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md: get rdev->mddev with READ_ONCE()

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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
This commit is contained in:
Li Lingfeng 2023-12-29 15:05:00 +08:00 committed by Song Liu
parent faeaf210a5
commit 9cfcf99e7e
1 changed files with 2 additions and 2 deletions
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4
drivers/md/md.c
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@ -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;