[PATCH v2 resend 0/4] net: don't call dev_kfree_skb() under spin_lock_irqsave()

[PATCH v2 resend 0/4] net: don't call dev_kfree_skb() under spin_lock_irqsave()

[Yang Yingliang]

It is not allowed to call consume_skb() from hardware interrupt context
or with interrupts being disabled. This patchset replace dev_kfree_skb()
with dev_consume_skb_irq() under spin_lock_irqsave() in some drivers, or
move dev_kfree_skb() after spin_unlock_irqrestore().

Resend for CC all authors / reviewers of commits under "Fixes:".

v1 -> v2:
  patch #2 Move dev_kfree_skb() after spin_unlock_irqrestore()

Yang Yingliang (4):
  net: emaclite: don't call dev_kfree_skb() under spin_lock_irqsave()
  net: ethernet: dnet: don't call dev_kfree_skb() under
    spin_lock_irqsave()
  hamradio: don't call dev_kfree_skb() under spin_lock_irqsave()
  net: amd: lance: don't call dev_kfree_skb() under spin_lock_irqsave()

 drivers/net/ethernet/amd/atarilance.c         | 2 +-
 drivers/net/ethernet/amd/lance.c              | 2 +-
 drivers/net/ethernet/dnet.c                   | 4 ++--
 drivers/net/ethernet/xilinx/xilinx_emaclite.c | 2 +-
 drivers/net/hamradio/scc.c                    | 6 +++---
 5 files changed, 8 insertions(+), 8 deletions(-)

-- 
2.25.1

[PATCH v2 resend 1/4] net: emaclite: don't call dev_kfree_skb() under spin_lock_irqsave()

[Yang Yingliang]

It is not allowed to call consume_skb() from hardware interrupt context
or with interrupts being disabled. So replace dev_kfree_skb() with
dev_consume_skb_irq() under spin_lock_irqsave().

Fixes: bb81b2ddfa19 ("net: add Xilinx emac lite device driver")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
 drivers/net/ethernet/xilinx/xilinx_emaclite.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/xilinx/xilinx_emaclite.c b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
index a3967f8de417..a1e1387ea84e 100644
--- a/drivers/net/ethernet/xilinx/xilinx_emaclite.c
+++ b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
@@ -536,7 +536,7 @@ static void xemaclite_tx_timeout(struct net_device *dev, unsigned int txqueue)
 	xemaclite_enable_interrupts(lp);
 
 	if (lp->deferred_skb) {
-		dev_kfree_skb(lp->deferred_skb);
+		dev_consume_skb_irq(lp->deferred_skb);
 		lp->deferred_skb = NULL;
 		dev->stats.tx_errors++;
 	}
-- 
2.25.1

Re: [PATCH v2 resend 1/4] net: emaclite: don't call dev_kfree_skb() under spin_lock_irqsave()

[Harini Katakam]

On Thu, Dec 8, 2022 at 9:04 AM Yang Yingliang <yangyingliang@huawei.com> wrote:
>
> It is not allowed to call consume_skb() from hardware interrupt context
> or with interrupts being disabled. So replace dev_kfree_skb() with
> dev_consume_skb_irq() under spin_lock_irqsave().
>
> Fixes: bb81b2ddfa19 ("net: add Xilinx emac lite device driver")
> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>

Thanks for the patch Yang
Reviewed-by: Harini Katakam <harini.katakam@amd.com>

Regards,
Harini

[PATCH v2 resend 2/4] net: ethernet: dnet: don't call dev_kfree_skb() under spin_lock_irqsave()

[Yang Yingliang]

It is not allowed to call consume_skb() from hardware interrupt
context or with interrupts being disabled. So Call it after the
spin_unlock_irqrestore().

Fixes: 4796417417a6 ("dnet: Dave DNET ethernet controller driver (updated)")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
 drivers/net/ethernet/dnet.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/dnet.c b/drivers/net/ethernet/dnet.c
index 08184f20f510..151ca9573be9 100644
--- a/drivers/net/ethernet/dnet.c
+++ b/drivers/net/ethernet/dnet.c
@@ -550,11 +550,11 @@ static netdev_tx_t dnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	skb_tx_timestamp(skb);
 
+	spin_unlock_irqrestore(&bp->lock, flags);
+
 	/* free the buffer */
 	dev_kfree_skb(skb);
 
-	spin_unlock_irqrestore(&bp->lock, flags);
-
 	return NETDEV_TX_OK;
 }
 
-- 
2.25.1

[PATCH v2 resend 3/4] hamradio: don't call dev_kfree_skb() under spin_lock_irqsave()

[Yang Yingliang]

It is not allowed to call consume_skb() from hardware interrupt context
or with interrupts being disabled. So replace dev_kfree_skb() with
dev_consume_skb_irq() under spin_lock_irqsave().

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
 drivers/net/hamradio/scc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/hamradio/scc.c b/drivers/net/hamradio/scc.c
index f90830d3dfa6..bd80e8ca6c79 100644
--- a/drivers/net/hamradio/scc.c
+++ b/drivers/net/hamradio/scc.c
@@ -302,12 +302,12 @@ static inline void scc_discard_buffers(struct scc_channel *scc)
 	spin_lock_irqsave(&scc->lock, flags);	
 	if (scc->tx_buff != NULL)
 	{
-		dev_kfree_skb(scc->tx_buff);
+		dev_consume_skb_irq(scc->tx_buff);
 		scc->tx_buff = NULL;
 	}
 	
 	while (!skb_queue_empty(&scc->tx_queue))
-		dev_kfree_skb(skb_dequeue(&scc->tx_queue));
+		dev_consume_skb_irq(skb_dequeue(&scc->tx_queue));
 
 	spin_unlock_irqrestore(&scc->lock, flags);
 }
@@ -1668,7 +1668,7 @@ static netdev_tx_t scc_net_tx(struct sk_buff *skb, struct net_device *dev)
 	if (skb_queue_len(&scc->tx_queue) > scc->dev->tx_queue_len) {
 		struct sk_buff *skb_del;
 		skb_del = skb_dequeue(&scc->tx_queue);
-		dev_kfree_skb(skb_del);
+		dev_consume_skb_irq(skb_del);
 	}
 	skb_queue_tail(&scc->tx_queue, skb);
 	netif_trans_update(dev);
-- 
2.25.1

[PATCH v2 resend 4/4] net: amd: lance: don't call dev_kfree_skb() under spin_lock_irqsave()

[Yang Yingliang]

It is not allowed to call consume_skb() from hardware interrupt context
or with interrupts being disabled. So replace dev_kfree_skb() with
dev_consume_skb_irq() under spin_lock_irqsave().

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
 drivers/net/ethernet/amd/atarilance.c | 2 +-
 drivers/net/ethernet/amd/lance.c      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/amd/atarilance.c b/drivers/net/ethernet/amd/atarilance.c
index 3222c48ce6ae..ec704222925d 100644
--- a/drivers/net/ethernet/amd/atarilance.c
+++ b/drivers/net/ethernet/amd/atarilance.c
@@ -824,7 +824,7 @@ lance_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	lp->memcpy_f( PKTBUF_ADDR(head), (void *)skb->data, skb->len );
 	head->flag = TMD1_OWN_CHIP | TMD1_ENP | TMD1_STP;
 	dev->stats.tx_bytes += skb->len;
-	dev_kfree_skb( skb );
+	dev_consume_skb_irq(skb);
 	lp->cur_tx++;
 	while( lp->cur_tx >= TX_RING_SIZE && lp->dirty_tx >= TX_RING_SIZE ) {
 		lp->cur_tx -= TX_RING_SIZE;
diff --git a/drivers/net/ethernet/amd/lance.c b/drivers/net/ethernet/amd/lance.c
index fb8686214a32..8971665a4b2a 100644
--- a/drivers/net/ethernet/amd/lance.c
+++ b/drivers/net/ethernet/amd/lance.c
@@ -1001,7 +1001,7 @@ static netdev_tx_t lance_start_xmit(struct sk_buff *skb,
 		skb_copy_from_linear_data(skb, &lp->tx_bounce_buffs[entry], skb->len);
 		lp->tx_ring[entry].base =
 			((u32)isa_virt_to_bus((lp->tx_bounce_buffs + entry)) & 0xffffff) | 0x83000000;
-		dev_kfree_skb(skb);
+		dev_consume_skb_irq(skb);
 	} else {
 		lp->tx_skbuff[entry] = skb;
 		lp->tx_ring[entry].base = ((u32)isa_virt_to_bus(skb->data) & 0xffffff) | 0x83000000;
-- 
2.25.1

Re: [PATCH v2 resend 0/4] net: don't call dev_kfree_skb() under spin_lock_irqsave()

[Leon Romanovsky]

On Thu, Dec 08, 2022 at 11:26:51AM +0800, Yang Yingliang wrote:
> It is not allowed to call consume_skb() from hardware interrupt context
> or with interrupts being disabled. This patchset replace dev_kfree_skb()
> with dev_consume_skb_irq() under spin_lock_irqsave() in some drivers, or
> move dev_kfree_skb() after spin_unlock_irqrestore().

Like I said it to you already. You MUST explain why dev_consume_skb_irq()
was chosen over dev_kfree_skb_irq().

Thanks

> 
> Resend for CC all authors / reviewers of commits under "Fixes:".
> 
> v1 -> v2:
>   patch #2 Move dev_kfree_skb() after spin_unlock_irqrestore()
> 
> Yang Yingliang (4):
>   net: emaclite: don't call dev_kfree_skb() under spin_lock_irqsave()
>   net: ethernet: dnet: don't call dev_kfree_skb() under
>     spin_lock_irqsave()
>   hamradio: don't call dev_kfree_skb() under spin_lock_irqsave()
>   net: amd: lance: don't call dev_kfree_skb() under spin_lock_irqsave()
> 
>  drivers/net/ethernet/amd/atarilance.c         | 2 +-
>  drivers/net/ethernet/amd/lance.c              | 2 +-
>  drivers/net/ethernet/dnet.c                   | 4 ++--
>  drivers/net/ethernet/xilinx/xilinx_emaclite.c | 2 +-
>  drivers/net/hamradio/scc.c                    | 6 +++---
>  5 files changed, 8 insertions(+), 8 deletions(-)
> 
> -- 
> 2.25.1
>