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gpiolib: Optimize gpiochip_remove() when check for requested line 

Here are the following optimizations have been done:
 - break the loop after first found requested line
  - due to above, drop redundant boolean variable
 - replace open coded variant of gpiochip_is_requested()
  - due to above, drop redundant pointer to struct gpio_desc
 - use 'unsigned int' instead of 'unsigned' for loop counter

Note, pointer to struct gpio_chip followed by pointer to struct gpio_device
is still valid, back link is not.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200225114725.839-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Andy Shevchenko 2020-02-25 13:47:25 +02:00 committed by Linus Walleij
parent 63636d956c
commit 869233f813
1 changed files with 4 additions and 7 deletions
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11
drivers/gpio/gpiolib.c
View File

@ -1797,10 +1797,8 @@ EXPORT_SYMBOL_GPL(gpiochip_get_data);
void gpiochip_remove(struct gpio_chip *chip)
{
struct gpio_device *gdev = chip->gpiodev;
struct gpio_desc *desc;
unsigned long flags;
unsigned i;
bool requested = false;
unsigned int i;
/* FIXME: should the legacy sysfs handling be moved to gpio_device? */
gpiochip_sysfs_unregister(gdev);
@ -1820,13 +1818,12 @@ void gpiochip_remove(struct gpio_chip *chip)
spin_lock_irqsave(&gpio_lock, flags);
for (i = 0; i < gdev->ngpio; i++) {
desc = &gdev->descs[i];
if (test_bit(FLAG_REQUESTED, &desc->flags))
requested = true;
if (gpiochip_is_requested(chip, i))
break;
}
spin_unlock_irqrestore(&gpio_lock, flags);
if (requested)
if (i == gdev->ngpio)
dev_crit(&gdev->dev,
"REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n");