Messages in this thread | | | Date | Fri, 21 Apr 2006 20:03:21 -0500 | Subject | Re: [PATCH 2/2]: Spider ethernet driver -- protect chain head | From | (Linas Vepstas) |
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On Fri, Apr 21, 2006 at 05:11:40PM -0700, Eugene Surovegin wrote: > 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
Ahh, thank you. I was wondering why I never semmed to see this this happen in "real life".
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