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xen/blkback: fix xenbus_transaction_start() hang caused by double xenbus_transaction_end()

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vbd_resize() up_read()'s xs_state.suspend_mutex twice in a row via double
xenbus_transaction_end() calls. The next down_read() in
xenbus_transaction_start() (at eg. the next resize attempt) hangs.

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=618317

Acked-by: Jan Beulich <[email protected]>
Acked-by: Ian Campbell <[email protected]>
Signed-off-by: Laszlo Ersek <[email protected]>
Signed-off-by: Konrad Rzeszutek Wilk <[email protected]>
This commit is contained in:
Laszlo Ersek 2011-05-13 09:45:40 -04:00 • committed by Konrad Rzeszutek Wilk
commit 496b318eb6
1 changed files with 1 additions and 0 deletions
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1
drivers/block/xen-blkback/blkback.c
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@ -226,6 +226,7 @@ again:
goto again;
if (err)
pr_warn(DRV_PFX "Error ending transaction");
return;
abort:
xenbus_transaction_end(xbt, 1);
}