diff options
| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2015-05-26 14:34:02 +0300 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2015-06-01 17:55:25 +0300 |
| commit | ffb8e44bd7617ede81d526d33d13d96a2c6a6e20 (patch) | |
| tree | 08dceb61e75f5e0b3715d8fa93de8583b268afcd /drivers/gpio | |
| parent | 08b085a07efe12568d86dff064e6f089e2971744 (diff) | |
| download | linux-ffb8e44bd7617ede81d526d33d13d96a2c6a6e20.tar.xz | |
gpio: pcf857x: Check for irq_set_irq_wake() failures
If an interrupt controller doesn't support wake-up configuration,
irq_set_irq_wake() returns an error code. Then any subsequent call
trying to deconfigure wake-up will cause an imbalance, and a warning
will be printed:
WARNING: CPU: 1 PID: 1341 at kernel/irq/manage.c:540 irq_set_irq_wake+0x
Unbalanced IRQ 26 wake disable
To fix this, refrain from any further parent interrupt controller
(de)configuration if irq_set_irq_wake() failed.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpio-pcf857x.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/gpio/gpio-pcf857x.c b/drivers/gpio/gpio-pcf857x.c index 945f0cda8529..83db0e19ec7e 100644 --- a/drivers/gpio/gpio-pcf857x.c +++ b/drivers/gpio/gpio-pcf857x.c @@ -91,6 +91,7 @@ struct pcf857x { spinlock_t slock; /* protect irq demux */ unsigned out; /* software latch */ unsigned status; /* current status */ + unsigned int irq_parent; int (*write)(struct i2c_client *client, unsigned data); int (*read)(struct i2c_client *client); @@ -217,9 +218,19 @@ static unsigned int noop_ret(struct irq_data *data) static int pcf857x_irq_set_wake(struct irq_data *data, unsigned int on) { struct pcf857x *gpio = irq_data_get_irq_chip_data(data); + int error = 0; + + if (gpio->irq_parent) { + error = irq_set_irq_wake(gpio->irq_parent, on); + if (error) { + dev_dbg(&gpio->client->dev, + "irq %u doesn't support irq_set_wake\n", + gpio->irq_parent); + gpio->irq_parent = 0; + } + } - irq_set_irq_wake(gpio->client->irq, on); - return 0; + return error; } static struct irq_chip pcf857x_irq_chip = { @@ -364,6 +375,7 @@ static int pcf857x_probe(struct i2c_client *client, gpiochip_set_chained_irqchip(&gpio->chip, &pcf857x_irq_chip, client->irq, NULL); + gpio->irq_parent = client->irq; } /* Let platform code set up the GPIOs and their users. |