netdev - Re: [PATCH 4/4] e1000: remove e1000_clean_tx_irq call from e1000

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Fri, 27 Jun 2008 02:08:53 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Andy Gospodarek <andy@...yhouse.net>
CC:	netdev@...r.kernel.org, jeffrey.t.kirsher@...el.com,
	jesse.brandeburg@...el.com
Subject: Re: [PATCH 4/4] e1000: remove e1000_clean_tx_irq call from e1000_netpoll

Andy Gospodarek wrote:
> The call to e1000_clean_tx_irq in e1000_netpoll can race with the call
> to e1000_clean_tx_irq in e1000_clean.  With a small bit of tweaking to
> to netpoll_send_skb to simulate a system that was under extreme stress,
> I was able to reproduce these concurrent calls.  This can result in
> multiple frees to the skbs on the tx ring buffer.
> 
> Dropping this call from e1000_netpoll should be fine since we can rely
> on the calls in e1000_clean to do what is needed since napi will poll
> the hardware just after calling poll_controller.
> 
> Signed-off-by: Andy Gospodarek <andy@...yhouse.net>
> ---
>  drivers/net/e1000/e1000_main.c |    1 -
>  1 files changed, 0 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
> index 0dc1ef0..047028f 100644
> --- a/drivers/net/e1000/e1000_main.c
> +++ b/drivers/net/e1000/e1000_main.c
> @@ -5277,7 +5277,6 @@ e1000_netpoll(struct net_device *netdev)
>  
>  	disable_irq(adapter->pdev->irq);
>  	e1000_intr(adapter->pdev->irq, netdev);
> -	e1000_clean_tx_irq(adapter, adapter->tx_ring);
>  #ifndef CONFIG_E1000_NAPI

applied (2.6.27)


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html