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Subject[PATCH 4.14 12/50] ALSA: hda/hdmi: Use single mutex unlock in error paths
Date
From: Takashi Iwai <tiwai@suse.de>

commit f69548ffafcc4942022f16f2f192b24143de1dba upstream

Instead of calling mutex_unlock() at each error path multiple times,
take the standard goto-and-a-single-unlock approach. This will
simplify the code and make easier to find the unbalanced mutex locks.

No functional changes, but only the code readability improvement as a
preliminary work for further changes.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
sound/pci/hda/patch_hdmi.c | 67 ++++++++++++++++++++++-----------------------
1 file changed, 33 insertions(+), 34 deletions(-)

--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -339,13 +339,13 @@ static int hdmi_eld_ctl_info(struct snd_
if (!per_pin) {
/* no pin is bound to the pcm */
uinfo->count = 0;
- mutex_unlock(&spec->pcm_lock);
- return 0;
+ goto unlock;
}
eld = &per_pin->sink_eld;
uinfo->count = eld->eld_valid ? eld->eld_size : 0;
- mutex_unlock(&spec->pcm_lock);

+ unlock:
+ mutex_unlock(&spec->pcm_lock);
return 0;
}

@@ -357,6 +357,7 @@ static int hdmi_eld_ctl_get(struct snd_k
struct hdmi_spec_per_pin *per_pin;
struct hdmi_eld *eld;
int pcm_idx;
+ int err = 0;

pcm_idx = kcontrol->private_value;
mutex_lock(&spec->pcm_lock);
@@ -365,16 +366,15 @@ static int hdmi_eld_ctl_get(struct snd_k
/* no pin is bound to the pcm */
memset(ucontrol->value.bytes.data, 0,
ARRAY_SIZE(ucontrol->value.bytes.data));
- mutex_unlock(&spec->pcm_lock);
- return 0;
+ goto unlock;
}
- eld = &per_pin->sink_eld;

+ eld = &per_pin->sink_eld;
if (eld->eld_size > ARRAY_SIZE(ucontrol->value.bytes.data) ||
eld->eld_size > ELD_MAX_SIZE) {
- mutex_unlock(&spec->pcm_lock);
snd_BUG();
- return -EINVAL;
+ err = -EINVAL;
+ goto unlock;
}

memset(ucontrol->value.bytes.data, 0,
@@ -382,9 +382,10 @@ static int hdmi_eld_ctl_get(struct snd_k
if (eld->eld_valid)
memcpy(ucontrol->value.bytes.data, eld->eld_buffer,
eld->eld_size);
- mutex_unlock(&spec->pcm_lock);

- return 0;
+ unlock:
+ mutex_unlock(&spec->pcm_lock);
+ return err;
}

static const struct snd_kcontrol_new eld_bytes_ctl = {
@@ -1209,8 +1210,8 @@ static int hdmi_pcm_open(struct hda_pcm_
pin_idx = hinfo_to_pin_index(codec, hinfo);
if (!spec->dyn_pcm_assign) {
if (snd_BUG_ON(pin_idx < 0)) {
- mutex_unlock(&spec->pcm_lock);
- return -EINVAL;
+ err = -EINVAL;
+ goto unlock;
}
} else {
/* no pin is assigned to the PCM
@@ -1218,16 +1219,13 @@ static int hdmi_pcm_open(struct hda_pcm_
*/
if (pin_idx < 0) {
err = hdmi_pcm_open_no_pin(hinfo, codec, substream);
- mutex_unlock(&spec->pcm_lock);
- return err;
+ goto unlock;
}
}

err = hdmi_choose_cvt(codec, pin_idx, &cvt_idx);
- if (err < 0) {
- mutex_unlock(&spec->pcm_lock);
- return err;
- }
+ if (err < 0)
+ goto unlock;

per_cvt = get_cvt(spec, cvt_idx);
/* Claim converter */
@@ -1264,12 +1262,11 @@ static int hdmi_pcm_open(struct hda_pcm_
per_cvt->assigned = 0;
hinfo->nid = 0;
snd_hda_spdif_ctls_unassign(codec, pcm_idx);
- mutex_unlock(&spec->pcm_lock);
- return -ENODEV;
+ err = -ENODEV;
+ goto unlock;
}
}

- mutex_unlock(&spec->pcm_lock);
/* Store the updated parameters */
runtime->hw.channels_min = hinfo->channels_min;
runtime->hw.channels_max = hinfo->channels_max;
@@ -1278,7 +1275,9 @@ static int hdmi_pcm_open(struct hda_pcm_

snd_pcm_hw_constraint_step(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_CHANNELS, 2);
- return 0;
+ unlock:
+ mutex_unlock(&spec->pcm_lock);
+ return err;
}

/*
@@ -1876,7 +1875,7 @@ static int generic_hdmi_playback_pcm_pre
struct snd_pcm_runtime *runtime = substream->runtime;
bool non_pcm;
int pinctl;
- int err;
+ int err = 0;

mutex_lock(&spec->pcm_lock);
pin_idx = hinfo_to_pin_index(codec, hinfo);
@@ -1888,13 +1887,12 @@ static int generic_hdmi_playback_pcm_pre
pin_cvt_fixup(codec, NULL, cvt_nid);
snd_hda_codec_setup_stream(codec, cvt_nid,
stream_tag, 0, format);
- mutex_unlock(&spec->pcm_lock);
- return 0;
+ goto unlock;
}

if (snd_BUG_ON(pin_idx < 0)) {
- mutex_unlock(&spec->pcm_lock);
- return -EINVAL;
+ err = -EINVAL;
+ goto unlock;
}
per_pin = get_pin(spec, pin_idx);
pin_nid = per_pin->pin_nid;
@@ -1933,6 +1931,7 @@ static int generic_hdmi_playback_pcm_pre
/* snd_hda_set_dev_select() has been called before */
err = spec->ops.setup_stream(codec, cvt_nid, pin_nid,
stream_tag, format);
+ unlock:
mutex_unlock(&spec->pcm_lock);
return err;
}
@@ -1954,6 +1953,7 @@ static int hdmi_pcm_close(struct hda_pcm
struct hdmi_spec_per_cvt *per_cvt;
struct hdmi_spec_per_pin *per_pin;
int pinctl;
+ int err = 0;

if (hinfo->nid) {
pcm_idx = hinfo_to_pcm_index(codec, hinfo);
@@ -1972,14 +1972,12 @@ static int hdmi_pcm_close(struct hda_pcm
snd_hda_spdif_ctls_unassign(codec, pcm_idx);
clear_bit(pcm_idx, &spec->pcm_in_use);
pin_idx = hinfo_to_pin_index(codec, hinfo);
- if (spec->dyn_pcm_assign && pin_idx < 0) {
- mutex_unlock(&spec->pcm_lock);
- return 0;
- }
+ if (spec->dyn_pcm_assign && pin_idx < 0)
+ goto unlock;

if (snd_BUG_ON(pin_idx < 0)) {
- mutex_unlock(&spec->pcm_lock);
- return -EINVAL;
+ err = -EINVAL;
+ goto unlock;
}
per_pin = get_pin(spec, pin_idx);

@@ -1998,10 +1996,11 @@ static int hdmi_pcm_close(struct hda_pcm
per_pin->setup = false;
per_pin->channels = 0;
mutex_unlock(&per_pin->lock);
+ unlock:
mutex_unlock(&spec->pcm_lock);
}

- return 0;
+ return err;
}

static const struct hda_pcm_ops generic_ops = {

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