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iio: trigger: Print an error if there is no available irq

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If there are more trigger consumers than
CONFIG_IIO_CONSUMERS_PER_TRIGGER, iio_trigger_attach_poll_func will
silently fail. Add an error message to inform the user that
CONFIG_IIO_CONSUMERS_PER_TRIGGER limit might be exceeded.

Signed-off-by: Mathieu Othacehe <m.othacehe@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Mathieu Othacehe 2019-02-20 17:49:10 +01:00 committed by Jonathan Cameron
parent cb57f2eb01
commit be35d281da
1 changed files with 4 additions and 1 deletions
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5
drivers/iio/industrialio-trigger.c
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@ -254,8 +254,11 @@ static int iio_trigger_attach_poll_func(struct iio_trigger *trig,
/* Get irq number */
pf->irq = iio_trigger_get_irq(trig);
if (pf->irq < 0)
if (pf->irq < 0) {
pr_err("Could not find an available irq for trigger %s, CONFIG_IIO_CONSUMERS_PER_TRIGGER=%d limit might be exceeded\n",
trig->name, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
goto out_put_module;
}
/* Request irq */
ret = request_threaded_irq(pf->irq, pf->h, pf->thread,