From f77ac91e8edade4755f732d52fa094dc3bfd8b8e Mon Sep 17 00:00:00 2001 From: Takashi Sakamoto Date: Tue, 22 Jul 2014 23:13:56 +0900 Subject: [PATCH] ALSA: bebob: Correction for return value of .put callback This commit is for correction of my misunderstanding about return value of .put callback in ALSA Control interface. According to 'Writing ALSA Driver' (*1), return value of the callback has three patterns; 1: changed, 0: not changed, an negative value: fatal error. But I misunderstood that it's boolean; zero or nonzero. *1: Writing an ALSA Driver (2005, Takashi Iwai) http://www.alsa-project.org/main/index.php/ALSA_Driver_Documentation Signed-off-by: Takashi Sakamoto Signed-off-by: Takashi Iwai --- sound/firewire/bebob/bebob_maudio.c | 26 +++++++++++++++++++------- 1 file changed, 19 insertions(+), 7 deletions(-) diff --git a/sound/firewire/bebob/bebob_maudio.c b/sound/firewire/bebob/bebob_maudio.c index 42e6f22156f0..d6d6ff8cb8dd 100644 --- a/sound/firewire/bebob/bebob_maudio.c +++ b/sound/firewire/bebob/bebob_maudio.c @@ -391,7 +391,10 @@ static int special_clk_ctl_put(struct snd_kcontrol *kctl, params->clk_lock); mutex_unlock(&bebob->mutex); - return err >= 0; + if (err >= 0) + err = 1; + + return err; } static struct snd_kcontrol_new special_clk_ctl = { .name = "Clock Source", @@ -491,14 +494,16 @@ static int special_dig_in_iface_ctl_set(struct snd_kcontrol *kctl, unsigned int id, dig_in_fmt, dig_in_iface; int err; - mutex_lock(&bebob->mutex); - id = uval->value.enumerated.item[0]; + if (id >= ARRAY_SIZE(special_dig_in_iface_labels)) + return -EINVAL; /* decode user value */ dig_in_fmt = (id >> 1) & 0x01; dig_in_iface = id & 0x01; + mutex_lock(&bebob->mutex); + err = avc_maudio_set_special_clk(bebob, params->clk_src, dig_in_fmt, @@ -508,14 +513,17 @@ static int special_dig_in_iface_ctl_set(struct snd_kcontrol *kctl, goto end; /* For ADAT, optical interface is only available. */ - if (params->dig_in_fmt > 0) + if (params->dig_in_fmt > 0) { + err = 1; goto end; + } /* For S/PDIF, optical/coaxial interfaces are selectable. */ err = avc_audio_set_selector(bebob->unit, 0x00, 0x04, dig_in_iface); if (err < 0) dev_err(&bebob->unit->device, "fail to set digital input interface: %d\n", err); + err = 1; end: special_stream_formation_set(bebob); mutex_unlock(&bebob->mutex); @@ -567,16 +575,20 @@ static int special_dig_out_iface_ctl_set(struct snd_kcontrol *kctl, unsigned int id; int err; - mutex_lock(&bebob->mutex); - id = uval->value.enumerated.item[0]; + if (id >= ARRAY_SIZE(special_dig_out_iface_labels)) + return -EINVAL; + + mutex_lock(&bebob->mutex); err = avc_maudio_set_special_clk(bebob, params->clk_src, params->dig_in_fmt, id, params->clk_lock); - if (err >= 0) + if (err >= 0) { special_stream_formation_set(bebob); + err = 1; + } mutex_unlock(&bebob->mutex); return err;