Re: [Xen-devel] [PATCH] xen-netfront: Fix hang on device removal
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Date: 2018-02-28 15:19:51
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On 02/28/2018 07:23 AM, Jason Andryuk wrote:
A toolstack may delete the vif frontend and backend xenstore entries
while xen-netfront is in the removal code path. In that case, the
checks for xenbus_read_driver_state would return XenbusStateUnknown, and
xennet_remove would hang indefinitely. This hang prevents system
shutdown.
xennet_remove must be able to handle XenbusStateUnknown, and
netback_changed must also wake up the wake_queue for that state as well.
Fixes: 5b5971df3bc2 ("xen-netfront: remove warning when unloading module")
Signed-off-by: Jason Andryuk <redacted>
Cc: Eduardo Otubo <redacted>Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>