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:   Fri, 21 Jul 2017 14:23:16 -0500
From:   Jason L Tibbitts III <tibbs@...h.uh.edu>
To:     Johannes Thumshirn <jthumshirn@...e.de>
Cc:     Doug Gilbert <dgilbert@...erlog.com>, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, dvyukov@...gle.com, hare@...e.com,
        hch@....de, martin.petersen@...cle.com, jth@...nel.org
Subject: Re: [REGRESSION] 28676d869bbb (scsi: sg: check for valid direction before starting the request) breaks mtx tape library control

>>>>> "JT" == Johannes Thumshirn <jthumshirn@...e.de> writes:

JT> Jason, can you try the above? If it works and Doug doesn't respond,
JT> I'm inclined yo submit this band aid.

Unfortunately it doesn't appear to work for me.  Maybe I'm building the
wrong thing, though.  I checked out 4.12, cherry picked
68c59fcea1f2c6a54c62aa896cc623c1b5bc9b47 and then applied your one liner
on top of that.  There appears to be no change in behavior:

[root@...kup2 ~]# mtx -f /dev/sg7 next 0
Unloading drive 0 into Storage Element 47...mtx: Request Sense: Long
Report=yes
mtx: Request Sense: Valid Residual=no
mtx: Request Sense: Error Code=0 (Unknown?!)
mtx: Request Sense: Sense Key=No Sense
mtx: Request Sense: FileMark=no
mtx: Request Sense: EOM=no
mtx: Request Sense: ILI=no
mtx: Request Sense: Additional Sense Code = 00
mtx: Request Sense: Additional Sense Qualifier = 00
mtx: Request Sense: BPV=no
mtx: Request Sense: Error in CDB=no
mtx: Request Sense: SKSV=no
MOVE MEDIUM from Element Address 1 to 1047 Failed

I can also apply the debugging patch and try again if that would give
you more useful information.

 - J<