[SCSI] ipr: Add support for MSI-X and distributed completion
The new generation IBM SAS Controllers will support MSI-X interrupts and Distributed Completion Processing features. This patch add these support in ipr device driver. Signed-off-by: NWen Xiong <wenxiong@linux.vnet.ibm.com> Acked-by: NBrian King <brking@linux.vnet.ibm.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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