serial: 8250_pci: Refactor the loop in pci_ite887x_init()

The loop can be refactored by using ARRAY_SIZE() instead of NULL terminator.
This reduces code base and makes it easier to read and understand.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Jiri Slaby <jslaby@kernel.org>
Link: https://lore.kernel.org/r/20211022135147.70965-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index 93159557a2fb12e799eda5036f3723b1e95f2fb3..8a2f42507c18c6caaa438bc08b02bc39287afb0a 100644 (file)
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -897,18 +897,16 @@ static int pci_netmos_init(struct pci_dev *dev)
 /* enable IO_Space bit */
 #define ITE_887x_POSIO_ENABLE          (1 << 31)
 
+/* inta_addr are the configuration addresses of the ITE */
+static const short inta_addr[] = { 0x2a0, 0x2c0, 0x220, 0x240, 0x1e0, 0x200, 0x280 };
 static int pci_ite887x_init(struct pci_dev *dev)
 {
-       /* inta_addr are the configuration addresses of the ITE */
-       static const short inta_addr[] = { 0x2a0, 0x2c0, 0x220, 0x240, 0x1e0,
-                                                       0x200, 0x280, 0 };
        int ret, i, type;
        struct resource *iobase = NULL;
        u32 miscr, uartbar, ioport;
 
        /* search for the base-ioport */
-       i = 0;
-       while (inta_addr[i] && iobase == NULL) {
+       for (i = 0; i < ARRAY_SIZE(inta_addr); i++) {
                iobase = request_region(inta_addr[i], ITE_887x_IOSIZE,
                                                                "ite887x");
                if (iobase != NULL) {
@@ -925,12 +923,10 @@ static int pci_ite887x_init(struct pci_dev *dev)
                                break;
                        }
                        release_region(iobase->start, ITE_887x_IOSIZE);
-                       iobase = NULL;
                }
-               i++;
        }
 
-       if (!inta_addr[i]) {
+       if (i == ARRAY_SIZE(inta_addr)) {
                dev_err(&dev->dev, "ite887x: could not find iobase\n");
                return -ENODEV;
        }