netdev - Re: [PATCH] sis900: Allocate rx replacement buffer before rx operation

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Message-ID: <462E33A8.5060107@garzik.org>
Date:	Tue, 24 Apr 2007 12:43:20 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Neil Horman <nhorman@...driver.com>
CC:	netdev@...r.kernel.org, davem@...emloft.net, venza@...wnhat.org
Subject: Re: [PATCH] sis900: Allocate rx replacement buffer before rx operation

Neil Horman wrote:
> Hey there-
> 	The sis900 driver appears to have a bug in which the receive routine
> passes the skbuff holding the received frame to the network stack before
> refilling the buffer in the rx ring.  If a new skbuff cannot be allocated, the
> driver simply leaves a hole in the rx ring, which causes the driver to stop
> receiving frames and become non-recoverable without an rmmod/insmod according to
> reporters.  This patch reverses that order, attempting to allocate a replacement
> buffer first, and receiving the new frame only if one can be allocated.  If no
> skbuff can be allocated, the current skbuf in the rx ring is recycled, dropping
> the current frame, but keeping the NIC operational.
> 
> Thanks & Regards
> Neil
> 
> Signed-off-by: Neil Horman <nhorman@...driver.com>
> 
> 
>  sis900.c |   44 ++++++++++++++++++++------------------------
>  1 file changed, 20 insertions(+), 24 deletions(-)

applied


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