linux-kernel - RE: [PATCH 38/40] Staging: hv: storvsc: Fixup srb_status for INQUIRY and MODE

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Message-ID: <6E21E5352C11B742B20C142EB499E0480816C27C@TK5EX14MBXC126.redmond.corp.microsoft.com>
Date:	Thu, 30 Jun 2011 19:59:28 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	"gregkh@...e.de" <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"virtualization@...ts.osdl.org" <virtualization@...ts.osdl.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	"Abhishek Kane (Mindtree Consulting PVT LTD)" 
	<v-abkane@...rosoft.com>, "Hank Janssen" <hjanssen@...rosoft.com>
Subject: RE: [PATCH 38/40] Staging: hv: storvsc: Fixup srb_status for
 INQUIRY and MODE_SENSE



> -----Original Message-----
> From: Christoph Hellwig [mailto:hch@...radead.org]
> Sent: Thursday, June 30, 2011 3:48 PM
> To: KY Srinivasan
> Cc: gregkh@...e.de; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; virtualization@...ts.osdl.org; Haiyang Zhang;
> Abhishek Kane (Mindtree Consulting PVT LTD); Hank Janssen
> Subject: Re: [PATCH 38/40] Staging: hv: storvsc: Fixup srb_status for INQUIRY and
> MODE_SENSE
> 
> On Wed, Jun 29, 2011 at 07:39:35AM -0700, K. Y. Srinivasan wrote:
> > The current handler on the Windows Host does not correctly handle
> > INQUIRY and MODE_SENSE commands with some options. Fixup srb_status
> > in these cases since the failure is not fatal.
> 
> > +	/*
> > +	 * The current SCSI handling on the host side does
> > +	 * not correctly handle:
> > +	 * INQUIRY command with page code parameter set to 0x80
> > +	 * MODE_SENSE command with cmd[2] == 0x1c
> > +	 *
> > +	 * Setup srb status so this won't be fatal.
> > +	 */
> > +
> > +	if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) ||
> > +	   (stor_pkt->vm_srb.cdb[0] == MODE_SENSE))
> > +		vstor_packet->vm_srb.srb_status = 0;
> 
> Given that the srb_status is only used for debug printks I don't
> quite see the point.  If people explicitly turn on debugging they
> should see that these commands fail, shouldn't they?
> 
The reason I did this was so that  I could key off  on real failures indicated by
srb_status == 0x4 to off-line the device.

Regards,

K. Y
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