Re: [PATCH 07/15] writeback: split inode_wb_list_lock intobdi_writeback.list_lock

[Andrew Morton]

On Wed, 08 Jun 2011 05:32:43 +0800
Wu Fengguang <fengguang.wu@xxxxxxxxx> wrote:

>  static void bdev_inode_switch_bdi(struct inode *inode,
>  			struct backing_dev_info *dst)
>  {
> -	spin_lock(&inode_wb_list_lock);
> +	struct backing_dev_info *old = inode->i_data.backing_dev_info;
> +
> +	if (unlikely(dst == old))		/* deadlock avoidance */
> +		return;

Why does this occur?
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