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| author | SeongJae Park <sjpark@amazon.de> | 2020-12-14 10:07:13 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-29 13:42:45 +0100 |
| commit | df3367c1cb5e1a6d8a527d651f2163756c81c116 (patch) | |
| tree | 78962c011223e18422e57ad6929502a47cfe01b3 /include | |
| parent | 19cfeffce8ce9c6d04c9a5878e1603b7d5b2f6f8 (diff) | |
| download | linux-df3367c1cb5e1a6d8a527d651f2163756c81c116.tar.gz linux-df3367c1cb5e1a6d8a527d651f2163756c81c116.tar.bz2 linux-df3367c1cb5e1a6d8a527d651f2163756c81c116.zip | |
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 <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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -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 1772507dc2c9..ed9e7e3307b7 100644 --- a/include/xen/xenbus.h +++ b/include/xen/xenbus.h @@ -58,6 +58,8 @@ 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. |