From: Anand Jain anand.jain@oracle.com
mainline inclusion from mainline-v5.16-rc1 commit cdccc03a8a369b59cff5e7ea3292511cfa551120 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA77UW CVE: CVE-2021-47599
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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There were few lockdep warnings because btrfs_show_devname() was using device_list_mutex as recorded in the commits:
0ccd05285e7f ("btrfs: fix a possible umount deadlock") 779bf3fefa83 ("btrfs: fix lock dep warning, move scratch dev out of device_list_mutex and uuid_mutex")
And finally, commit 88c14590cdd6 ("btrfs: use RCU in btrfs_show_devname for device list traversal") removed the device_list_mutex from btrfs_show_devname for performance reasons.
This patch removes a stale comment about the function btrfs_show_devname and device_list_mutex.
Signed-off-by: Anand Jain anand.jain@oracle.com Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Yifan Qiao qiaoyifan4@huawei.com --- fs/btrfs/volumes.c | 7 ------- 1 file changed, 7 deletions(-)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 2e7a8c1f6db4..20784a3ade38 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -2317,13 +2317,6 @@ void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev)
mutex_unlock(&fs_devices->device_list_mutex);
- /* - * The update_dev_time() with in btrfs_scratch_superblocks() - * may lead to a call to btrfs_show_devname() which will try - * to hold device_list_mutex. And here this device - * is already out of device list, so we don't have to hold - * the device_list_mutex lock. - */ btrfs_scratch_superblocks(tgtdev->fs_info, tgtdev->bdev, tgtdev->name->str);