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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