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由 Konrad Rzeszutek Wilk 提交于
After the commit 0faa8cca (" xen/blkback: remove per-queue plugging") we forgot to retrieve the 'struct request_queue' from the block device. This puts the functionality back in and fixes a NULL pointer bug. Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
6fd17b56