Re: [PATCH v4 5/8] mtd: ubi: attach MTD partition from device-tree

[Richard Weinberger]

----- Ursprüngliche Mail -----
> diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
> index e0618bbde3613..99b5f502c9dbc 100644
> --- a/drivers/mtd/ubi/block.c
> +++ b/drivers/mtd/ubi/block.c
> @@ -470,7 +470,7 @@ int ubiblock_remove(struct ubi_volume_info *vi, bool force)
> 	}
> 
> 	/* Found a device, let's lock it so we can check if it's busy */
> -	mutex_lock(&dev->dev_mutex);
> +	mutex_lock_nested(&dev->dev_mutex, SINGLE_DEPTH_NESTING);

The usage of mutex_lock_nested() in this patch looks fishy.
Can you please elaborate a bit more why all these mutexes can be taken twice?
(Any why not more often).

Thanks,
//richard