tree cbdd63728027fc17b86025cc6a11353c88ab7819
parent efd1535270c1deb0487527bf0c3c827301a69c93
author Bob Liu <bob.liu@oracle.com> 1464685157 +0800
committer Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 1465408486 -0400

xen-blkfront: fix resume issues after a migration

After a migrate to another host (which may not have multiqueue
support), the number of rings (block hardware queues)
may be changed and the ring info structure will also be reallocated.

This patch fixes two related bugs:
 * call blk_mq_update_nr_hw_queues() to make blk-core know the number
   of hardware queues have been changed.
 * Don't store rinfo pointer to hctx->driver_data, because rinfo may be
   reallocated so use hctx->queue_num to get the rinfo structure instead.

Signed-off-by: Bob Liu <bob.liu@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>