linux-kernel - Re: [REGRESSION] 28676d869bbb (scsi: sg: check for valid direction before starting the request) breaks mtx tape library control

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Date:   Tue, 18 Jul 2017 09:37:47 +0200
From:   Johannes Thumshirn <jthumshirn@...e.de>
To:     Jason L Tibbitts III <tibbs@...h.uh.edu>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        dvyukov@...gle.com, hare@...e.com, hch@....de,
        martin.petersen@...cle.com
Subject: Re: [REGRESSION] 28676d869bbb (scsi: sg: check for valid direction
 before starting the request) breaks mtx tape library control

On Mon, Jul 17, 2017 at 07:44:50PM -0500, Jason L Tibbitts III wrote:
> and confirmed that clean unpatched 4.12 shows the problem, while
> reverting just that patch fixes the issue.  Unfortunately I don't know
> enough to actually fix this, but I can easily test patches.

This is fixed with:
commit 68c59fcea1f2c6a54c62aa896cc623c1b5bc9b47
Author: Johannes Thumshirn <jthumshirn@...e.de>
Date:   Fri Jul 7 10:56:38 2017 +0200

    scsi: sg: fix SG_DXFER_FROM_DEV transfers
    
    SG_DXFER_FROM_DEV transfers do not necessarily have a dxferp as we set
    it to NULL for the old sg_io read/write interface, but must have a
    length bigger than 0. This fixes a regression introduced by commit
    28676d869bbb ("scsi: sg: check for valid direction before starting the
    request")
    
    Signed-off-by: Johannes Thumshirn <jthumshirn@...e.de>
    Fixes: 28676d869bbb ("scsi: sg: check for valid direction before starting the request")
    Reported-by: Chris Clayton <chris2553@...glemail.com>
    Tested-by: Chris Clayton <chris2553@...glemail.com>
    Cc: Douglas Gilbert <dgilbert@...erlog.com>
    Reviewed-by: Hannes Reinecke <hare@...e.com>
    Tested-by: Chris Clayton <chris2553@...glemail.com>
    Acked-by: Douglas Gilbert <dgilbert@...erlog.com>
    Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>


-- 
Johannes Thumshirn                                          Storage
jthumshirn@...e.de                                +49 911 74053 689
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