From: Parav Pandit parav@mellanox.com
[ Upstream commit 6093e348a5e2475c5bb2e571346460f939998670 ]
device_for_each_child() stops executing callback function for remaining child devices, if callback hits an error. Each child mdev device is independent of each other. While unregistering parent device, mdev core must remove all child mdev devices. Therefore, mdev_device_remove_cb() always returns success so that device_for_each_child doesn't abort if one child removal hits error.
While at it, improve remove and unregister functions for below simplicity.
There isn't need to pass forced flag pointer during mdev parent removal which invokes mdev_device_remove(). So simplify the flow.
mdev_device_remove() is called from two paths. 1. mdev_unregister_driver() mdev_device_remove_cb() mdev_device_remove() 2. remove_store() mdev_device_remove()
Fixes: 7b96953bc640 ("vfio: Mediated device Core driver") Reviewed-by: Maxim Levitsky mlevitsk@redhat.com Signed-off-by: Parav Pandit parav@mellanox.com Signed-off-by: Alex Williamson alex.williamson@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/vfio/mdev/mdev_core.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c index 8cfa71230877..e052f62fdea7 100644 --- a/drivers/vfio/mdev/mdev_core.c +++ b/drivers/vfio/mdev/mdev_core.c @@ -150,10 +150,10 @@ static int mdev_device_remove_ops(struct mdev_device *mdev, bool force_remove)
static int mdev_device_remove_cb(struct device *dev, void *data) { - if (!dev_is_mdev(dev)) - return 0; + if (dev_is_mdev(dev)) + mdev_device_remove(dev, true);
- return mdev_device_remove(dev, data ? *(bool *)data : true); + return 0; }
/* @@ -241,7 +241,6 @@ EXPORT_SYMBOL(mdev_register_device); void mdev_unregister_device(struct device *dev) { struct mdev_parent *parent; - bool force_remove = true;
mutex_lock(&parent_list_lock); parent = __find_parent_device(dev); @@ -255,8 +254,7 @@ void mdev_unregister_device(struct device *dev) list_del(&parent->next); class_compat_remove_link(mdev_bus_compat_class, dev, NULL);
- device_for_each_child(dev, (void *)&force_remove, - mdev_device_remove_cb); + device_for_each_child(dev, NULL, mdev_device_remove_cb);
parent_remove_sysfs_files(parent);