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Re: [PATCH 3.5] mac80211: flush off-channel work when interface goes down

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On Thu, 2012-05-31 at 09:07 +0300, Eliad Peller wrote:
> On Wed, May 30, 2012 at 4:57 PM, Eliad Peller <eliad@xxxxxxxxxx> wrote:
> > On Wed, May 30, 2012 at 4:50 PM, Johannes Berg
> > <johannes@xxxxxxxxxxxxxxxx> wrote:
> >> On Wed, 2012-05-30 at 16:44 +0300, Eliad Peller wrote:
> >>> On Wed, May 30, 2012 at 4:16 PM, Johannes Berg
> >>> <johannes@xxxxxxxxxxxxxxxx> wrote:
> >>> > When any interface goes down, it could be the one that
> >>> > we were doing off-channel with. Thus, we need to flush
> >>> > the offchannel start/stop work so they can't run when
> >>> > the interface has already been removed from the driver
> >>> > or even been destroyed. It's OK to flush them even if
> >>> > they were for another interface, that just means that
> >>> > we potentially delay the interface down a little bit.
> >>> >
> >>> can't we check hw_roc_dev?
> >>
> >> We could, but it didn't seem worthwhile. Think I should do that instead?
> >>
> > hmm... i guess it doesn't really matter :)
> >
> just gave it a second thought - the driver might have not even called
> ieee80211_ready_on_channel() yet, so i think it's still racy.

Hmmm. Good point. For some reason I thought that wouldn't happen, but I
guess you're right.

I'll need to think more about how we can fix that though. Maybe cfg80211
could request a cancel when the corresponding interface goes down?

johannes

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