[PATCH v2 1/3] serial: 8250_pci: Refactor the loop in pci_ite887x_init()

Andy Shevchenko
2021-10-22T13:51:57Z

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>
---
v2: fixed OOB access (Jiri, Dan), dropped irrelevant changes (Jiri, Joe)
drivers/tty/serial/8250/8250_pci.c | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index 93159557a2fb..8a2f42507c18 100644
--- 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;
}
--
2.33.0