When calculating available space on PCM buffer, positions of hw_ptr and
appl_ptr are required. When applications map staus and control data
successfully, they can calculate the space with architecture's support
for cache coherency. When failed, they should execute ioctl(2) with
SNDRV_PCM_IOCTL_SYNC_PTR command to query these positions to kernel
space.
This commit uses an added helper function for this purpose. For this call,
no need to update appl_ptr and avail_min in kernel space.
Signed-off-by: Takashi Sakamoto <o-takashi@xxxxxxxxxxxxx>
---
src/pcm/pcm_hw.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/pcm/pcm_hw.c b/src/pcm/pcm_hw.c
index 59ba33b5..c6abf170 100644
--- a/src/pcm/pcm_hw.c
+++ b/src/pcm/pcm_hw.c
@@ -1066,7 +1066,7 @@ static snd_pcm_sframes_t snd_pcm_hw_avail_update(snd_pcm_t *pcm)
snd_pcm_hw_t *hw = pcm->private_data;
snd_pcm_uframes_t avail;
- sync_ptr(hw, 0);
+ query_state(hw);
avail = snd_pcm_mmap_avail(pcm);
switch (FAST_PCM_STATE(hw)) {
case SNDRV_PCM_STATE_RUNNING:
--
2.11.0
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