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authorJaroslav Kysela <perex@perex.cz>2010-01-26 17:08:24 +0100
committerJaroslav Kysela <perex@perex.cz>2010-01-26 17:50:50 +0100
commite7636925789b042ff9d98c51d48392e8c5549480 (patch)
tree4462f95057322b7d63d3b625644abd1f8fef6d7a /sound/core
parentfd0b092a7b14559e2ff17ef3aaefb5d8adc7e15f (diff)
downloadlinux-e7636925789b042ff9d98c51d48392e8c5549480.tar.bz2
ALSA: pcm_lib - return back hw_ptr_interrupt
Clemens Ladisch noted for hw_ptr_removal in "cleanup & merge hw_ptr update functions" commit: "It is possible for the status/delay ioctls to be called when the sound card's pointer register alreay shows a position at the beginning of the new period, but immediately before the interrupt is actually executed. (This happens regularly on a SMP machine with mplayer.) When that happens, the code thinks that the position must be at least one period ahead of the current position and drops an entire buffer of data." Return back the hw_ptr_interrupt variable. The last interrupt pointer is always computed from the latest hw_ptr instead of tracking it separately (in this case all hw_ptr checks and modifications might influence also hw_ptr_interrupt and it is difficult to keep it consistent). Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/oss/pcm_oss.c3
-rw-r--r--sound/core/pcm_lib.c7
-rw-r--r--sound/core/pcm_native.c2
3 files changed, 8 insertions, 4 deletions
diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index 255ad910077a..82d4e3329b3d 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -635,8 +635,7 @@ static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)
static inline
snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime)
{
- snd_pcm_uframes_t ptr = runtime->status->hw_ptr;
- return ptr - (ptr % runtime->period_size);
+ return runtime->hw_ptr_interrupt;
}
/* define extended formats in the recent OSS versions (if any) */
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index e2a817eac2a9..aa54195ef3b0 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -325,8 +325,7 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
if (in_interrupt) {
/* we know that one period was processed */
/* delta = "expected next hw_ptr" for in_interrupt != 0 */
- delta = old_hw_ptr - (old_hw_ptr % runtime->period_size)
- + runtime->period_size;
+ delta = runtime->hw_ptr_interrupt + runtime->period_size;
if (delta > new_hw_ptr) {
hw_base += runtime->buffer_size;
if (hw_base >= runtime->boundary)
@@ -437,6 +436,10 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
runtime->silence_size > 0)
snd_pcm_playback_silence(substream, new_hw_ptr);
+ if (in_interrupt) {
+ runtime->hw_ptr_interrupt = new_hw_ptr -
+ (new_hw_ptr % runtime->period_size);
+ }
runtime->hw_ptr_base = hw_base;
runtime->status->hw_ptr = new_hw_ptr;
runtime->hw_ptr_jiffies = jiffies;
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 56ec35e8510b..7a002db512b4 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1252,6 +1252,8 @@ static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
if (err < 0)
return err;
runtime->hw_ptr_base = 0;
+ runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
+ runtime->status->hw_ptr % runtime->period_size;
runtime->silence_start = runtime->status->hw_ptr;
runtime->silence_filled = 0;
return 0;