regulator: gpio: properly check return value of of_get_named_gpio

The function of_get_named_gpio() could return -ENOENT, -EPROBE_DEFER
-EINVAL and so on. Currently, for the optional property "enable-gpio",
we only check -EPROBE_DEFER, this is not enough since there may be
misconfigured "enable-gpio" in the DTB, of_get_named_gpio() will return
-EINVAL in this case, we should return immediately here. And for the
optional property "gpios", we didn't check the return value, the driver
will continue to the point where gpio_request_array() is called, it
doesn't make sense to continue if we got -EPROBE_DEFER or -EINVAL here.

This patch tries to address these two issues by properly checking the
return value of of_get_named_gpio.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

path: root/sound/pci/ctxfi/cttimer.h

/*
 * Timer handling
 */

#ifndef __CTTIMER_H
#define __CTTIMER_H

#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/list.h>

struct snd_pcm_substream;
struct ct_atc;
struct ct_atc_pcm;

struct ct_timer;
struct ct_timer_instance;

struct ct_timer *ct_timer_new(struct ct_atc *atc);
void ct_timer_free(struct ct_timer *atimer);

struct ct_timer_instance *
ct_timer_instance_new(struct ct_timer *atimer, struct ct_atc_pcm *apcm);
void ct_timer_instance_free(struct ct_timer_instance *ti);
void ct_timer_start(struct ct_timer_instance *ti);
void ct_timer_stop(struct ct_timer_instance *ti);
void ct_timer_prepare(struct ct_timer_instance *ti);

#endif /* __CTTIMER_H */