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

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Date:	Tue, 15 Oct 2013 23:23:50 +0530
From:	Vishal Annapurve <vannapurve@...dia.com>
To:	Alan Stern <stern@...land.harvard.edu>
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

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.

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

Regards,
Vishal

-----Original Message-----
From: Alan Stern [mailto:stern@...land.harvard.edu] 
Sent: Tuesday, October 15, 2013 7:03 PM
To: Vishal Annapurve
Cc: Ming Lei; Linux Kernel Mailing List; linux-usb
Subject: RE: [PATCH] usb-storage: scsiglue: Changing the command result

On Tue, 15 Oct 2013, Vishal Annapurve wrote:

> Hi Alan,
> 
> This issue seems more related to the devices using SCSI protocol and 
> the changes otherwise will be at more places giving the same end result.
> 
> I think as the comment says over the command_abort function, 
> intentional result change should only happen in case of timeout.

usb-storage doesn't know _why_ a command was aborted; it knows only that the abort occurred.

If you look carefully at the code, you'll see that the result is set to DID_ABORT only when the US_FLIDX_TIMED_OUT bit is set, and this bit gets set only when a SCSI abort occurs.

Alan Stern

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