netdev - Re: [patch 2.6.29-rc8] dm9000 locking bugfix

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Date:	Sun, 22 Mar 2009 21:28:57 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	david-b@...bell.net
Cc:	netdev@...r.kernel.org
Subject: Re: [patch 2.6.29-rc8] dm9000 locking bugfix

From: David Brownell <david-b@...bell.net>
Date: Sun, 22 Mar 2009 16:12:12 -0700

> This fixes a locking bug in the dm9000 driver.  It calls
> request_irq() without setting IRQF_DISABLED ... which is
> correct for handlers that support IRQ sharing, since that
> behavior is not guaranteed for shared IRQs.  However, its
> IRQ handler then wrongly assumes that IRQs are blocked.
> So the fix just uses the right spinlock primitives in the
> IRQ handler.
> 
> NOTE:  this is a classic example of the type of bug which
> lockdep currently masks by forcibly setting IRQF_DISABLED
> on IRQ handlers that did not request that flag.
> 
> Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>

Applied, thanks.
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