linux-kernel - RE: mpt2sas stuck installing

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Date:	Sat, 12 Jul 2014 03:13:07 +0000
From:	"Elliott, Robert (Server Storage)" <Elliott@...com>
To:	Joe Lawrence <joe.lawrence@...atus.com>,
	Joe Julian <joe@...ianfamily.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	Sreekanth Reddy <sreekanth.reddy@...gotech.com>,
	Nagalakshmi Nandigama <nagalakshmi.nandigama@...gotech.com>,
	Joe Maloy <joe.maloy@...gotech.com>
Subject: RE: mpt2sas stuck installing



> -----Original Message-----
> From: linux-scsi-owner@...r.kernel.org [mailto:linux-scsi-
> owner@...r.kernel.org] On Behalf Of Joe Lawrence
...
> In your crash stack trace, the scsi error handler has issued a host
> reset, but then crashed in mpt2sas_base_get_iocstate.  Reading through
> _scsih_shutdown, I don't believe that the mpt2sas .shutdown path takes
> any precaution before heading down mpt2sas_base_detach to free adapter
> resources.  The ordinary .remove path looks similar, though it does
> call sas_remove_host before freeing resources, *then* scsi_remove_host
> and scsi_host_put.
> 
> I wonder if this ordering needs to be reversed (and added to
> _scsih_shutdown) to properly de-register from the SCSI midlayer prior
> to removing the controller instance.
> 
> Regards,
> 
> -- Joe

Nagalakshmi was working on an mpt3sas patch for the scsi-mq tree 
to do just that.  I don't recall if the patch has made it into the 
scsi-mq tree yet. Apparently it's also needed for non-mq and mpt2sas.

It is making this change:
>  	sas_remove_host(shost);
> +	scsi_remove_host(shost);
>  	mpt3sas_base_detach(ioc);
>  	list_del(&ioc->list);
> -	scsi_remove_host(shost);
>  	scsi_host_put(shost);

We are making a similar change in hpsa.  Doing so led to a general 
protection fault, which unveiled that we also needed to change 
cancel_delayed_work() calls to cancel_delayed_work_sync() to 
ensure there are no worker functions still active after the 
scsi_host structure is unregistered.


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