Re: [PATCH] scsi: Add QEMU CD-ROM to VPD Inquiry Blacklist

["Ewan D. Milne" <emilne@redhat.com>]

This is an existing configuration that broke with the VPD rescan
changes.  The problem is that the error causes a rescan to be
initiated, which results in endless error messages.

On Fri, 2016-06-03 at 03:15 +0000, Tom Yan wrote:
> Why not get qemu have it fixed instead?
> 
> On Tuesday, 31 May 2016, Johannes Thumshirn <jthumshirn@suse.de>
> wrote:
>         On Tue, May 31, 2016 at 09:42:29AM -0400, Ewan D. Milne wrote:
>         > Linux fails to boot as a guest with a QEMU CD-ROM:
>         >
>         > [    4.439488] ata2.00: ATAPI: QEMU CD-ROM, 0.8.2, max
>         UDMA/100
>         > [    4.443649] ata2.00: configured for MWDMA2
>         > [    4.450267] scsi 1:0:0:0: CD-ROM            QEMU     QEMU
>         CD-ROM      0.8. PQ: 0 ANSI: 5
>         > [    4.464317] ata2.00: exception Emask 0x0 SAct 0x0 SErr
>         0x0 action 0x6 frozen
>         > [    4.464319] ata2.00: BMDMA stat 0x5
>         > [    4.464339] ata2.00: cmd
>         a0/01:00:00:00:01/00:00:00:00:00/a0 tag 0 dma 16640 in
>         > [    4.464339]          Inquiry 12 01 00 00 ff 00res
>         48/20:02:00:24:00/00:00:00:00:00/a0 Emask 0x2 (HSM violation)
>         > [    4.464341] ata2.00: status: { DRDY DRQ }
>         > [    4.465864] ata2: soft resetting link
>         > [    4.625971] ata2.00: configured for MWDMA2
>         > [    4.628290] ata2: EH complete
>         > [    4.646670] ata2.00: exception Emask 0x0 SAct 0x0 SErr
>         0x0 action 0x6 frozen
>         > [    4.646671] ata2.00: BMDMA stat 0x5
>         > [    4.646683] ata2.00: cmd
>         a0/01:00:00:00:01/00:00:00:00:00/a0 tag 0 dma 16640 in
>         > [    4.646683]          Inquiry 12 01 00 00 ff 00res
>         48/20:02:00:24:00/00:00:00:00:00/a0 Emask 0x2 (HSM violation)
>         > [    4.646685] ata2.00: status: { DRDY DRQ }
>         > [    4.648193] ata2: soft resetting link
>         >
>         > ...
>         >
>         > Fix this by suppressing VPD inquiry for this device.
>         >
>         > Reported-by: Jan Stancek <jstancek@redhat.com>
>         > Tested-by: Jan Stancek <jstancek@redhat.com>
>         > Cc: <stable@vger.kernel.org>
>         > Signed-off-by: Ewan D. Milne <emilne@redhat.com>
>         
>         Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
>         
>         --
>         Johannes Thumshirn
>         Storage
>         jthumshirn@suse.de                                +49 911
>         74053 689
>         SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
>         GF: Felix Imendörffer, Jane Smithard, Graham Norton
>         HRB 21284 (AG Nürnberg)
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>         0850
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