md: get rdev->mddev with READ_ONCE()

Users may get rdev->mddev by sysfs while rdev is releasing.
So use both READ_ONCE() and WRITE_ONCE() to prevent load/store tearing
and to read/write mddev atomically.

Signed-off-by: Li Lingfeng <lilingfeng3@huawei.com>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20231229070500.3602712-1-lilingfeng@huaweicloud.com

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 0b132ee2672efd160a7774415c46ef86d17621d5..5eff8e84cddf215c17068527e2a75f8b0eb6fbf9 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2591,7 +2591,7 @@ static void md_kick_rdev_from_array(struct md_rdev *rdev)
        list_del_rcu(&rdev->same_set);
        pr_debug("md: unbind<%pg>\n", rdev->bdev);
        mddev_destroy_serial_pool(rdev->mddev, rdev);
-       rdev->mddev = NULL;
+       WRITE_ONCE(rdev->mddev, NULL);
        sysfs_remove_link(&rdev->kobj, "block");
        sysfs_put(rdev->sysfs_state);
        sysfs_put(rdev->sysfs_unack_badblocks);
@@ -3664,7 +3664,7 @@ rdev_attr_store(struct kobject *kobj, struct attribute *attr,
        struct kernfs_node *kn = NULL;
        bool suspend = false;
        ssize_t rv;
-       struct mddev *mddev = rdev->mddev;
+       struct mddev *mddev = READ_ONCE(rdev->mddev);
 
        if (!entry->store)
                return -EIO;