Re: [RFC PATCH] isci: filter broadcast change notifications during SMP phy resets

[James Bottomley <James.Bottomley@HansenPartnership.com>]

On Mon, 2011-06-27 at 16:34 +0200, Hannes Reinecke wrote:
> On 06/24/2011 09:48 PM, Dan Williams wrote:
> > From: Jeff Skirvin<jeffrey.d.skirvin@intel.com>
> >
> > When resetting a sata device in the domain we have seen occasions where
> > libsas prematurely marks a device gone in the time it takes for the
> > device to re-establish the link.  This plays badly with software raid
> > arrays.  Other libsas drivers have non-uniform delays in their reset
> > handlers to try to cover this condition, but not sufficient to close the
> > hole.  Given that a sata device can take many seconds to recover we
> > filter bcns and poll for the device reattach state before notifying
> > libsas that the port needs the domain to be rediscovered.  Once this has
> > been proven out at the lldd level we can think about uplevelling this
> > feature to a common implementation in libsas.
> >
> That's the second time something like this have come up now.
> Wouldn't it makes sense to implement something like the dev_loss_tmo 
> mechanism with have for FC? That should cover this situation nicely ...

It's certainly what we agreed to at LSF, yes, so it looks like a good
idea.

James