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Subject: Re: [PATCH v2 7/8] scsi: sr: workaround VMware ESXi cdrom emulation
 bug
To:     =?UTF-8?Q?Michal_Such=c3=a1nek?= <msuchanek@suse.de>
Cc:     linux-scsi@vger.kernel.org, Jonathan Corbet <corbet@lwn.net>,
        Jens Axboe <axboe@kernel.dk>,
        "James E.J. Bottomley" <jejb@linux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
        Eric Biggers <ebiggers@google.com>,
        "J. Bruce Fields" <bfields@redhat.com>,
        Benjamin Coddington <bcodding@redhat.com>,
        Hannes Reinecke <hare@suse.com>,
        Omar Sandoval <osandov@fb.com>, Ming Lei <ming.lei@redhat.com>,
        Damien Le Moal <damien.lemoal@wdc.com>,
        Bart Van Assche <bvanassche@acm.org>,
        Tejun Heo <tj@kernel.org>, linux-doc@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
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From:   Hannes Reinecke <hare@suse.de>
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Message-ID: <15c972ea-5b3a-487f-7be5-a62d780896da@suse.de>
Date:   Thu, 24 Oct 2019 11:41:38 +0200
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On 10/24/19 10:56 AM, Michal Suchánek wrote:
> On Thu, Oct 24, 2019 at 07:46:57AM +0200, Hannes Reinecke wrote:
>> On 10/23/19 6:23 PM, Michal Suchánek wrote:
>>> On Wed, Oct 23, 2019 at 04:13:15PM +0200, Hannes Reinecke wrote:
[ .. ]>>>> This looks something which should be handled via a blacklist
flag, not
>>>> some inline hack which everyone forgets about it...
>>>
>>> AFAIK we used to have a blacklist but don't have anymore. So either it
>>> has to be resurrected for this one flag or an inline hack should be good
>>> enough.
>>>
>> But we do have one for generic scsi; cf drivers/scsi/scsi_devinfo.c.
>> And this pretty much falls into the category of SCSI quirks, so I'd
>> prefer have it hooked into that.
> 
> But generic scsi does not know about cdrom trays, does it?
> 
No, just about 'flags'. What you _do_ with those flags is up to you.
Or, rather, the driver.
Just define a 'tray detection broken' flag, and evaluate it in sr.c.

Where is the problem with that?

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      Teamlead Storage & Networking
hare@suse.de			                  +49 911 74053 688
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