linux-kernel - RE: [PATCH 7/8] drivers: scsi: storvsc: Set srb

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Message-ID: <f7789b309ce84187b64760e3885f7cfa@BY2PR03MB299.namprd03.prod.outlook.com>
Date:	Fri, 11 Jul 2014 21:03:52 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"ohering@...e.com" <ohering@...e.com>,
	"jbottomley@...allels.com" <jbottomley@...allels.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"apw@...onical.com" <apw@...onical.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH 7/8] drivers: scsi: storvsc: Set srb_flags in all cases



> -----Original Message-----
> From: Christoph Hellwig [mailto:hch@...radead.org]
> Sent: Thursday, July 10, 2014 3:19 AM
> To: KY Srinivasan
> Cc: linux-kernel@...r.kernel.org; devel@...uxdriverproject.org;
> ohering@...e.com; jbottomley@...allels.com; jasowang@...hat.com;
> apw@...onical.com; linux-scsi@...r.kernel.org; stable@...r.kernel.org
> Subject: Re: [PATCH 7/8] drivers: scsi: storvsc: Set srb_flags in all cases
> 
> >  	default:
> >  		vm_srb->data_in = UNKNOWN_TYPE;
> > -		vm_srb->win8_extension.srb_flags = 0;
> > +		vm_srb->win8_extension.srb_flags |=
> (SRB_FLAGS_DATA_IN |
> > +						     SRB_FLAGS_DATA_OUT);
> 
> This would usually be a command that doesn't transfer data (e.g.
> TEST_UNIT_READY or SYNCHRONIZE_CACHE), do you really want to set the in
> and out flags here?

On the host, before they forward the command to the native driver stack, I am told they validate that the flags be correctly set because of some bugs in the Emulex driver.

K. Y
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