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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>
This commit is contained in:
Geert Uytterhoeven 2015-05-26 13:34:02 +02:00 committed by Linus Walleij
parent 08b085a07e
commit ffb8e44bd7
1 changed files with 14 additions and 2 deletions
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16
drivers/gpio/gpio-pcf857x.c
View File

@ -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;
irq_set_irq_wake(gpio->client->irq, on);
return 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;
}
}
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.