linux-kernel - [PATCH 0/1] virtio-scsi: fix missing unplug events when all LUNs are unplugged at the same time

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Message-Id: <20200729194806.4933-1-mlevitsk@redhat.com>
Date:   Wed, 29 Jul 2020 22:48:05 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        linux-scsi@...r.kernel.org (open list:SCSI SUBSYSTEM),
        virtualization@...ts.linux-foundation.org (open list:VIRTIO BLOCK AND
        SCSI DRIVERS), Stefan Hajnoczi <stefanha@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Jason Wang <jasowang@...hat.com>,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH 0/1] virtio-scsi: fix missing unplug events when all LUNs are
 unplugged at the same time

virtio-scsi currently has limit of 8 outstanding notifications so when more that
8 LUNs are unplugged, some are missed.

Commit 5ff843721467 ("scsi: virtio_scsi: unplug LUNs when events missed")
Fixed this by checking the 'event overflow' bit and manually scanned the bus
to see which LUNs are still there.

However there is a corner case when all LUNs are unplugged.
In this case (which is not fully scsi confirmant IMHO), all scsi
commands to such device respond with INVALID TARGET.

This patch proposes to detect this and remove the LUN in this case
as well.

Maxim Levitsky (1):
  scsi: virtio-scsi: handle correctly case when all LUNs were unplugged

 drivers/scsi/virtio_scsi.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

-- 
2.26.2