bfa: Use pci_enable_msix_exact() instead of pci_enable_msix()

As result of deprecation of MSI-X/MSI enablement functions
pci_enable_msix() and pci_enable_msi_block() all drivers
using these two interfaces need to be updated to use the
new pci_enable_msi_range()  or pci_enable_msi_exact()
and pci_enable_msix_range() or pci_enable_msix_exact()
interfaces.
Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Acked-by: Anil Gurumurthy <anil.gurumurthy@qlogic.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/scsi/bfa/bfad.c

@@ -1234,29 +1234,21 @@ bfad_setup_intr(struct bfad_s *bfad)
 	if ((bfa_asic_id_ctc(pdev->device) && !msix_disable_ct) ||
 	   (bfa_asic_id_cb(pdev->device) && !msix_disable_cb)) {
 
-		error = pci_enable_msix(bfad->pcidev, msix_entries, bfad->nvec);
+		error = pci_enable_msix_exact(bfad->pcidev,
+					      msix_entries, bfad->nvec);
 		/* In CT1 & CT2, try to allocate just one vector */
-		if (error > 0 && bfa_asic_id_ctc(pdev->device)) {
+		if (error == -ENOSPC && bfa_asic_id_ctc(pdev->device)) {
 			printk(KERN_WARNING "bfa %s: trying one msix "
 			       "vector failed to allocate %d[%d]\n",
 			       bfad->pci_name, bfad->nvec, error);
 			bfad->nvec = 1;
-			error = pci_enable_msix(bfad->pcidev,
-						msix_entries, bfad->nvec);
+			error = pci_enable_msix_exact(bfad->pcidev,
+						      msix_entries, 1);
 		}
 
-		/*
-		 * Only error number of vector is available.
-		 * We don't have a mechanism to map multiple
-		 * interrupts into one vector, so even if we
-		 * can try to request less vectors, we don't
-		 * know how to associate interrupt events to
-		 *  vectors. Linux doesn't duplicate vectors
-		 * in the MSIX table for this case.
-		 */
 		if (error) {
 			printk(KERN_WARNING "bfad%d: "
-			       "pci_enable_msix failed (%d), "
+			       "pci_enable_msix_exact failed (%d), "
 			       "use line based.\n",
 				bfad->inst_no, error);
 			goto line_based;