diff options
| author |   Grygorii Strashko <grygorii.strashko@ti.com> | 2015-06-25 18:18:11 +0300 |
|---|---|---|
| committer |   Linus Walleij <linus.walleij@linaro.org> | 2015-07-16 10:44:57 +0200 |
| commit | 049aaf9f7e30731ce030eef3e4fd255cf8b1ae02 (patch) | |
| tree | f5c7eac9b67300da06f2ce7459e497611864687c /drivers/gpio/gpio-pcf857x.c | |
| parent | gpio: rcar: Fine-grained Runtime PM support (diff) | |
| download | linux-dev-049aaf9f7e30731ce030eef3e4fd255cf8b1ae02.tar.xz linux-dev-049aaf9f7e30731ce030eef3e4fd255cf8b1ae02.zip | |
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>
Diffstat (limited to 'drivers/gpio/gpio-pcf857x.c')
| -rw-r--r-- | drivers/gpio/gpio-pcf857x.c | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/drivers/gpio/gpio-pcf857x.c b/drivers/gpio/gpio-pcf857x.c index 404f3c61ef9b..1d4d9bc8b69d 100644 --- a/drivers/gpio/gpio-pcf857x.c +++ b/drivers/gpio/gpio-pcf857x.c @@ -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; - for_each_set_bit(i, &change, gpio->chip.ngpio) - handle_nested_irq(irq_find_mapping(gpio->chip.irqdomain, i)); gpio->status = status; + mutex_unlock(&gpio->lock); - spin_unlock_irqrestore(&gpio->slock, flags); + for_each_set_bit(i, &change, gpio->chip.ngpio) + handle_nested_irq(irq_find_mapping(gpio->chip.irqdomain, i)); 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; |