From 85597c4369c9941dd38e47176ff8b540b2b583a3 Mon Sep 17 00:00:00 2001 From: SeongJae Park Date: Mon, 14 Dec 2020 10:07:13 +0100 Subject: xen/xenbus: Count pending messages for each watch commit 3dc86ca6b4c8cfcba9da7996189d1b5a358a94fc upstream. This commit adds a counter of pending messages for each watch in the struct. It is used to skip unnecessary pending messages lookup in 'unregister_xenbus_watch()'. It could also be used in 'will_handle' callback. This is part of XSA-349 Cc: stable@vger.kernel.org Signed-off-by: SeongJae Park Reported-by: Michael Kurth Reported-by: Pawel Wieczorkiewicz Reviewed-by: Juergen Gross Signed-off-by: Juergen Gross Signed-off-by: Greg Kroah-Hartman --- include/xen/xenbus.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/xen') diff --git a/include/xen/xenbus.h b/include/xen/xenbus.h index de5ae6c6fa0f..eba01ab5a55e 100644 --- a/include/xen/xenbus.h +++ b/include/xen/xenbus.h @@ -59,6 +59,8 @@ struct xenbus_watch /* Path being watched. */ const char *node; + unsigned int nr_pending; + /* * Called just before enqueing new event while a spinlock is held. * The event will be discarded if this callback returns false. -- cgit v1.2.3