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gpio: pcf857x: get rid of slock spinlock 

The spinlock 'slock' is used now to protect pcf857x_irq() from itself
which is unnecessary (especially after switching to use threaded
IRQs). Hence, remove it and use mutex to protect device data in IRQ
handler.

Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
hifive-unleashed-5.1
Grygorii Strashko 2015-06-25 18:18:11 +03:00 committed by Linus Walleij
parent 65194cb174
commit 049aaf9f7e
1 changed files with 5 additions and 9 deletions
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14
drivers/gpio/gpio-pcf857x.c
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@ -88,7 +88,6 @@ struct pcf857x {
struct gpio_chip chip;
struct i2c_client *client;
struct mutex lock; /* protect 'out' */
spinlock_t slock; /* protect irq demux */
unsigned out; /* software latch */
unsigned status; /* current status */
unsigned int irq_parent;
@ -185,23 +184,21 @@ static void pcf857x_set(struct gpio_chip *chip, unsigned offset, int value)
static irqreturn_t pcf857x_irq(int irq, void *data)
{
struct pcf857x *gpio = data;
unsigned long change, i, status, flags;
unsigned long change, i, status;
status = gpio->read(gpio->client);
spin_lock_irqsave(&gpio->slock, flags);
/*
* call the interrupt handler iff gpio is used as
* interrupt source, just to avoid bad irqs
*/
mutex_lock(&gpio->lock);
change = (gpio->status ^ status) & gpio->irq_enabled;
gpio->status = status;
mutex_unlock(&gpio->lock);
for_each_set_bit(i, &change, gpio->chip.ngpio)
handle_nested_irq(irq_find_mapping(gpio->chip.irqdomain, i));
gpio->status = status;
spin_unlock_irqrestore(&gpio->slock, flags);
return IRQ_HANDLED;
}
@ -293,7 +290,6 @@ static int pcf857x_probe(struct i2c_client *client,
return -ENOMEM;
mutex_init(&gpio->lock);
spin_lock_init(&gpio->slock);
gpio->chip.base = pdata ? pdata->gpio_base : -1;
gpio->chip.can_sleep = true;