Re: [PATCH/RFC] remove irqs_disabled warning from local_bh_enable

David Miller
2008-06-17T23:12:30Z

From: Johannes Berg <johannes@sipsolutions.net>
Date: Tue, 17 Jun 2008 23:57:14 +0200

> This warning has started to trigger with mac80211 because it can, under
> some circumstances, use spin_lock_bh() protected sections within
> irq-disabled sections. Is that a bug?

It is a bug. The only legal nesting is base --> BH --> IRQ locking.

> Also, if you're going to treat IRQs being enabled as a bug, there's no
> point in disabling them right afterwards, is there?

It's treating IRQs being "disabled" as a bug. It expects them to
be enabled, always.

> If you're going to reject this patch, I'll post one that adds the
> warning to local_bh_enable_ip() to allow detecting this for everybody
> and not just those poor people running UP/NO-PREEMPT :)

That might be useful :)