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Date: Thu, 01 Jul 2010 16:21:35 -0700 From: Jeff Kirsher <jeffrey.t.kirsher@...el.com> To: davem@...emloft.net Cc: netdev@...r.kernel.org, gospo@...hat.com, bphilips@...ell.com, John Fastabend <john.r.fastabend@...el.com>, Jeff Kirsher <jeffrey.t.kirsher@...el.com> Subject: [net-2.6 PATCH 1/2] sched: qdisc_reset_all_tx is calling qdisc_reset without qdisc_lock From: John Fastabend <john.r.fastabend@...el.com> When calling qdisc_reset() the qdisc lock needs to be held. In this case there is at least one driver i4l which is using this without holding the lock. Add the locking here. Signed-off-by: John Fastabend <john.r.fastabend@...el.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com> --- include/net/sch_generic.h | 12 ++++++++++-- 1 files changed, 10 insertions(+), 2 deletions(-) diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h index 03ca5d8..ba749be 100644 --- a/include/net/sch_generic.h +++ b/include/net/sch_generic.h @@ -317,8 +317,16 @@ extern void tcf_destroy_chain(struct tcf_proto **fl); static inline void qdisc_reset_all_tx(struct net_device *dev) { unsigned int i; - for (i = 0; i < dev->num_tx_queues; i++) - qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc); + struct Qdisc *qdisc; + + for (i = 0; i < dev->num_tx_queues; i++) { + qdisc = netdev_get_tx_queue(dev, i)->qdisc; + if (qdisc) { + spin_lock_bh(qdisc_lock(qdisc)); + qdisc_reset(qdisc); + spin_unlock_bh(qdisc_lock(qdisc)); + } + } } /* Are all TX queues of the device empty? */ -- 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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