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authorDavid Vrabel <david.vrabel@citrix.com>2014-02-04 18:53:56 +0000
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2014-02-07 13:35:20 -0500
commit3661371701e714f0cea4120f6a365340858fb4e4 (patch)
tree2deb8e53086519edbb39bc0525eaa286a83fbff1 /drivers/block
parent80bfa2f6e2e81049fc6cd3bfaeedcb64db3a9ba6 (diff)
downloadop-kernel-dev-3661371701e714f0cea4120f6a365340858fb4e4.zip
op-kernel-dev-3661371701e714f0cea4120f6a365340858fb4e4.tar.gz
xen-blkfront: handle backend CLOSED without CLOSING
Backend drivers shouldn't transistion to CLOSED unless the frontend is CLOSED. If a backend does transition to CLOSED too soon then the frontend may not see the CLOSING state and will not properly shutdown. So, treat an unexpected backend CLOSED state the same as CLOSING. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: stable@vger.kernel.org Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/xen-blkfront.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 7d09dfc..76e5c0b 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -1904,13 +1904,16 @@ static void blkback_changed(struct xenbus_device *dev,
case XenbusStateReconfiguring:
case XenbusStateReconfigured:
case XenbusStateUnknown:
- case XenbusStateClosed:
break;
case XenbusStateConnected:
blkfront_connect(info);
break;
+ case XenbusStateClosed:
+ if (dev->state == XenbusStateClosed)
+ break;
+ /* Missed the backend's Closing state -- fallthrough */
case XenbusStateClosing:
blkfront_closing(info);
break;
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