diff options
| author | SeongJae Park <sjpark@amazon.de> | 2020-12-14 10:07:13 +0100 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2020-12-14 10:07:13 +0100 |
| commit | 3dc86ca6b4c8cfcba9da7996189d1b5a358a94fc (patch) | |
| tree | f862850ffd2c042167390114c8b8e6354febce04 /include/xen | |
| parent | xen/xenbus/xen_bus_type: Support will_handle watch callback (diff) | |
| download | linux-3dc86ca6b4c8cfcba9da7996189d1b5a358a94fc.tar.xz linux-3dc86ca6b4c8cfcba9da7996189d1b5a358a94fc.zip | |
xen/xenbus: Count pending messages for each watch
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>
Diffstat (limited to 'include/xen')
| -rw-r--r-- | include/xen/xenbus.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/xen/xenbus.h b/include/xen/xenbus.h index c8574d1b814c..00c7235ae93e 100644 --- a/include/xen/xenbus.h +++ b/include/xen/xenbus.h @@ -61,6 +61,8 @@ 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. |