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 05:56:06 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	christoph.paasch@...ouvain.be
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 Tue, 2013-01-22 at 05:32 -0800, Eric Dumazet wrote:

> 
> Something doesn't properly test MAX_SKB_FRAGS, we should track it and
> fix.

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,


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