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| author | Linas Vepstas <linas@austin.ibm.com> | 2007-02-20 16:41:59 -0600 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2007-02-27 04:16:03 -0500 |
| commit | 5c8e98fe4742734c1c6b81699a86d1f5b03841e0 (patch) | |
| tree | 6a93ccce6f545da153bc937548bc6fe1db1e99ab | |
| parent | d9c199ee781fa874e6feb4c56ae3d0e19f7f82a6 (diff) | |
| download | linux-5c8e98fe4742734c1c6b81699a86d1f5b03841e0.tar.gz linux-5c8e98fe4742734c1c6b81699a86d1f5b03841e0.tar.bz2 linux-5c8e98fe4742734c1c6b81699a86d1f5b03841e0.zip | |
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@austin.ibm.com>
Cc: Jens Osterkamp <Jens.Osterkamp@de.ibm.com>
Cc: Kou Ishizaki <kou.ishizaki@toshiba.co.jp>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
| -rw-r--r-- | drivers/net/spider_net.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/net/spider_net.c b/drivers/net/spider_net.c index 15b0bcaec467..653a91adacc7 100644 --- a/drivers/net/spider_net.c +++ b/drivers/net/spider_net.c @@ -803,8 +803,12 @@ spider_net_release_tx_chain(struct spider_net_card *card, int brutal) 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; |