From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: [REGRESSION 3.17] scsi (uas) disks no longer using tagged command queuing Date: Thu, 11 Sep 2014 09:13:31 -0700 Message-ID: <20140911161331.GA24488@infradead.org> References: <540EC52C.3000804@redhat.com> <20140909152730.GA17882@infradead.org> <540FFBF4.9090001@redhat.com> <20140910154535.GA5102@infradead.org> <541172E9.8070309@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <541172E9.8070309@redhat.com> Sender: linux-kernel-owner@vger.kernel.org To: Hans de Goede Cc: Christoph Hellwig , linux-usb , SCSI development list , Linux Kernel Mailing List List-Id: linux-scsi@vger.kernel.org On Thu, Sep 11, 2014 at 12:01:13PM +0200, Hans de Goede wrote: > > So we're initializing the tag map, but scsi_activate_tcq doesn't pick it > > up. I can't really come up with a good explanation for it, but there > > even without that there is an elephant in the room: as part of the > > scsi-mq series I moved the bqt field used for this into a union with the > > new blk_mq_tag_set. Below is a patch to get rid of that union, can you > > try if that fixes it? > > Unfortunately that does not fix it :| Alright, I guess we need the big bisect hammer unfortunately. We should be able to start with trying the first and last commit of the big SCSI merge: start: fcc95a763444017288b318d48367098850c23c0d end: c21a2c1a4973c8dde32557970fdb44eaa9489aeb