netdev - [PATCH net v3 1/2] net: apple: mace: don't call dev_kfree_skb() under spin_lock

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Date:   Thu, 8 Dec 2022 21:37:34 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <netdev@...r.kernel.org>
CC:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <leon@...nel.org>
Subject: [PATCH net v3 1/2] net: apple: mace: 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 mace_tx_timeout() to drop
the SKB, when tx timeout, so replace it with dev_kfree_skb_irq().

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
v2 -> v3:
  Update commit message, and change to use dev_kfree_skb_irq().

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

diff --git a/drivers/net/ethernet/apple/mace.c b/drivers/net/ethernet/apple/mace.c
index d0a771b65e88..77b4ed05140b 100644
--- a/drivers/net/ethernet/apple/mace.c
+++ b/drivers/net/ethernet/apple/mace.c
@@ -846,7 +846,7 @@ static void mace_tx_timeout(struct timer_list *t)
     if (mp->tx_bad_runt) {
 	mp->tx_bad_runt = 0;
     } else if (i != mp->tx_fill) {
-	dev_kfree_skb(mp->tx_bufs[i]);
+	dev_kfree_skb_irq(mp->tx_bufs[i]);
 	if (++i >= N_TX_RING)
 	    i = 0;
 	mp->tx_empty = i;
-- 
2.25.1