diff options
author | Takashi Iwai <tiwai@suse.de> | 2022-09-26 16:55:48 +0300 |
---|---|---|
committer | Takashi Iwai <tiwai@suse.de> | 2022-09-27 09:44:05 +0300 |
commit | f0061c18c169f0c32d96b59485c3edee85e343ed (patch) | |
tree | 1ce7b4b5d34cb4f01d64287bbcf14436b365f30b /sound/core/pcm_native.c | |
parent | 69ab6f5b00b1804ea42b375ca30d818d169cae82 (diff) | |
download | linux-f0061c18c169f0c32d96b59485c3edee85e343ed.tar.xz |
ALSA: pcm: Avoid reference to status->state
In the PCM core and driver code, there are lots place referring to the
current PCM state via runtime->status->state. This patch introduced a
local PCM state in runtime itself and replaces those references with
runtime->state. It has improvements in two aspects:
- The reduction of a indirect access leads to more code optimization
- It avoids a possible (unexpected) modification of the state via mmap
of the status record
The status->state is updated together with runtime->state, so that
user-space can still read the current state via mmap like before,
too.
This patch touches only the ALSA core code. The changes in each
driver will follow in later patches.
Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20220926135558.26580-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core/pcm_native.c')
-rw-r--r-- | sound/core/pcm_native.c | 127 |
1 files changed, 64 insertions, 63 deletions
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index ad0541e9e888..d9485b1ab719 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -595,8 +595,8 @@ static void snd_pcm_set_state(struct snd_pcm_substream *substream, snd_pcm_state_t state) { snd_pcm_stream_lock_irq(substream); - if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) - substream->runtime->status->state = state; + if (substream->runtime->state != SNDRV_PCM_STATE_DISCONNECTED) + __snd_pcm_set_state(substream->runtime, state); snd_pcm_stream_unlock_irq(substream); } @@ -724,7 +724,7 @@ static int snd_pcm_hw_params(struct snd_pcm_substream *substream, if (err < 0) return err; snd_pcm_stream_lock_irq(substream); - switch (runtime->status->state) { + switch (runtime->state) { case SNDRV_PCM_STATE_OPEN: case SNDRV_PCM_STATE_SETUP: case SNDRV_PCM_STATE_PREPARED: @@ -889,7 +889,7 @@ static int snd_pcm_hw_free(struct snd_pcm_substream *substream) if (result < 0) return result; snd_pcm_stream_lock_irq(substream); - switch (runtime->status->state) { + switch (runtime->state) { case SNDRV_PCM_STATE_SETUP: case SNDRV_PCM_STATE_PREPARED: if (atomic_read(&substream->mmap_count)) @@ -920,7 +920,7 @@ static int snd_pcm_sw_params(struct snd_pcm_substream *substream, return -ENXIO; runtime = substream->runtime; snd_pcm_stream_lock_irq(substream); - if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { + if (runtime->state == SNDRV_PCM_STATE_OPEN) { snd_pcm_stream_unlock_irq(substream); return -EBADFD; } @@ -1013,8 +1013,8 @@ int snd_pcm_status64(struct snd_pcm_substream *substream, } else runtime->audio_tstamp_report.valid = 1; - status->state = runtime->status->state; - status->suspended_state = runtime->status->suspended_state; + status->state = runtime->state; + status->suspended_state = runtime->suspended_state; if (status->state == SNDRV_PCM_STATE_OPEN) goto _end; status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec; @@ -1148,7 +1148,7 @@ static int snd_pcm_channel_info(struct snd_pcm_substream *substream, channel = info->channel; runtime = substream->runtime; snd_pcm_stream_lock_irq(substream); - if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { + if (runtime->state == SNDRV_PCM_STATE_OPEN) { snd_pcm_stream_unlock_irq(substream); return -EBADFD; } @@ -1411,7 +1411,7 @@ static int snd_pcm_pre_start(struct snd_pcm_substream *substream, snd_pcm_state_t state) { struct snd_pcm_runtime *runtime = substream->runtime; - if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) + if (runtime->state != SNDRV_PCM_STATE_PREPARED) return -EBADFD; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && !snd_pcm_playback_data(substream)) @@ -1444,7 +1444,7 @@ static void snd_pcm_post_start(struct snd_pcm_substream *substream, runtime->hw_ptr_jiffies = jiffies; runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / runtime->rate; - runtime->status->state = state; + __snd_pcm_set_state(runtime, state); if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && runtime->silence_size > 0) snd_pcm_playback_silence(substream, ULONG_MAX); @@ -1485,7 +1485,7 @@ static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) { struct snd_pcm_runtime *runtime = substream->runtime; - if (runtime->status->state == SNDRV_PCM_STATE_OPEN) + if (runtime->state == SNDRV_PCM_STATE_OPEN) return -EBADFD; runtime->trigger_master = substream; return 0; @@ -1506,9 +1506,9 @@ static void snd_pcm_post_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) { struct snd_pcm_runtime *runtime = substream->runtime; - if (runtime->status->state != state) { + if (runtime->state != state) { snd_pcm_trigger_tstamp(substream); - runtime->status->state = state; + __snd_pcm_set_state(runtime, state); snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); } wake_up(&runtime->sleep); @@ -1584,9 +1584,9 @@ static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) return -ENOSYS; if (pause_pushed(state)) { - if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) + if (runtime->state != SNDRV_PCM_STATE_RUNNING) return -EBADFD; - } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) + } else if (runtime->state != SNDRV_PCM_STATE_PAUSED) return -EBADFD; runtime->trigger_master = substream; return 0; @@ -1628,12 +1628,12 @@ static void snd_pcm_post_pause(struct snd_pcm_substream *substream, struct snd_pcm_runtime *runtime = substream->runtime; snd_pcm_trigger_tstamp(substream); if (pause_pushed(state)) { - runtime->status->state = SNDRV_PCM_STATE_PAUSED; + __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_PAUSED); snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); wake_up(&runtime->sleep); wake_up(&runtime->tsleep); } else { - runtime->status->state = SNDRV_PCM_STATE_RUNNING; + __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_RUNNING); snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); } } @@ -1668,7 +1668,7 @@ static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, snd_pcm_state_t state) { struct snd_pcm_runtime *runtime = substream->runtime; - switch (runtime->status->state) { + switch (runtime->state) { case SNDRV_PCM_STATE_SUSPENDED: return -EBUSY; /* unresumable PCM state; return -EBUSY for skipping suspend */ @@ -1699,8 +1699,9 @@ static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, { struct snd_pcm_runtime *runtime = substream->runtime; snd_pcm_trigger_tstamp(substream); - runtime->status->suspended_state = runtime->status->state; - runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; + runtime->suspended_state = runtime->state; + runtime->status->suspended_state = runtime->suspended_state; + __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SUSPENDED); snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); wake_up(&runtime->sleep); wake_up(&runtime->tsleep); @@ -1791,8 +1792,8 @@ static int snd_pcm_do_resume(struct snd_pcm_substream *substream, if (runtime->trigger_master != substream) return 0; /* DMA not running previously? */ - if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && - (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || + if (runtime->suspended_state != SNDRV_PCM_STATE_RUNNING && + (runtime->suspended_state != SNDRV_PCM_STATE_DRAINING || substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) return 0; return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); @@ -1811,7 +1812,7 @@ static void snd_pcm_post_resume(struct snd_pcm_substream *substream, { struct snd_pcm_runtime *runtime = substream->runtime; snd_pcm_trigger_tstamp(substream); - runtime->status->state = runtime->status->suspended_state; + __snd_pcm_set_state(runtime, runtime->suspended_state); snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); } @@ -1848,7 +1849,7 @@ static int snd_pcm_xrun(struct snd_pcm_substream *substream) int result; snd_pcm_stream_lock_irq(substream); - switch (runtime->status->state) { + switch (runtime->state) { case SNDRV_PCM_STATE_XRUN: result = 0; /* already there */ break; @@ -1871,7 +1872,7 @@ static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, snd_pcm_state_t state) { struct snd_pcm_runtime *runtime = substream->runtime; - switch (runtime->status->state) { + switch (runtime->state) { case SNDRV_PCM_STATE_RUNNING: case SNDRV_PCM_STATE_PREPARED: case SNDRV_PCM_STATE_PAUSED: @@ -1933,8 +1934,8 @@ static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, struct snd_pcm_runtime *runtime = substream->runtime; int f_flags = (__force int)state; - if (runtime->status->state == SNDRV_PCM_STATE_OPEN || - runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) + if (runtime->state == SNDRV_PCM_STATE_OPEN || + runtime->state == SNDRV_PCM_STATE_DISCONNECTED) return -EBADFD; if (snd_pcm_running(substream)) return -EBUSY; @@ -1985,7 +1986,7 @@ static int snd_pcm_prepare(struct snd_pcm_substream *substream, f_flags = substream->f_flags; snd_pcm_stream_lock_irq(substream); - switch (substream->runtime->status->state) { + switch (substream->runtime->state) { case SNDRV_PCM_STATE_PAUSED: snd_pcm_pause(substream, false); fallthrough; @@ -2009,7 +2010,7 @@ static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, snd_pcm_state_t state) { struct snd_pcm_runtime *runtime = substream->runtime; - switch (runtime->status->state) { + switch (runtime->state) { case SNDRV_PCM_STATE_OPEN: case SNDRV_PCM_STATE_DISCONNECTED: case SNDRV_PCM_STATE_SUSPENDED: @@ -2024,28 +2025,28 @@ static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, { struct snd_pcm_runtime *runtime = substream->runtime; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { - switch (runtime->status->state) { + switch (runtime->state) { case SNDRV_PCM_STATE_PREPARED: /* start playback stream if possible */ if (! snd_pcm_playback_empty(substream)) { snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); } else { - runtime->status->state = SNDRV_PCM_STATE_SETUP; + __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP); } break; case SNDRV_PCM_STATE_RUNNING: - runtime->status->state = SNDRV_PCM_STATE_DRAINING; + __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_DRAINING); break; case SNDRV_PCM_STATE_XRUN: - runtime->status->state = SNDRV_PCM_STATE_SETUP; + __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP); break; default: break; } } else { /* stop running stream */ - if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { + if (runtime->state == SNDRV_PCM_STATE_RUNNING) { snd_pcm_state_t new_state; new_state = snd_pcm_capture_avail(runtime) > 0 ? @@ -2055,7 +2056,7 @@ static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, } } - if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && + if (runtime->state == SNDRV_PCM_STATE_DRAINING && runtime->trigger_master == substream && (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) return substream->ops->trigger(substream, @@ -2096,7 +2097,7 @@ static int snd_pcm_drain(struct snd_pcm_substream *substream, card = substream->pcm->card; runtime = substream->runtime; - if (runtime->status->state == SNDRV_PCM_STATE_OPEN) + if (runtime->state == SNDRV_PCM_STATE_OPEN) return -EBADFD; if (file) { @@ -2107,7 +2108,7 @@ static int snd_pcm_drain(struct snd_pcm_substream *substream, snd_pcm_stream_lock_irq(substream); /* resume pause */ - if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) + if (runtime->state == SNDRV_PCM_STATE_PAUSED) snd_pcm_pause(substream, false); /* pre-start/stop - all running streams are changed to DRAINING state */ @@ -2135,7 +2136,7 @@ static int snd_pcm_drain(struct snd_pcm_substream *substream, if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) continue; runtime = s->runtime; - if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { + if (runtime->state == SNDRV_PCM_STATE_DRAINING) { to_check = runtime; break; } @@ -2174,7 +2175,7 @@ static int snd_pcm_drain(struct snd_pcm_substream *substream, break; } if (tout == 0) { - if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) + if (substream->runtime->state == SNDRV_PCM_STATE_SUSPENDED) result = -ESTRPIPE; else { dev_dbg(substream->pcm->card->dev, @@ -2206,13 +2207,13 @@ static int snd_pcm_drop(struct snd_pcm_substream *substream) return -ENXIO; runtime = substream->runtime; - if (runtime->status->state == SNDRV_PCM_STATE_OPEN || - runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) + if (runtime->state == SNDRV_PCM_STATE_OPEN || + runtime->state == SNDRV_PCM_STATE_DISCONNECTED) return -EBADFD; snd_pcm_stream_lock_irq(substream); /* resume pause */ - if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) + if (runtime->state == SNDRV_PCM_STATE_PAUSED) snd_pcm_pause(substream, false); snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); @@ -2275,8 +2276,8 @@ static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) snd_pcm_group_init(group); down_write(&snd_pcm_link_rwsem); - if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || - substream->runtime->status->state != substream1->runtime->status->state || + if (substream->runtime->state == SNDRV_PCM_STATE_OPEN || + substream->runtime->state != substream1->runtime->state || substream->pcm->nonatomic != substream1->pcm->nonatomic) { res = -EBADFD; goto _end; @@ -2700,7 +2701,7 @@ void snd_pcm_release_substream(struct snd_pcm_substream *substream) snd_pcm_drop(substream); if (substream->hw_opened) { - if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) + if (substream->runtime->state != SNDRV_PCM_STATE_OPEN) do_hw_free(substream); substream->ops->close(substream); substream->hw_opened = 0; @@ -2904,7 +2905,7 @@ static int snd_pcm_release(struct inode *inode, struct file *file) */ static int do_pcm_hwsync(struct snd_pcm_substream *substream) { - switch (substream->runtime->status->state) { + switch (substream->runtime->state) { case SNDRV_PCM_STATE_DRAINING: if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) return -EBADFD; @@ -3203,7 +3204,7 @@ static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, struct snd_pcm_runtime *runtime = substream->runtime; snd_pcm_sframes_t result; - if (runtime->status->state == SNDRV_PCM_STATE_OPEN) + if (runtime->state == SNDRV_PCM_STATE_OPEN) return -EBADFD; if (put_user(0, &_xferi->result)) return -EFAULT; @@ -3226,7 +3227,7 @@ static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, void *bufs; snd_pcm_sframes_t result; - if (runtime->status->state == SNDRV_PCM_STATE_OPEN) + if (runtime->state == SNDRV_PCM_STATE_OPEN) return -EBADFD; if (runtime->channels > 128) return -EINVAL; @@ -3290,7 +3291,7 @@ static int snd_pcm_common_ioctl(struct file *file, if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; - if (substream->runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) + if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED) return -EBADFD; res = snd_power_wait(substream->pcm->card); @@ -3421,7 +3422,7 @@ int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, snd_pcm_uframes_t *frames = arg; snd_pcm_sframes_t result; - if (substream->runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) + if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED) return -EBADFD; switch (cmd) { @@ -3466,8 +3467,8 @@ static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; runtime = substream->runtime; - if (runtime->status->state == SNDRV_PCM_STATE_OPEN || - runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) + if (runtime->state == SNDRV_PCM_STATE_OPEN || + runtime->state == SNDRV_PCM_STATE_DISCONNECTED) return -EBADFD; if (!frame_aligned(runtime, count)) return -EINVAL; @@ -3491,8 +3492,8 @@ static ssize_t snd_pcm_write(struct file *file, const char __user *buf, if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; runtime = substream->runtime; - if (runtime->status->state == SNDRV_PCM_STATE_OPEN || - runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) + if (runtime->state == SNDRV_PCM_STATE_OPEN || + runtime->state == SNDRV_PCM_STATE_DISCONNECTED) return -EBADFD; if (!frame_aligned(runtime, count)) return -EINVAL; @@ -3518,8 +3519,8 @@ static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; runtime = substream->runtime; - if (runtime->status->state == SNDRV_PCM_STATE_OPEN || - runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) + if (runtime->state == SNDRV_PCM_STATE_OPEN || + runtime->state == SNDRV_PCM_STATE_DISCONNECTED) return -EBADFD; if (!iter_is_iovec(to)) return -EINVAL; @@ -3555,8 +3556,8 @@ static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; runtime = substream->runtime; - if (runtime->status->state == SNDRV_PCM_STATE_OPEN || - runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) + if (runtime->state == SNDRV_PCM_STATE_OPEN || + runtime->state == SNDRV_PCM_STATE_DISCONNECTED) return -EBADFD; if (!iter_is_iovec(from)) return -EINVAL; @@ -3595,7 +3596,7 @@ static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) return ok | EPOLLERR; runtime = substream->runtime; - if (runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) + if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED) return ok | EPOLLERR; poll_wait(file, &runtime->sleep, wait); @@ -3603,7 +3604,7 @@ static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) mask = 0; snd_pcm_stream_lock_irq(substream); avail = snd_pcm_avail(substream); - switch (runtime->status->state) { + switch (runtime->state) { case SNDRV_PCM_STATE_RUNNING: case SNDRV_PCM_STATE_PREPARED: case SNDRV_PCM_STATE_PAUSED: @@ -3874,7 +3875,7 @@ int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, return -EINVAL; } runtime = substream->runtime; - if (runtime->status->state == SNDRV_PCM_STATE_OPEN) + if (runtime->state == SNDRV_PCM_STATE_OPEN) return -EBADFD; if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) return -ENXIO; @@ -3911,7 +3912,7 @@ static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) substream = pcm_file->substream; if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; - if (substream->runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) + if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED) return -EBADFD; offset = area->vm_pgoff << PAGE_SHIFT; @@ -3949,7 +3950,7 @@ static int snd_pcm_fasync(int fd, struct file * file, int on) if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; runtime = substream->runtime; - if (runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) + if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED) return -EBADFD; return snd_fasync_helper(fd, file, on, &runtime->fasync); } |