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

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>
This commit is contained in:
SeongJae Park 2020-12-14 10:04:18 +01:00 committed by Juergen Gross
parent fed1755b11
commit 2e85d32b1c
6 changed files with 17 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/block/xen-blkback/xenbus.c
View File

@ -675,7 +675,8 @@ 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;

2
drivers/net/xen-netback/xenbus.c
View File

@ -824,7 +824,7 @@ static void connect(struct backend_info *be)
xenvif_carrier_on(be->vif);
unregister_hotplug_status_watch(be);
err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch,
err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch, NULL,
hotplug_status_changed,
"%s/%s", dev->nodename, "hotplug-status");
if (!err)

2
drivers/xen/xen-pciback/xenbus.c
View File

@ -689,7 +689,7 @@ static int xen_pcibk_xenbus_probe(struct xenbus_device *dev,
/* watch the backend node for backend configuration information */
err = xenbus_watch_path(dev, dev->nodename, &pdev->be_watch,
xen_pcibk_be_watch);
NULL, xen_pcibk_be_watch);
if (err)
goto out;

9
drivers/xen/xenbus/xenbus_client.c
View File

@ -127,19 +127,22 @@ EXPORT_SYMBOL_GPL(xenbus_strstate);
*/
int xenbus_watch_path(struct xenbus_device *dev, const char *path,
struct xenbus_watch *watch,
bool (*will_handle)(struct xenbus_watch *,
const char *, const char *),
void (*callback)(struct xenbus_watch *,
const char *, const char *))
{
int err;
watch->node = path;
watch->will_handle = NULL;
watch->will_handle = will_handle;
watch->callback = callback;
err = register_xenbus_watch(watch);
if (err) {
watch->node = NULL;
watch->will_handle = NULL;
watch->callback = NULL;
xenbus_dev_fatal(dev, err, "adding watch on %s", path);
}
@ -166,6 +169,8 @@ EXPORT_SYMBOL_GPL(xenbus_watch_path);
*/
int xenbus_watch_pathfmt(struct xenbus_device *dev,
struct xenbus_watch *watch,
bool (*will_handle)(struct xenbus_watch *,
const char *, const char *),
void (*callback)(struct xenbus_watch *,
const char *, const char *),
const char *pathfmt, ...)
@ -182,7 +187,7 @@ int xenbus_watch_pathfmt(struct xenbus_device *dev,
xenbus_dev_fatal(dev, -ENOMEM, "allocating path for watch");
return -ENOMEM;
}
err = xenbus_watch_path(dev, path, watch, callback);
err = xenbus_watch_path(dev, path, watch, will_handle, callback);
if (err)
kfree(path);

2
drivers/xen/xenbus/xenbus_probe.c
View File

@ -136,7 +136,7 @@ static int watch_otherend(struct xenbus_device *dev)
container_of(dev->dev.bus, struct xen_bus_type, bus);
return xenbus_watch_pathfmt(dev, &dev->otherend_watch,
bus->otherend_changed,
NULL, bus->otherend_changed,
"%s/%s", dev->otherend, "state");
}

6
include/xen/xenbus.h
View File

@ -204,10 +204,14 @@ void xenbus_probe(struct work_struct *);
int xenbus_watch_path(struct xenbus_device *dev, const char *path,
struct xenbus_watch *watch,
bool (*will_handle)(struct xenbus_watch *,
const char *, const char *),
void (*callback)(struct xenbus_watch *,
const char *, const char *));
__printf(4, 5)
__printf(5, 6)
int xenbus_watch_pathfmt(struct xenbus_device *dev, struct xenbus_watch *watch,
bool (*will_handle)(struct xenbus_watch *,
const char *, const char *),
void (*callback)(struct xenbus_watch *,
const char *, const char *),
const char *pathfmt, ...);