linux-kernel - Re: [PATCH v2] scsi: virtio_scsi: unplug LUNs when events missed

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Date:   Mon, 9 Sep 2019 18:55:48 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Stefan Hajnoczi <stefanha@...hat.com>,
        Matt Lupfer <mlupfer@....com>
Cc:     "mst@...hat.com" <mst@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] scsi: virtio_scsi: unplug LUNs when events missed

On 06/09/19 10:54, Stefan Hajnoczi wrote:
> On Thu, Sep 05, 2019 at 06:19:28PM +0000, Matt Lupfer wrote:
>> The event handler calls scsi_scan_host() when events are missed, which
>> will hotplug new LUNs.  However, this function won't remove any
>> unplugged LUNs.  The result is that hotunplug doesn't work properly when
>> the number of unplugged LUNs exceeds the event queue size (currently 8).
>>
>> Scan existing LUNs when events are missed to check if they are still
>> present.  If not, remove them.
>>
>> Signed-off-by: Matt Lupfer <mlupfer@....com>
>> ---
>>  drivers/scsi/virtio_scsi.c | 33 +++++++++++++++++++++++++++++++++
>>  1 file changed, 33 insertions(+)
> 
> Please include a changelog in future patch revisions.  For example:
> 
>   Signed-off-by: ...
>   ---
>   v2:
>     * Replaced magic constants with sd.h constants [Michael]
> 
> Just C and virtio code review, no SCSI specifics:
> 
> Reviewed-by: Stefan Hajnoczi <stefanha@...hat.com>
> 

Acked-by: Paolo Bonzini <pbonzini@...hat.com>



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