linux-kernel - RE: [PATCH 3/4] [SCSI]stex: fix reset recovery for console device

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Date:	Mon, 2 Apr 2007 11:14:56 -0700
From:	"Ed Lin" <ed.lin@...mise.com>
To:	"James Bottomley" <James.Bottomley@...elEye.com>
Cc:	"linux-scsi" <linux-scsi@...r.kernel.org>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"jeff" <jeff@...zik.org>,
	"Promise_Linux" <Promise_Linux@...mise.com>
Subject: RE: [PATCH 3/4] [SCSI]stex: fix reset recovery for console device



> -----Original Message-----
> From: James Bottomley [mailto:James.Bottomley@...elEye.com] 
> Sent: Saturday, March 31, 2007 11:46 AM
> To: Ed Lin
> Cc: linux-scsi; linux-kernel; jeff; Promise_Linux
> Subject: Re: [PATCH 3/4] [SCSI]stex: fix reset recovery for 
> console device
> 
> 
> On Fri, 2007-03-30 at 15:21 -0700, Ed Lin wrote:
> > After reset completed, the scsi error handler sends out START_STOP
> > and TEST_UNIT_READY to the device. For 'normal' devices these
> > commands will be handled by firmware. However, because the RAID
> > console only interfaces to scsi mid layer, the firmware 
> will not process
> > these commands for it. This will make the console to be 
> offlined right
> > after reset. Add the handling in driver to fix this problem.
> 
> I don't see how this explanation can be correct.  The error 
> handler only
> sends a START_STOP command if sdev->allow_restart is one, 
> which you have
> to set in the slave_configure routines (which stex doesn't).  
> If you're
> seeing a START_STOP in the eh path, there's something else wrong.
> TEST_UNIT_READY, certainly ... it's part of a restart check.
> 

I just saw the routine name scsi_eh_try_stu, and didn't notice the
allow_restart (partly because I thought it was not harmful...).
But the TEST_UNIT_READY must stay.
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