A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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gpiolib: fix off by one errors

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The last gpio belonging to a chip is chip->base + chip->ngpios - 1.  Some
places in the code, but not all, forgot the critical minus one.

Signed-off-by: Trent Piepho <[email protected]>
Acked-by: David Brownell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Trent Piepho 2008-05-23 13:04:44 -07:00 • committed by Linus Torvalds
commit bff5fda972
1 changed files with 3 additions and 3 deletions
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6
drivers/gpio/gpiolib.c
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@ -127,7 +127,7 @@ int __init gpiochip_reserve(int start, int ngpio)
unsigned long flags;
int i;
if (!gpio_is_valid(start) || !gpio_is_valid(start + ngpio))
if (!gpio_is_valid(start) || !gpio_is_valid(start + ngpio - 1))
return -EINVAL;
spin_lock_irqsave(&gpio_lock, flags);
@ -170,7 +170,7 @@ int gpiochip_add(struct gpio_chip *chip)
unsigned id;
int base = chip->base;
if ((!gpio_is_valid(base) || !gpio_is_valid(base + chip->ngpio))
if ((!gpio_is_valid(base) || !gpio_is_valid(base + chip->ngpio - 1))
&& base >= 0) {
status = -EINVAL;
goto fail;
@ -207,7 +207,7 @@ fail:
/* failures here can mean systems won't boot... */
if (status)
pr_err("gpiochip_add: gpios %d..%d (%s) not registered\n",
chip->base, chip->base + chip->ngpio,
chip->base, chip->base + chip->ngpio - 1,
chip->label ? : "generic");
return status;
}