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| author | Ian Campbell <ian.campbell@citrix.com> | 2009-05-19 08:25:48 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-05-19 08:25:48 +0200 |
| commit | 28afea5b2ffaa48f4f43d22ae8edcc384c05df80 (patch) | |
| tree | a14c5275a701b1453447f3e7fa3a529ce08de994 /drivers/block/xen-blkfront.c | |
| parent | 22ef37eed673587ac984965dc88ba94c68873291 (diff) | |
| download | blackbird-op-linux-28afea5b2ffaa48f4f43d22ae8edcc384c05df80.tar.gz blackbird-op-linux-28afea5b2ffaa48f4f43d22ae8edcc384c05df80.zip | |
xen/blkfront: allow xenbus state transition to Closing->Closed when not Connected
This situation can occur when attempting to attach a block device whose
backend is an empty physical CD-ROM driver. The backend in this case
will go directly from the Initialising state to Closing->Closed.
Previously this would result in a NULL pointer deref on info->gd
(xenbus_dev_fatal does not return as a1a15ac5 seems to expect)
Cc: stable@kernel.org
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/block/xen-blkfront.c')
| -rw-r--r-- | drivers/block/xen-blkfront.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 8f905089b72b..6971a12e8b9b 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -977,8 +977,10 @@ static void backend_changed(struct xenbus_device *dev, break; case XenbusStateClosing: - if (info->gd == NULL) - xenbus_dev_fatal(dev, -ENODEV, "gd is NULL"); + if (info->gd == NULL) { + xenbus_frontend_closed(dev); + break; + } bd = bdget_disk(info->gd, 0); if (bd == NULL) xenbus_dev_fatal(dev, -ENODEV, "bdget failed"); |
