netdev - Re: [PATCH] starfire: Clean up properly if firmware loading fails

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Date:	Tue, 26 Jan 2010 02:32:48 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	netdev@...r.kernel.org, bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org, michael@...fatt.org.nz,
	Alan Cox <alan@...rguk.ukuu.org.uk>, stable@...nel.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] starfire: Clean up properly if firmware loading fails

On Mon, 2010-01-25 at 18:15 -0800, Andrew Morton wrote:
> On Tue, 26 Jan 2010 02:02:12 +0000 Ben Hutchings <bhutchings@...arflare.com> wrote:
> 
> > netdev_open() will return without cleaning up net device or hardware
> > state if firmware loading fails.  This results in a BUG() on a second
> > attempt to bring the interface up, reported in
> > <http://bugzilla.kernel.org/show_bug.cgi?id=15117>, and probably has
> > even worse effects if the driver is removed afterwards.
> 
> (That's the wrong bugzilla URL)

Hah, well spotted.  Must have copied from the wrong tab.

> > Call netdev_close() to clean up on failure.
> 
> OK, thanks.
> 
> > ---
> > On Mon, 2010-01-25 at 17:08 -0800, Andrew Morton wrote: 
> > > (switched to email.  Please respond via emailed reply-to-all, not via the
> > > bugzilla web interface).
> > > 
> > > On Wed, 20 Jan 2010 04:29:20 GMT
> > > bugzilla-daemon@...zilla.kernel.org wrote:
> > > 
> > > > http://bugzilla.kernel.org/show_bug.cgi?id=15091
> > > > 
> > > >            Summary: starfire causes kernel BUG when interface goes up
> > [...] 
> > > > I formerly used 2.6.20 and 2.6.24 with a couple of starfire 4 port ethernet
> > > > cards. On 2.6.32 the interfaces don't start on boot and when I issue "ifconfig
> > > > ethX up" (where X is a starfire port).
> > [...] 
> > > Starfire is triggering the BUG_ON(!test_bit(NAPI_STATE_SCHED,
> > > &n->state)); in napi_enable().
> > > 
> > > This is a regression somewhere between 2.6.24 and 2.6.32(!).
> > 
> > This driver now attempts to load firmware when an interface is brought
> > up, *after* calling napi_enable().  If that fails, it will return
> > without calling napi_disable().  On the second attempt to bring the
> > interface it calls napi_enable() a second time and triggers this
> > assertion.
> > 
> > As a workaround, try installing the necessary firmware. :-)
> > 
> 
> Missing signed-off-by.  I added it, OK?  Also added a Cc:stable.
[...]

Well I was going to wait and see what the submitter says first, but I'm
happy for you to add that in your patch set if it's a positive result.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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