netdev - [PATCH net v4] ethernet: s2io: don't call dev_kfree_skb() under spin_lock

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Date:   Thu, 8 Dec 2022 20:01:21 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <netdev@...r.kernel.org>
CC:     <jdmason@...zu.us>, <davem@...emloft.net>, <edumazet@...gle.com>,
        <kuba@...nel.org>, <pabeni@...hat.com>, <leon@...nel.org>
Subject: [PATCH net v4] ethernet: s2io: don't call dev_kfree_skb() under spin_lock_irqsave()

It is not allowed to call kfree_skb() or consume_skb() from hardware
interrupt context or with hardware interrupts being disabled.

It should use dev_kfree_skb_irq() or dev_consume_skb_irq() instead.
The difference between them is free reason, dev_kfree_skb_irq() means
the SKB is dropped in error and dev_consume_skb_irq() means the SKB
is consumed in normal.

In this case, dev_kfree_skb() is called in free_tx_buffers() to drop
the SKBs in tx buffers, when the card is down, so replace it with
dev_kfree_skb_irq() here.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
v4 -> v3:
  Update commit message, and change to use dev_kfree_skb_irq().

v2 -> v3:
  Update commit message.

v1 -> v2:
  Add fix tag.
---
 drivers/net/ethernet/neterion/s2io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/neterion/s2io.c b/drivers/net/ethernet/neterion/s2io.c
index 1d3c4474b7cb..a83d61d45936 100644
--- a/drivers/net/ethernet/neterion/s2io.c
+++ b/drivers/net/ethernet/neterion/s2io.c
@@ -2386,7 +2386,7 @@ static void free_tx_buffers(struct s2io_nic *nic)
 			skb = s2io_txdl_getskb(&mac_control->fifos[i], txdp, j);
 			if (skb) {
 				swstats->mem_freed += skb->truesize;
-				dev_kfree_skb(skb);
+				dev_kfree_skb_irq(skb);
 				cnt++;
 			}
 		}
-- 
2.25.1