bfa: Do not call pci_enable_msix() after it failed once

Function pci_enable_msix() should not be called in case
it threw a negative errno from a previous call.
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

@@ -1235,33 +1235,31 @@ bfad_setup_intr(struct bfad_s *bfad)
 	   (bfa_asic_id_cb(pdev->device) && !msix_disable_cb)) {
 
 		error = pci_enable_msix(bfad->pcidev, msix_entries, bfad->nvec);
-		if (error) {
-			/* In CT1 & CT2, try to allocate just one vector */
-			if (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,
+		/* In CT1 & CT2, try to allocate just one vector */
+		if (error > 0 && 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);
-			}
+		}
 
-			/*
-			 * 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), "
-				       "use line based.\n",
-					bfad->inst_no, error);
-				goto line_based;
-			}
+		/*
+		 * 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), "
+			       "use line based.\n",
+				bfad->inst_no, error);
+			goto line_based;
 		}
 
 		/* Disable INTX in MSI-X mode */