linux-kernel - Re: [GIT PULL] SCSI bug fixes for 2.6.36-rc7

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Message-ID: <1287016477.10264.418.camel@mulgrave.site>
Date:	Wed, 13 Oct 2010 20:34:37 -0400
From:	James Bottomley <James.Bottomley@...e.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] SCSI bug fixes for 2.6.36-rc7

On Wed, 2010-10-13 at 20:24 -0400, James Bottomley wrote:
> On Wed, 2010-10-13 at 16:49 -0700, Linus Torvalds wrote:
> > On Wed, Oct 13, 2010 at 6:45 AM, James Bottomley
> > <James.Bottomley@...e.de> wrote:
> > > This patch set fixes a couple of longstanding bugs in SCSI.  The VPD
> > > patch fix a possible buffer overrun in the VPD code (only tripped if the
> > > device has a huge number of VPD pages).  The other is where the status
> > > return code on our BSG interface is wrongly right shifted one place.
> > 
> > Umm. That other patch seems to be utter crap.
> > 
> > > -       hdr->device_status = status_byte(rq->errors);
> > > +       hdr->device_status = rq->errors && 0xff;
> > 
> > That's pure shit. Please look at it for one second, and don't send me
> > crap like this.
> 
> What's wrong with it? device_status() is an ancient SCSI-1 macro that
> dates from the time the status was left shifted by 1, which makes the
> value wrong according to the sg interface spec.  We should really remove
> it, but there's still a few ancient drivers using it.  the SG interface
> requires the full status byte, which is what the bottom most byte of
> req_errors is ... hence the change.

OK, right ... several people pointed out in private email that it was &&
not & ... I'll fix it when I'm slightly less jet lagged.

James


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