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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>
This commit is contained in:
parent
22ef37eed6
commit
28afea5b2f
1 changed files with 4 additions and 2 deletions
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@ -977,8 +977,10 @@ static void backend_changed(struct xenbus_device *dev,
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break;
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case XenbusStateClosing:
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if (info->gd == NULL)
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xenbus_dev_fatal(dev, -ENODEV, "gd is NULL");
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if (info->gd == NULL) {
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xenbus_frontend_closed(dev);
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break;
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}
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bd = bdget_disk(info->gd, 0);
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if (bd == NULL)
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xenbus_dev_fatal(dev, -ENODEV, "bdget failed");
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