xen/xenbus: Count pending messages for each watch

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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 <sjpark@amazon.de>
Reported-by: Michael Kurth <mku@amazon.de>
Reported-by: Pawel Wieczorkiewicz <wipawel@amazon.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

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This commit is contained in:

SeongJae Park 2020-12-14 10:07:13 +01:00 • committed by Juergen Gross

parent be987200fb

commit 3dc86ca6b4

2 changed files with 20 additions and 11 deletions

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include/xen/xenbus.h

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