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Date: Fri, 9 Feb 2007 18:22:05 -0600 From: linas@...tin.ibm.com (Linas Vepstas) To: jgarzik@...ox.com Cc: linuxppc-dev@...abs.org, netdev@...r.kernel.org, James K Lewis <jklewis@...ibm.com>, Jens Osterkamp <Jens.Osterkamp@...ibm.com>, Kou Ishizaki <kou.ishizaki@...hiba.co.jp> Subject: [PATCH 4/5]: spidernet: transmit race Multiple threads performing a transmit can race into the spidernet tx ring cleanup code. This puts the relevant check under a lock. Signed-off-by: Linas Vepstas <lins@...tin.ibm.com> Cc: James K Lewis <jklewis@...ibm.com> Cc: Jens Osterkamp <Jens.Osterkamp@...ibm.com> Cc: Kou Ishizaki <kou.ishizaki@...hiba.co.jp> ---- drivers/net/spider_net.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) Index: linux-2.6.20-git4/drivers/net/spider_net.c =================================================================== --- linux-2.6.20-git4.orig/drivers/net/spider_net.c 2007-02-09 17:30:13.000000000 -0600 +++ linux-2.6.20-git4/drivers/net/spider_net.c 2007-02-09 17:37:41.000000000 -0600 @@ -767,8 +767,12 @@ spider_net_release_tx_chain(struct spide unsigned long flags; int status; - while (chain->tail != chain->head) { + while (1) { spin_lock_irqsave(&chain->lock, flags); + if (chain->tail == chain->head) { + spin_unlock_irqrestore(&chain->lock, flags); + return 0; + } descr = chain->tail; hwdescr = descr->hwdescr; - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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