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xen/xenbus: Add 'will_handle' callback support in xenbus_watch_path()

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commit 2e85d32b1c upstream.

Some code does not directly make 'xenbus_watch' object and call
'register_xenbus_watch()' but use 'xenbus_watch_path()' instead.  This
commit adds support of 'will_handle' callback in the
'xenbus_watch_path()' and it's wrapper, 'xenbus_watch_pathfmt()'.

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>
This commit is contained in:
SeongJae Park
2020-12-14 10:04:18 +01:00
committed by Greg Kroah-Hartman
parent b4898bdd20
commit 9ae6d2f4ca
6 changed files with 17 additions and 7 deletions
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3
drivers/block/xen-blkback/xenbus.c
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@@ -676,7 +676,8 @@ static int xen_blkbk_probe(struct xenbus_device *dev,
/* setup back pointer */
be->blkif->be = be;
err = xenbus_watch_pathfmt(dev, &be->backend_watch, backend_changed,
err = xenbus_watch_pathfmt(dev, &be->backend_watch, NULL,
backend_changed,
"%s/%s", dev->nodename, "physical-device");
if (err)
goto fail;