[media] cobalt: use pci_irq_allocate_vectors()

Simplify the interrupt setup by using the new PCI layer helpers.

Despite using pci_enable_msi_range(), this driver was only requesting a
single MSI vector anyway.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/media/pci/cobalt/cobalt-driver.c

@@ -308,9 +308,7 @@ static void cobalt_pci_iounmap(struct cobalt *cobalt, struct pci_dev *pci_dev)
 static void cobalt_free_msi(struct cobalt *cobalt, struct pci_dev *pci_dev)
 {
 	free_irq(pci_dev->irq, (void *)cobalt);
-
-	if (cobalt->msi_enabled)
-		pci_disable_msi(pci_dev);
+	pci_free_irq_vectors(pci_dev);
 }
 
 static int cobalt_setup_pci(struct cobalt *cobalt, struct pci_dev *pci_dev,
@@ -387,14 +385,12 @@ static int cobalt_setup_pci(struct cobalt *cobalt, struct pci_dev *pci_dev,
 	   from being generated. */
 	cobalt_set_interrupt(cobalt, false);
 
-	if (pci_enable_msi_range(pci_dev, 1, 1) < 1) {
+	if (pci_alloc_irq_vectors(pci_dev, 1, 1, PCI_IRQ_MSI) < 1) {
 		cobalt_err("Could not enable MSI\n");
-		cobalt->msi_enabled = false;
 		ret = -EIO;
 		goto err_release;
 	}
 	msi_config_show(cobalt, pci_dev);
-	cobalt->msi_enabled = true;
 
 	/* Register IRQ */
 	if (request_irq(pci_dev->irq, cobalt_irq_handler, IRQF_SHARED,

drivers/media/pci/cobalt/cobalt-driver.h

@@ -287,8 +287,6 @@ struct cobalt {
 	u32 irq_none;
 	u32 irq_full_fifo;
 
-	bool msi_enabled;
-
 	/* omnitek dma */
 	int dma_channels;
 	int first_fifo_channel;