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

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 [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

---

• Follow-Ups:
  • Re: [PATCH 2/2]: Spider ethernet driver -- protect chain head
    • From: [email protected] (Linas Vepstas)

• References:
  • [PATCH 1/2]: Spider ethernet driver spinlocks
    • From: [email protected] (Linas Vepstas)
  • [PATCH 2/2]: Spider ethernet driver -- protect chain head
    • From: [email protected] (Linas Vepstas)

• Prev by Date: Re: LibPATA code issues / 2.6.16 (previously, 2.6.15.x)
• Next by Date: Re: [RFC][PATCH 9/11] security: AppArmor - Audit changes
• Previous by thread: [PATCH 2/2]: Spider ethernet driver -- protect chain head
• Next by thread: Re: [PATCH 2/2]: Spider ethernet driver -- protect chain head
• Index(es):
  • Date
  • Thread

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]