diff options
| author |   Juergen Gross <jgross@suse.com> | 2020-03-05 11:03:23 +0100 |
|---|---|---|
| committer |   Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2020-03-05 09:42:23 -0600 |
| commit | 2f69a110e7bba3ec6bc089a2f736ca0941d887ed (patch) | |
| tree | 57ffc62e0497d2f1be6ad89f9abd7c8adbdde722 /drivers/xen/xenbus/xenbus_probe.c | |
| parent | xenbus: req->err should be updated before req->state (diff) | |
| download | linux-dev-2f69a110e7bba3ec6bc089a2f736ca0941d887ed.tar.xz linux-dev-2f69a110e7bba3ec6bc089a2f736ca0941d887ed.zip | |
xen/xenbus: fix locking
Commit 060eabe8fbe726 ("xenbus/backend: Protect xenbus callback with
lock") introduced a bug by holding a lock while calling a function
which might schedule.
Fix that by using a semaphore instead.
Fixes: 060eabe8fbe726 ("xenbus/backend: Protect xenbus callback with lock")
Signed-off-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20200305100323.16736-1-jgross@suse.com
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'drivers/xen/xenbus/xenbus_probe.c')
| -rw-r--r-- | drivers/xen/xenbus/xenbus_probe.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c index 66975da4f3b6..8c4d05b687b7 100644 --- a/drivers/xen/xenbus/xenbus_probe.c +++ b/drivers/xen/xenbus/xenbus_probe.c @@ -239,9 +239,9 @@ int xenbus_dev_probe(struct device *_dev) goto fail; } - spin_lock(&dev->reclaim_lock); + down(&dev->reclaim_sem); err = drv->probe(dev, id); - spin_unlock(&dev->reclaim_lock); + up(&dev->reclaim_sem); if (err) goto fail_put; @@ -271,9 +271,9 @@ int xenbus_dev_remove(struct device *_dev) free_otherend_watch(dev); if (drv->remove) { - spin_lock(&dev->reclaim_lock); + down(&dev->reclaim_sem); drv->remove(dev); - spin_unlock(&dev->reclaim_lock); + up(&dev->reclaim_sem); } module_put(drv->driver.owner); @@ -473,7 +473,7 @@ int xenbus_probe_node(struct xen_bus_type *bus, goto fail; dev_set_name(&xendev->dev, "%s", devname); - spin_lock_init(&xendev->reclaim_lock); + sema_init(&xendev->reclaim_sem, 1); /* Register with generic device framework. */ err = device_register(&xendev->dev); |