gpio: at91: add sanity check for the NULL pointer
We need check the NULL pointer as at91_pio_get_port() may return NULL.
Also print a error message when at91_pio_get_port() failed otherwise we
cannot notice the failure.
Signed-off-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/drivers/gpio/at91_gpio.c b/drivers/gpio/at91_gpio.c
index 0b70071..6517af1 100644
--- a/drivers/gpio/at91_gpio.c
+++ b/drivers/gpio/at91_gpio.c
@@ -34,6 +34,7 @@
#endif
#endif
default:
+ printf("Error: at91_gpio: Fail to get PIO base!\n");
return NULL;
}
}
@@ -200,7 +201,7 @@
struct at91_port *at91_port = at91_pio_get_port(port);
u32 mask;
- if ((port < ATMEL_PIO_PORTS) && (pin < 32)) {
+ if (at91_port && (port < ATMEL_PIO_PORTS) && (pin < 32)) {
mask = 1 << pin;
writel(mask, &at91_port->idr);
writel(mask, &at91_port->pudr);