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Subjectdrivers/misc/apds990x.c: might_sleep operation in interrupt handler
From
Interrupt handler apds990x_irq in APDS990x sensor driver
invokes mutex_lock that is might sleep operation.

Found by Linux Driver Verification project (linuxtesting.org)
within my participation in the GSoC 2012 program.


static irqreturn_t apds990x_irq(int irq, void *data)
{
struct apds990x_chip *chip = data;
u8 status;
apds990x_read_byte(chip, APDS990X_STATUS, &status);
apds990x_ack_int(chip, status);

mutex_lock(&chip->mutex);
...
}
static int __devinit apds990x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
...
err = request_threaded_irq(client->irq, NULL,
apds990x_irq,
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_LOW |
IRQF_ONESHOT,
"apds990x", chip);
...
}

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