixes: 145dd5f9c88f ("net: flush the softnet backlog in process context")
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>

Signed-off-by: Li Aichun <liaichun@huawei.com>
Reviewed-by:  guodeqing <geffrey.guo@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
 net/core/dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 4b1053057ca6..42ba150fa18d 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5252,7 +5252,7 @@ static void flush_backlog(struct work_struct *work)
 	skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
 		if (skb->dev->reg_state == NETREG_UNREGISTERING) {
 			__skb_unlink(skb, &sd->input_pkt_queue);
-			kfree_skb(skb);
+			dev_kfree_skb_irq(skb);
 			input_queue_head_incr(sd);
 		}
 	}
-- 
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