scsi: ipr: Use pci_irq_allocate_vectors

Switch the ipr driver to use pci_alloc_irq_vectors.  We need to two
calls to pci_alloc_irq_vectors as ipr only supports multiple MSI-X
vectors, but not multiple MSI vectors.

Otherwise this cleans up a lot of cruft and allows to use a common
request_irq loop for irq types, which happens to only iterate over a
single line in the non MSI-X case.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ipr.h

@@ -1413,10 +1413,7 @@ struct ipr_chip_cfg_t {
 struct ipr_chip_t {
 	u16 vendor;
 	u16 device;
-	u16 intr_type;
-#define IPR_USE_LSI			0x00
-#define IPR_USE_MSI			0x01
-#define IPR_USE_MSIX			0x02
+	bool has_msi;
 	u16 sis_type;
 #define IPR_SIS32			0x00
 #define IPR_SIS64			0x01
@@ -1593,11 +1590,9 @@ struct ipr_ioa_cfg {
 	struct ipr_cmnd **ipr_cmnd_list;
 	dma_addr_t *ipr_cmnd_list_dma;
 
-	u16 intr_flag;
 	unsigned int nvectors;
 
 	struct {
-		unsigned short vec;
 		char desc[22];
 	} vectors_info[IPR_MAX_MSIX_VECTORS];