[PATCH] [v2] virtio_net: Remove BUG() to avoid machine dead

[PATCH] [v2] virtio_net: Remove BUG() to avoid machine dead

[Xianting Tian]

From: Xianting Tian <xianting.tian@linux.alibaba.com>

We should not directly BUG() when there is hdr error, it is
better to output a print when such error happens. Currently,
the caller of xmit_skb() already did it.

Signed-off-by: Xianting Tian <xianting.tian@linux.alibaba.com>
---
 drivers/net/virtio_net.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 9b6a4a8..7f11ea4 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1623,7 +1623,7 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
 	if (virtio_net_hdr_from_skb(skb, &hdr->hdr,
 				    virtio_is_little_endian(vi->vdev), false,
 				    0))
-		BUG();
+		return -EPROTO;
 
 	if (vi->mergeable_rx_bufs)
 		hdr->num_buffers = 0;
-- 
1.8.3.1

Re: [PATCH] [v2] virtio_net: Remove BUG() to avoid machine dead

[Leon Romanovsky]

On Sat, Jun 05, 2021 at 11:31:00AM -0400, Xianting Tian wrote:
> From: Xianting Tian <xianting.tian@linux.alibaba.com>
> 
> We should not directly BUG() when there is hdr error, it is
> better to output a print when such error happens. Currently,
> the caller of xmit_skb() already did it.
> 
> Signed-off-by: Xianting Tian <xianting.tian@linux.alibaba.com>
> ---
>  drivers/net/virtio_net.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 9b6a4a8..7f11ea4 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1623,7 +1623,7 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
>  	if (virtio_net_hdr_from_skb(skb, &hdr->hdr,
>  				    virtio_is_little_endian(vi->vdev), false,
>  				    0))
> -		BUG();
> +		return -EPROTO;

Yeah, as we discussed, BUG*() macros in non-core code that checks
in-kernel API better to be deleted.

Thanks,
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>

Re: [PATCH] [v2] virtio_net: Remove BUG() to avoid machine dead

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net-next.git (refs/heads/master):

On Sat,  5 Jun 2021 11:31:00 -0400 you wrote:
> From: Xianting Tian <xianting.tian@linux.alibaba.com>
> 
> We should not directly BUG() when there is hdr error, it is
> better to output a print when such error happens. Currently,
> the caller of xmit_skb() already did it.
> 
> Signed-off-by: Xianting Tian <xianting.tian@linux.alibaba.com>
> 
> [...]

Here is the summary with links:
  - [v2] virtio_net: Remove BUG() to avoid machine dead
    https://git.kernel.org/netdev/net-next/c/85eb1389458d

You are awesome, thank you!
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