xen/events: avoid handling the same event on two cpus at the same time

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commit b6622798bc upstream.

When changing the cpu affinity of an event it can happen today that
(with some unlucky timing) the same event will be handled on the old
and the new cpu at the same time.

Avoid that by adding an "event active" flag to the per-event data and
call the handler only if this flag isn't set.

Cc: stable@vger.kernel.org
Reported-by: Julien Grall <julien@xen.org>
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Julien Grall <jgrall@amazon.com>
Link: https://lore.kernel.org/r/20210306161833.4552-4-jgross@suse.com
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Juergen Gross 2021-03-15 08:23:51 +01:00 • committed by Greg Kroah-Hartman

parent 30cdb862e8

commit f67e5243d0

1 changed files with 18 additions and 8 deletions

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drivers/xen/events/events_base.c

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