linux-kernel - Re: [Patch net-next-2.6] netpoll: disable netpoll when enslave a device

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Message-ID: <20110519110314.GC2723@hmsreliant.think-freely.org>
Date:	Thu, 19 May 2011 07:03:14 -0400
From:	Neil Horman <nhorman@...hat.com>
To:	Cong Wang <amwang@...hat.com>
Cc:	Neil Horman <nhorman@...driver.com>, linux-kernel@...r.kernel.org,
	Jay Vosburgh <fubar@...ibm.com>,
	Andy Gospodarek <andy@...yhouse.net>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Ferenc Wagner <wferi@...f.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Josh Triplett <josh@...htriplett.org>,
	Ian Campbell <ian.campbell@...rix.com>, netdev@...r.kernel.org
Subject: Re: [Patch net-next-2.6] netpoll: disable netpoll when enslave a
 device

On Thu, May 19, 2011 at 01:13:29PM +0800, Cong Wang wrote:
> 于 2011年05月18日 18:56, Neil Horman 写道:
> >On Wed, May 18, 2011 at 06:00:35PM +0800, Amerigo Wang wrote:
> ...
> >>-			case NETDEV_GOING_DOWN:
> >>  			case NETDEV_BONDING_DESLAVE:
> >>+			case NETDEV_ENSLAVE:
> >>  				nt->enabled = 0;
> >>  				stopped = true;
> >>  				break;
> >This wasn't introduced by this patch, but looking at it made me realize that
> >nt->enabled, if it passes through this code path, doesn't properly track weather
> >or not netpoll_setup has been called on this interface.  If you look at
> >drop_netconsole_target, you'll see we only call netpoll_cleanup_target if
> >nt->enabled is set.  We should probably change the nt->enabled check there, and
> >in store_enabled to be if (nt->np.dev), like we do in the NETDEV_UNREGISTER case
> >in netconsole_netdev_event.
> 
> Yeah, also note that we can change ->enabled via configfs too.
> I guess we probably need to fix this in another patch...
> 
Yeah, or you can roll it into this one, I think this is the only location that
needs fixing.

> 
> >>+#define NETDEV_ENSLAVE		0x0014
> >>
> >Nit:
> >Shouldn't this be NETDEV_BONDING_ENSLAVE, to keep it in line with
> >NETDEV_BONDING_DESLAVE above?
> 
> Actually that is my first thought, but I plan to use this in bridge
> case too, because using netconsole on a device underlying a bridge
> makes little sense too. Thus, I prefer NETDEV_ENSLAVE to
> NETDEV_BONDING_ENSLAVE.
> 
That seems reasonable, but if its going to be more generic, could you change
NETDEV_BONDING_DESLAVE to NETDEV_DESLAVE?

> >
> >>  #define SYS_DOWN	0x0001	/* Notify of system down */
> >>  #define SYS_RESTART	SYS_DOWN
> >>
> >
> >
> >Other than those two points, this looks good to me
> 
> Thanks for review.
Thank you!

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