Messages in this thread | | | Date | Fri, 21 Apr 2006 17:11:40 -0700 | From | Eugene Surovegin <> | Subject | Re: [PATCH 2/2]: Spider ethernet driver -- protect chain head |
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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
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