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Date: Thu, 23 Jul 2015 19:31:45 +0200 From: Nikolay Aleksandrov <nikolay@...ulusnetworks.com> To: Stephen Hemminger <stephen@...workplumber.org> Cc: netdev@...r.kernel.org, bridge@...ts.linux-foundation.org, davem@...emloft.net, Satish Ashok <sashok@...ulusnetworks.com> Subject: Re: [PATCH net] bridge: stp: when using userspace stp stop kernel hello and hold timers On 07/23/2015 07:13 PM, Stephen Hemminger wrote: > On Thu, 23 Jul 2015 19:05:56 +0200 > Nikolay Aleksandrov <nikolay@...ulusnetworks.com> wrote: > >> On 07/23/2015 06:59 PM, Stephen Hemminger wrote: >>> On Thu, 23 Jul 2015 09:07:37 -0700 >>> Nikolay Aleksandrov <nikolay@...ulusnetworks.com> wrote: >>> >>>> + /* Stop hello and hold timer */ >>>> + spin_lock_bh(&br->lock); >>>> + del_timer(&br->hello_timer); >>>> + list_for_each_entry(p, &br->port_list, list) >>>> + del_timer(&p->hold_timer); >>>> + spin_unlock_bh(&br->lock); >>> >>> Wouldn't it be easier to use del_timer_sync here? >>> >> I think it should work. Also I have an error in the commit message >> about the kernel BPDU sending which I need to correct. I'll prepare >> a v2 with your suggestion and fixed commit message. > > The one thing to watch out for with del_timer_sync is that > the timer routine and the caller can't be using the same lock > otherwise timer will be spinning waiting to get lock that > is held by caller who is waiting for timer. > Actually I just noticed the locking was wrong in the patch, also we should use del_timer() only because a spin_lock is acquired before that and cannot use the blocking del_timer_sync() inside. I'll fix it all up in the second version. -- 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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