| Date | Tue, 7 Jun 2011 16:03:19 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH 07/15] writeback: split inode_wb_list_lock into bdi_writeback.list_lock |
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On Wed, 08 Jun 2011 05:32:43 +0800 Wu Fengguang <fengguang.wu@intel.com> 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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