[Xen-devel] [PATCH 07 of 10] blkfront: Fix blkfront backend switch race (bdev release)

[Daniel Stodden <daniel.stodden@xxxxxxxxxx>]

We cannot read backend state within bdev operations, because it risks
grabbing the state change before xenbus gets to do it.

Fixed by tracking deferral with a frontend switch to Closing. State
exposure isn't strictly necessary, but the backends won't mind.

For a 'clean' deferral this seems actually a more decent protocol than
raising errors.

Signed-off-by: Daniel Stodden <daniel.stodden@xxxxxxxxxx>

Attachment: blkfront-bdev-release.diff
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