aboutsummaryrefslogtreecommitdiffstats
path: root/sound/core/pcm_native.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--sound/core/pcm_native.c113
1 files changed, 79 insertions, 34 deletions
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 0860c5a84502..439f047929e1 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -71,8 +71,9 @@ static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
*/
DEFINE_RWLOCK(snd_pcm_link_rwlock);
-static DECLARE_RWSEM(snd_pcm_link_rwsem);
+EXPORT_SYMBOL(snd_pcm_link_rwlock);
+static DECLARE_RWSEM(snd_pcm_link_rwsem);
static inline mm_segment_t snd_enter_user(void)
{
@@ -319,6 +320,8 @@ int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
return 0;
}
+EXPORT_SYMBOL(snd_pcm_hw_refine);
+
static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params __user * _params)
{
@@ -369,7 +372,7 @@ static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
if (!substream->oss.oss)
#endif
- if (atomic_read(&runtime->mmap_count))
+ if (atomic_read(&substream->mmap_count))
return -EBADFD;
params->rmask = ~0U;
@@ -482,7 +485,7 @@ static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
return -EBADFD;
}
snd_pcm_stream_unlock_irq(substream);
- if (atomic_read(&runtime->mmap_count))
+ if (atomic_read(&substream->mmap_count))
return -EBADFD;
if (substream->ops->hw_free)
result = substream->ops->hw_free(substream);
@@ -936,6 +939,8 @@ int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
return snd_pcm_action(&snd_pcm_action_stop, substream, state);
}
+EXPORT_SYMBOL(snd_pcm_stop);
+
/**
* snd_pcm_drain_done
* @substream: the PCM substream
@@ -1085,6 +1090,8 @@ int snd_pcm_suspend(struct snd_pcm_substream *substream)
return err;
}
+EXPORT_SYMBOL(snd_pcm_suspend);
+
/**
* snd_pcm_suspend_all
* @pcm: the PCM instance
@@ -1114,6 +1121,8 @@ int snd_pcm_suspend_all(struct snd_pcm *pcm)
return 0;
}
+EXPORT_SYMBOL(snd_pcm_suspend_all);
+
/* resume */
static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
@@ -1275,13 +1284,16 @@ static int snd_pcm_reset(struct snd_pcm_substream *substream)
/*
* prepare ioctl
*/
-static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, int state)
+/* we use the second argument for updating f_flags */
+static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
+ int f_flags)
{
struct snd_pcm_runtime *runtime = substream->runtime;
if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
return -EBADFD;
if (snd_pcm_running(substream))
return -EBUSY;
+ substream->f_flags = f_flags;
return 0;
}
@@ -1310,17 +1322,26 @@ static struct action_ops snd_pcm_action_prepare = {
/**
* snd_pcm_prepare
* @substream: the PCM substream instance
+ * @file: file to refer f_flags
*
* Prepare the PCM substream to be triggerable.
*/
-static int snd_pcm_prepare(struct snd_pcm_substream *substream)
+static int snd_pcm_prepare(struct snd_pcm_substream *substream,
+ struct file *file)
{
int res;
struct snd_card *card = substream->pcm->card;
+ int f_flags;
+
+ if (file)
+ f_flags = file->f_flags;
+ else
+ f_flags = substream->f_flags;
snd_power_lock(card);
if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
- res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, substream, 0);
+ res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
+ substream, f_flags);
snd_power_unlock(card);
return res;
}
@@ -1331,7 +1352,7 @@ static int snd_pcm_prepare(struct snd_pcm_substream *substream)
static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
{
- if (substream->ffile->f_flags & O_NONBLOCK)
+ if (substream->f_flags & O_NONBLOCK)
return -EAGAIN;
substream->runtime->trigger_master = substream;
return 0;
@@ -1448,8 +1469,6 @@ static int snd_pcm_drain(struct snd_pcm_substream *substream)
}
}
up_read(&snd_pcm_link_rwsem);
- if (! num_drecs)
- goto _error;
snd_pcm_stream_lock_irq(substream);
/* resume pause */
@@ -2006,6 +2025,10 @@ static void pcm_release_private(struct snd_pcm_substream *substream)
void snd_pcm_release_substream(struct snd_pcm_substream *substream)
{
+ substream->ref_count--;
+ if (substream->ref_count > 0)
+ return;
+
snd_pcm_drop(substream);
if (substream->hw_opened) {
if (substream->ops->hw_free != NULL)
@@ -2020,6 +2043,8 @@ void snd_pcm_release_substream(struct snd_pcm_substream *substream)
snd_pcm_detach_substream(substream);
}
+EXPORT_SYMBOL(snd_pcm_release_substream);
+
int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
struct file *file,
struct snd_pcm_substream **rsubstream)
@@ -2030,6 +2055,11 @@ int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
err = snd_pcm_attach_substream(pcm, stream, file, &substream);
if (err < 0)
return err;
+ if (substream->ref_count > 1) {
+ *rsubstream = substream;
+ return 0;
+ }
+
substream->no_mmap_ctrl = 0;
err = snd_pcm_hw_constraints_init(substream);
if (err < 0) {
@@ -2056,6 +2086,8 @@ int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
return err;
}
+EXPORT_SYMBOL(snd_pcm_open_substream);
+
static int snd_pcm_open_file(struct file *file,
struct snd_pcm *pcm,
int stream,
@@ -2073,17 +2105,20 @@ static int snd_pcm_open_file(struct file *file,
if (err < 0)
return err;
- pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
- if (pcm_file == NULL) {
- snd_pcm_release_substream(substream);
- return -ENOMEM;
+ if (substream->ref_count > 1)
+ pcm_file = substream->file;
+ else {
+ pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
+ if (pcm_file == NULL) {
+ snd_pcm_release_substream(substream);
+ return -ENOMEM;
+ }
+ str = substream->pstr;
+ substream->file = pcm_file;
+ substream->pcm_release = pcm_release_private;
+ pcm_file->substream = substream;
+ snd_pcm_add_file(str, pcm_file);
}
- str = substream->pstr;
- substream->file = pcm_file;
- substream->pcm_release = pcm_release_private;
- pcm_file->substream = substream;
- snd_pcm_add_file(str, pcm_file);
-
file->private_data = pcm_file;
*rpcm_file = pcm_file;
return 0;
@@ -2170,7 +2205,6 @@ static int snd_pcm_release(struct inode *inode, struct file *file)
pcm_file = file->private_data;
substream = pcm_file->substream;
snd_assert(substream != NULL, return -ENXIO);
- snd_assert(!atomic_read(&substream->runtime->mmap_count), );
pcm = substream->pcm;
fasync_helper(-1, file, 0, &substream->runtime->fasync);
mutex_lock(&pcm->open_mutex);
@@ -2493,7 +2527,8 @@ static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
return 0;
}
-static int snd_pcm_common_ioctl1(struct snd_pcm_substream *substream,
+static int snd_pcm_common_ioctl1(struct file *file,
+ struct snd_pcm_substream *substream,
unsigned int cmd, void __user *arg)
{
snd_assert(substream != NULL, return -ENXIO);
@@ -2518,7 +2553,7 @@ static int snd_pcm_common_ioctl1(struct snd_pcm_substream *substream,
case SNDRV_PCM_IOCTL_CHANNEL_INFO:
return snd_pcm_channel_info_user(substream, arg);
case SNDRV_PCM_IOCTL_PREPARE:
- return snd_pcm_prepare(substream);
+ return snd_pcm_prepare(substream, file);
case SNDRV_PCM_IOCTL_RESET:
return snd_pcm_reset(substream);
case SNDRV_PCM_IOCTL_START:
@@ -2560,7 +2595,8 @@ static int snd_pcm_common_ioctl1(struct snd_pcm_substream *substream,
return -ENOTTY;
}
-static int snd_pcm_playback_ioctl1(struct snd_pcm_substream *substream,
+static int snd_pcm_playback_ioctl1(struct file *file,
+ struct snd_pcm_substream *substream,
unsigned int cmd, void __user *arg)
{
snd_assert(substream != NULL, return -ENXIO);
@@ -2636,10 +2672,11 @@ static int snd_pcm_playback_ioctl1(struct snd_pcm_substream *substream,
return result < 0 ? result : 0;
}
}
- return snd_pcm_common_ioctl1(substream, cmd, arg);
+ return snd_pcm_common_ioctl1(file, substream, cmd, arg);
}
-static int snd_pcm_capture_ioctl1(struct snd_pcm_substream *substream,
+static int snd_pcm_capture_ioctl1(struct file *file,
+ struct snd_pcm_substream *substream,
unsigned int cmd, void __user *arg)
{
snd_assert(substream != NULL, return -ENXIO);
@@ -2715,7 +2752,7 @@ static int snd_pcm_capture_ioctl1(struct snd_pcm_substream *substream,
return result < 0 ? result : 0;
}
}
- return snd_pcm_common_ioctl1(substream, cmd, arg);
+ return snd_pcm_common_ioctl1(file, substream, cmd, arg);
}
static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
@@ -2728,7 +2765,8 @@ static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
if (((cmd >> 8) & 0xff) != 'A')
return -ENOTTY;
- return snd_pcm_playback_ioctl1(pcm_file->substream, cmd, (void __user *)arg);
+ return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
+ (void __user *)arg);
}
static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
@@ -2741,7 +2779,8 @@ static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
if (((cmd >> 8) & 0xff) != 'A')
return -ENOTTY;
- return snd_pcm_capture_ioctl1(pcm_file->substream, cmd, (void __user *)arg);
+ return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
+ (void __user *)arg);
}
int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
@@ -2753,12 +2792,12 @@ int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
fs = snd_enter_user();
switch (substream->stream) {
case SNDRV_PCM_STREAM_PLAYBACK:
- result = snd_pcm_playback_ioctl1(substream,
- cmd, (void __user *)arg);
+ result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
+ (void __user *)arg);
break;
case SNDRV_PCM_STREAM_CAPTURE:
- result = snd_pcm_capture_ioctl1(substream,
- cmd, (void __user *)arg);
+ result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
+ (void __user *)arg);
break;
default:
result = -EINVAL;
@@ -2768,6 +2807,8 @@ int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
return result;
}
+EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
+
static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
loff_t * offset)
{
@@ -3134,7 +3175,7 @@ static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
area->vm_ops = &snd_pcm_vm_ops_data;
area->vm_private_data = substream;
area->vm_flags |= VM_RESERVED;
- atomic_inc(&substream->runtime->mmap_count);
+ atomic_inc(&substream->mmap_count);
return 0;
}
@@ -3166,9 +3207,11 @@ int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
(substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
size, area->vm_page_prot))
return -EAGAIN;
- atomic_inc(&substream->runtime->mmap_count);
+ atomic_inc(&substream->mmap_count);
return 0;
}
+
+EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
#endif /* SNDRV_PCM_INFO_MMAP */
/*
@@ -3212,6 +3255,8 @@ int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
return snd_pcm_default_mmap(substream, area);
}
+EXPORT_SYMBOL(snd_pcm_mmap_data);
+
static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
{
struct snd_pcm_file * pcm_file;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.