Re: [PATCH 2/2]: Spider ethernet driver -- protect chain head

[Eugene Surovegin]

On Fri, Apr 21, 2006 at 06:45:51PM -0500, Linas Vepstas wrote:
> Prevent a potential race. If two threads are both calling
> the transmit routine, both can potentially try to grab the
> same dma descriptor. Serialize access to the head of the
> tx ring with spinlocks.

Two threads cannot be in spider_net_xmit() simultaneosuly because 
hard_start_xmit entry point is already protected by net_device 
xmit_lock, see Documentation/net/netdevices.txt

-- 
Eugene

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/