linux-kernel - RE: [047/107] pxa168_eth: fix race in transmit path.

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Date:	Thu, 7 Jul 2011 23:20:03 -0700
From:	Sachin Sanap <ssanap@...vell.com>
To:	Greg KH <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...nel.org" <stable@...nel.org>
CC:	"stable-review@...nel.org" <stable-review@...nel.org>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"alan@...rguk.ukuu.org.uk" <alan@...rguk.ukuu.org.uk>,
	Zhangfei Gao <zgao6@...vell.com>,
	Philip Rakity <prakity@...vell.com>,
	Richard Cochran <richard.cochran@...cron.at>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: RE: [047/107] pxa168_eth: fix race in transmit path.

ACK.

> -----Original Message-----
> From: Greg KH [mailto:gregkh@...e.de]
> Sent: Friday, July 08, 2011 5:46 AM
> To: linux-kernel@...r.kernel.org; stable@...nel.org
> Cc: stable-review@...nel.org; torvalds@...ux-foundation.org; akpm@...ux-
> foundation.org; alan@...rguk.ukuu.org.uk; Sachin Sanap; Zhangfei Gao;
> Philip Rakity; Richard Cochran; Eric Dumazet; David S. Miller
> Subject: [047/107] pxa168_eth: fix race in transmit path.
> 
> 2.6.39-stable review patch.  If anyone has any objections, please let us
> know.
> 
> ------------------
> 
> From: Richard Cochran <richardcochran@...il.com>
> 
> commit 384420409d9b5d4443940abace49363d26135412 upstream.
> 
> Because the socket buffer is freed in the completion interrupt, it is not
> safe to access it after submitting it to the hardware.
> 
> Cc: Sachin Sanap <ssanap@...vell.com>
> Cc: Zhangfei Gao <zgao6@...vell.com>
> Cc: Philip Rakity <prakity@...vell.com>
> Signed-off-by: Richard Cochran <richard.cochran@...cron.at>
> Acked-by: Eric Dumazet <eric.dumazet@...il.com>
> Signed-off-by: David S. Miller <davem@...emloft.net>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
> 
> ---
>  drivers/net/pxa168_eth.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- a/drivers/net/pxa168_eth.c
> +++ b/drivers/net/pxa168_eth.c
> @@ -1273,7 +1273,7 @@ static int pxa168_eth_start_xmit(struct
>  	wmb();
>  	wrl(pep, SDMA_CMD, SDMA_CMD_TXDH | SDMA_CMD_ERD);
> 
> -	stats->tx_bytes += skb->len;
> +	stats->tx_bytes += length;
>  	stats->tx_packets++;
>  	dev->trans_start = jiffies;
>  	if (pep->tx_ring_size - pep->tx_desc_count <= 1) {
> 

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