linux-kernel - RE: [PATCH] usb-storage: scsiglue: Changing the command result

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Date:	Tue, 15 Oct 2013 16:22:03 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Vishal Annapurve <vannapurve@...dia.com>
cc:	Ming Lei <tom.leiming@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-usb <linux-usb@...r.kernel.org>
Subject: RE: [PATCH] usb-storage: scsiglue: Changing the command result

On Tue, 15 Oct 2013, Vishal Annapurve wrote:

> Hi Alan,
> 
> USB storage maybe just has to say that the abort occurred. By setting the
> US_FLIDX_TIMED_OUT bit USB storage is getting signaled that the reason was
> time out and the command is being aborted.

No.  By setting the US_FLIDX_TIMED_OUT bit, usb-storage indicates that
the command was aborted.  This doesn't indicate anything about the
reason for the abort.  (Maybe this bit's name wasn't chosen very well.)

> Now, it's arguable whether to change the implication of US_FLIDX_TIMED_OUT
> bit for scsi - USB storage bridge or for entire usb storage

I don't understand this.  What's the difference between "scsi - USB 
storage bridge" and "entire usb storage"?  Aren't they the same thing?

>  Or maybe scsi has
> decided to abort so it should override the result.

Of course the SCSI midlayer has decided to abort.  That's the only way 
this bit can get set.  But usb-storage doesn't know why SCSI decided to 
abort.

Alan Stern

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