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authorTakashi Iwai <tiwai@suse.de>2018-04-02 19:50:41 +0200
committerTakashi Iwai <tiwai@suse.de>2018-04-02 19:50:59 +0200
commitbc334cb61b9ee6e85b9bb01519989a3ae8fe03f6 (patch)
tree34424a812537fe11beeee727b30b19c67193fe36 /sound/core/oss/pcm_oss.c
parent5607dddbfca774fb38bffadcb077fe03aa4ac5c6 (diff)
parentb44d419b98fae759b4f746186b1d1c8d01d962f2 (diff)
Merge branch 'for-next' into for-linus
Preparation for 4.17 merge. Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core/oss/pcm_oss.c')
-rw-r--r--sound/core/oss/pcm_oss.c185
1 files changed, 149 insertions, 36 deletions
diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index 441405081195..481ab0e94ffa 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -823,8 +823,25 @@ static int choose_rate(struct snd_pcm_substream *substream,
return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL);
}
-static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
- bool trylock)
+/* parameter locking: returns immediately if tried during streaming */
+static int lock_params(struct snd_pcm_runtime *runtime)
+{
+ if (mutex_lock_interruptible(&runtime->oss.params_lock))
+ return -ERESTARTSYS;
+ if (atomic_read(&runtime->oss.rw_ref)) {
+ mutex_unlock(&runtime->oss.params_lock);
+ return -EBUSY;
+ }
+ return 0;
+}
+
+static void unlock_params(struct snd_pcm_runtime *runtime)
+{
+ mutex_unlock(&runtime->oss.params_lock);
+}
+
+/* call with params_lock held */
+static int snd_pcm_oss_change_params_locked(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_pcm_hw_params *params, *sparams;
@@ -838,11 +855,8 @@ static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
const struct snd_mask *sformat_mask;
struct snd_mask mask;
- if (trylock) {
- if (!(mutex_trylock(&runtime->oss.params_lock)))
- return -EAGAIN;
- } else if (mutex_lock_interruptible(&runtime->oss.params_lock))
- return -ERESTARTSYS;
+ if (!runtime->oss.params)
+ return 0;
sw_params = kzalloc(sizeof(*sw_params), GFP_KERNEL);
params = kmalloc(sizeof(*params), GFP_KERNEL);
sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
@@ -1068,6 +1082,23 @@ failure:
kfree(sw_params);
kfree(params);
kfree(sparams);
+ return err;
+}
+
+/* this one takes the lock by itself */
+static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
+ bool trylock)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int err;
+
+ if (trylock) {
+ if (!(mutex_trylock(&runtime->oss.params_lock)))
+ return -EAGAIN;
+ } else if (mutex_lock_interruptible(&runtime->oss.params_lock))
+ return -ERESTARTSYS;
+
+ err = snd_pcm_oss_change_params_locked(substream);
mutex_unlock(&runtime->oss.params_lock);
return err;
}
@@ -1096,11 +1127,14 @@ static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_fil
return 0;
}
+/* call with params_lock held */
static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
{
int err;
struct snd_pcm_runtime *runtime = substream->runtime;
+ if (!runtime->oss.prepare)
+ return 0;
err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
if (err < 0) {
pcm_dbg(substream->pcm,
@@ -1120,8 +1154,6 @@ static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
struct snd_pcm_runtime *runtime;
int err;
- if (substream == NULL)
- return 0;
runtime = substream->runtime;
if (runtime->oss.params) {
err = snd_pcm_oss_change_params(substream, false);
@@ -1129,6 +1161,29 @@ static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
return err;
}
if (runtime->oss.prepare) {
+ if (mutex_lock_interruptible(&runtime->oss.params_lock))
+ return -ERESTARTSYS;
+ err = snd_pcm_oss_prepare(substream);
+ mutex_unlock(&runtime->oss.params_lock);
+ if (err < 0)
+ return err;
+ }
+ return 0;
+}
+
+/* call with params_lock held */
+static int snd_pcm_oss_make_ready_locked(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime;
+ int err;
+
+ runtime = substream->runtime;
+ if (runtime->oss.params) {
+ err = snd_pcm_oss_change_params_locked(substream);
+ if (err < 0)
+ return err;
+ }
+ if (runtime->oss.prepare) {
err = snd_pcm_oss_prepare(substream);
if (err < 0)
return err;
@@ -1332,13 +1387,15 @@ static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const cha
if (atomic_read(&substream->mmap_count))
return -ENXIO;
- if ((tmp = snd_pcm_oss_make_ready(substream)) < 0)
- return tmp;
+ atomic_inc(&runtime->oss.rw_ref);
while (bytes > 0) {
if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
tmp = -ERESTARTSYS;
break;
}
+ tmp = snd_pcm_oss_make_ready_locked(substream);
+ if (tmp < 0)
+ goto err;
if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
tmp = bytes;
if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
@@ -1394,6 +1451,7 @@ static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const cha
}
tmp = 0;
}
+ atomic_dec(&runtime->oss.rw_ref);
return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
}
@@ -1439,13 +1497,15 @@ static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __use
if (atomic_read(&substream->mmap_count))
return -ENXIO;
- if ((tmp = snd_pcm_oss_make_ready(substream)) < 0)
- return tmp;
+ atomic_inc(&runtime->oss.rw_ref);
while (bytes > 0) {
if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
tmp = -ERESTARTSYS;
break;
}
+ tmp = snd_pcm_oss_make_ready_locked(substream);
+ if (tmp < 0)
+ goto err;
if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
if (runtime->oss.buffer_used == 0) {
tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
@@ -1486,6 +1546,7 @@ static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __use
}
tmp = 0;
}
+ atomic_dec(&runtime->oss.rw_ref);
return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
}
@@ -1501,10 +1562,12 @@ static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
continue;
runtime = substream->runtime;
snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
+ mutex_lock(&runtime->oss.params_lock);
runtime->oss.prepare = 1;
runtime->oss.buffer_used = 0;
runtime->oss.prev_hw_ptr_period = 0;
runtime->oss.period_ptr = 0;
+ mutex_unlock(&runtime->oss.params_lock);
}
return 0;
}
@@ -1590,9 +1653,13 @@ static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
goto __direct;
if ((err = snd_pcm_oss_make_ready(substream)) < 0)
return err;
+ atomic_inc(&runtime->oss.rw_ref);
+ if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
+ atomic_dec(&runtime->oss.rw_ref);
+ return -ERESTARTSYS;
+ }
format = snd_pcm_oss_format_from(runtime->oss.format);
width = snd_pcm_format_physical_width(format);
- mutex_lock(&runtime->oss.params_lock);
if (runtime->oss.buffer_used > 0) {
#ifdef OSS_DEBUG
pcm_dbg(substream->pcm, "sync: buffer_used\n");
@@ -1602,10 +1669,8 @@ static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
runtime->oss.buffer + runtime->oss.buffer_used,
size);
err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
- if (err < 0) {
- mutex_unlock(&runtime->oss.params_lock);
- return err;
- }
+ if (err < 0)
+ goto unlock;
} else if (runtime->oss.period_ptr > 0) {
#ifdef OSS_DEBUG
pcm_dbg(substream->pcm, "sync: period_ptr\n");
@@ -1615,10 +1680,8 @@ static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
runtime->oss.buffer,
size * 8 / width);
err = snd_pcm_oss_sync1(substream, size);
- if (err < 0) {
- mutex_unlock(&runtime->oss.params_lock);
- return err;
- }
+ if (err < 0)
+ goto unlock;
}
/*
* The ALSA's period might be a bit large than OSS one.
@@ -1632,7 +1695,11 @@ static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
snd_pcm_lib_writev(substream, NULL, size);
}
+unlock:
mutex_unlock(&runtime->oss.params_lock);
+ atomic_dec(&runtime->oss.rw_ref);
+ if (err < 0)
+ return err;
/*
* finish sync: drain the buffer
*/
@@ -1643,7 +1710,9 @@ static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
substream->f_flags = saved_f_flags;
if (err < 0)
return err;
+ mutex_lock(&runtime->oss.params_lock);
runtime->oss.prepare = 1;
+ mutex_unlock(&runtime->oss.params_lock);
}
substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
@@ -1654,8 +1723,10 @@ static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
if (err < 0)
return err;
+ mutex_lock(&runtime->oss.params_lock);
runtime->oss.buffer_used = 0;
runtime->oss.prepare = 1;
+ mutex_unlock(&runtime->oss.params_lock);
}
return 0;
}
@@ -1667,6 +1738,8 @@ static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
for (idx = 1; idx >= 0; --idx) {
struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
struct snd_pcm_runtime *runtime;
+ int err;
+
if (substream == NULL)
continue;
runtime = substream->runtime;
@@ -1674,10 +1747,14 @@ static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
rate = 1000;
else if (rate > 192000)
rate = 192000;
+ err = lock_params(runtime);
+ if (err < 0)
+ return err;
if (runtime->oss.rate != rate) {
runtime->oss.params = 1;
runtime->oss.rate = rate;
}
+ unlock_params(runtime);
}
return snd_pcm_oss_get_rate(pcm_oss_file);
}
@@ -1702,13 +1779,19 @@ static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsig
for (idx = 1; idx >= 0; --idx) {
struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
struct snd_pcm_runtime *runtime;
+ int err;
+
if (substream == NULL)
continue;
runtime = substream->runtime;
+ err = lock_params(runtime);
+ if (err < 0)
+ return err;
if (runtime->oss.channels != channels) {
runtime->oss.params = 1;
runtime->oss.channels = channels;
}
+ unlock_params(runtime);
}
return snd_pcm_oss_get_channels(pcm_oss_file);
}
@@ -1781,6 +1864,7 @@ static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
{
int formats, idx;
+ int err;
if (format != AFMT_QUERY) {
formats = snd_pcm_oss_get_formats(pcm_oss_file);
@@ -1794,10 +1878,14 @@ static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int for
if (substream == NULL)
continue;
runtime = substream->runtime;
+ err = lock_params(runtime);
+ if (err < 0)
+ return err;
if (runtime->oss.format != format) {
runtime->oss.params = 1;
runtime->oss.format = format;
}
+ unlock_params(runtime);
}
}
return snd_pcm_oss_get_format(pcm_oss_file);
@@ -1817,8 +1905,6 @@ static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int s
{
struct snd_pcm_runtime *runtime;
- if (substream == NULL)
- return 0;
runtime = substream->runtime;
if (subdivide == 0) {
subdivide = runtime->oss.subdivision;
@@ -1842,9 +1928,17 @@ static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int
for (idx = 1; idx >= 0; --idx) {
struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
+ struct snd_pcm_runtime *runtime;
+
if (substream == NULL)
continue;
- if ((err = snd_pcm_oss_set_subdivide1(substream, subdivide)) < 0)
+ runtime = substream->runtime;
+ err = lock_params(runtime);
+ if (err < 0)
+ return err;
+ err = snd_pcm_oss_set_subdivide1(substream, subdivide);
+ unlock_params(runtime);
+ if (err < 0)
return err;
}
return err;
@@ -1854,8 +1948,6 @@ static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsign
{
struct snd_pcm_runtime *runtime;
- if (substream == NULL)
- return 0;
runtime = substream->runtime;
if (runtime->oss.subdivision || runtime->oss.fragshift)
return -EINVAL;
@@ -1875,9 +1967,17 @@ static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsig
for (idx = 1; idx >= 0; --idx) {
struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
+ struct snd_pcm_runtime *runtime;
+
if (substream == NULL)
continue;
- if ((err = snd_pcm_oss_set_fragment1(substream, val)) < 0)
+ runtime = substream->runtime;
+ err = lock_params(runtime);
+ if (err < 0)
+ return err;
+ err = snd_pcm_oss_set_fragment1(substream, val);
+ unlock_params(runtime);
+ if (err < 0)
return err;
}
return err;
@@ -1961,6 +2061,9 @@ static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int tr
}
if (psubstream) {
runtime = psubstream->runtime;
+ cmd = 0;
+ if (mutex_lock_interruptible(&runtime->oss.params_lock))
+ return -ERESTARTSYS;
if (trigger & PCM_ENABLE_OUTPUT) {
if (runtime->oss.trigger)
goto _skip1;
@@ -1978,13 +2081,19 @@ static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int tr
cmd = SNDRV_PCM_IOCTL_DROP;
runtime->oss.prepare = 1;
}
- err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
- if (err < 0)
- return err;
- }
_skip1:
+ mutex_unlock(&runtime->oss.params_lock);
+ if (cmd) {
+ err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
+ if (err < 0)
+ return err;
+ }
+ }
if (csubstream) {
runtime = csubstream->runtime;
+ cmd = 0;
+ if (mutex_lock_interruptible(&runtime->oss.params_lock))
+ return -ERESTARTSYS;
if (trigger & PCM_ENABLE_INPUT) {
if (runtime->oss.trigger)
goto _skip2;
@@ -1999,11 +2108,14 @@ static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int tr
cmd = SNDRV_PCM_IOCTL_DROP;
runtime->oss.prepare = 1;
}
- err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
- if (err < 0)
- return err;
- }
_skip2:
+ mutex_unlock(&runtime->oss.params_lock);
+ if (cmd) {
+ err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
+ if (err < 0)
+ return err;
+ }
+ }
return 0;
}
@@ -2255,6 +2367,7 @@ static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
runtime->oss.maxfrags = 0;
runtime->oss.subdivision = 0;
substream->pcm_release = snd_pcm_oss_release_substream;
+ atomic_set(&runtime->oss.rw_ref, 0);
}
static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)