netdev - Re: BUG in netxen_release_tx_buffers when TSO enabled on kernels >= 3.3 and <= 3.6

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Date:	Tue, 22 Jan 2013 16:03:59 +0100
From:	Christoph Paasch <christoph.paasch@...ouvain.be>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Ian Campbell <Ian.Campbell@...rix.com>,
	Sony Chacko <sony.chacko@...gic.com>,
	Rajesh Borundia <rajesh.borundia@...gic.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: BUG in netxen_release_tx_buffers when TSO enabled on kernels >= 3.3 and <= 3.6

On Tuesday 22 January 2013 05:56:06 Eric Dumazet wrote:
> I guess netxen driver has a bug.
> 
> Please try the following patch :
> 
> diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
> b/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c index
> bc165f4..695667d 100644
> --- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
> +++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
> @@ -144,7 +144,7 @@ void netxen_release_tx_buffers(struct netxen_adapter
> *adapter) buffrag->length, PCI_DMA_TODEVICE); buffrag->dma = 0ULL;
>                 }
> -               for (j = 0; j < cmd_buf->frag_count; j++) {
> +               for (j = 1; j < cmd_buf->frag_count; j++) {
>                         buffrag++;
>                         if (buffrag->dma) {
>                                 pci_unmap_page(adapter->pdev, buffrag->dma,

Perfect, I tested it, and this fixes the bug.

I should have found it on my own, I have been starring for too long at this 
function... :)

Feel free to add
Tested-by: Christoph Paasch <christoph.paasch@...ouvain.be>


Thanks, Eric!


Christoph


-- 
IP Networking Lab --- http://inl.info.ucl.ac.be
MultiPath TCP in the Linux Kernel --- http://mptcp.info.ucl.ac.be
UCLouvain
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