linux-kernel - Re: BUG in VFS or block layer

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Date:	Thu, 7 Aug 2008 10:17:04 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	linux-kernel@...r.kernel.org, <ospite@...denti.unina.it>,
	<matthew@....cx>, <nickpiggin@...oo.com.au>
Subject: Re: BUG in VFS or block layer

On Wed, 6 Aug 2008, Andrew Morton wrote:

> > > So...  would you be able to verify that the USB, layer is correctly
> > > calling bio->bi_end_io() for the offending requests?
> > 
> > The USB layer doesn't handle that; the SCSI layer takes care of it.  
> > Possibly the I/O error confuses the code in and around 
> > scsi_end_request().  I'll have to do some testing to find out.
> > 
> 
> Well...  looking at your patch to
> drivers/usb/gadget/file_storage.c:do_read(), it appears that
> do_scsi_command() just drops do_read()'s error code on the floor rather
> than returning it to the scsi layer?

No, you misunderstand.  file_storage.c is a peripheral driver, not a
host device driver.  It doesn't communicate directly with the SCSI
layer and it doesn't handle any BIO requests.  You're thinking of
usb-storage, not file_storage.

Alan Stern

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