tty/nozomi: use pci_iomap instead of ioremap_nocache

Use pci_iomap instead of ioremap_nocache in nozomi_card_init(). This
is a cleaner way to do PCI MMIO (performs additional checks) and
allows to drop the manual call to pci_resource_start.

pci_iomap relies on ioremap for MMIO and thus has uncached behavior.

Signed-off-by: Hugo Lefeuvre <hle@owl.eu.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: hlef

drivers/tty/nozomi.c

@@ -1317,7 +1317,6 @@ static void remove_sysfs_files(struct nozomi *dc)
 static int nozomi_card_init(struct pci_dev *pdev,
 				      const struct pci_device_id *ent)
 {
-	resource_size_t start;
 	int ret;
 	struct nozomi *dc = NULL;
 	int ndev_idx;
@@ -1357,17 +1356,10 @@ static int nozomi_card_init(struct pci_dev *pdev,
 		goto err_disable_device;
 	}
 
-	start = pci_resource_start(dc->pdev, 0);
-	if (start == 0) {
-		dev_err(&pdev->dev, "No I/O address for card detected\n");
-		ret = -ENODEV;
-		goto err_rel_regs;
-	}
-
 	/* Find out what card type it is */
 	nozomi_get_card_type(dc);
 
-	dc->base_addr = ioremap_nocache(start, dc->card_type);
+	dc->base_addr = pci_iomap(dc->pdev, 0, dc->card_type);
 	if (!dc->base_addr) {
 		dev_err(&pdev->dev, "Unable to map card MMIO\n");
 		ret = -ENODEV;