[ALSA] Remove PCM xfer_align sw params

The xfer_align sw_params parameter has never been used in a sane manner,
and no one understands what this does exactly.  The current
implementation looks also buggy because it allows write of shorter size
than xfer_align.  So, if you do partial writes, the write isn't actually
aligned at all.
Removing this parameter will make some pcm_lib_* code more readable
(and less buggy).

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

2 files changed, 1 insertions, 2 deletions

diff --git a/include/sound/asound.h b/include/sound/asound.h
index ee753d782e2d..069d9120e622 100644
--- a/include/sound/asound.h
+++ b/include/sound/asound.h
@@ -363,7 +363,7 @@ struct snd_pcm_sw_params {
         unsigned int period_step;
         unsigned int sleep_min;                 /* min ticks to sleep */
         snd_pcm_uframes_t avail_min;            /* min avail frames for wakeup */
-        snd_pcm_uframes_t xfer_align;           /* xfer size need to be a multiple */
+        snd_pcm_uframes_t xfer_align;           /* obsolete: xfer size need to be a multiple */
         snd_pcm_uframes_t start_threshold;      /* min hw_avail frames for automatic start */
         snd_pcm_uframes_t stop_threshold;       /* min avail frames for automatic stop */
         snd_pcm_uframes_t silence_threshold;    /* min distance from noise for silence filling */
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 65f636223d39..1270cbce776a 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -287,7 +287,6 @@ struct snd_pcm_runtime {
         int tstamp_mode;                /* mmap timestamp is updated */
         unsigned int period_step;
         unsigned int sleep_min;         /* min ticks to sleep */
-        snd_pcm_uframes_t xfer_align;   /* xfer size need to be a multiple */
         snd_pcm_uframes_t start_threshold;
         snd_pcm_uframes_t stop_threshold;
         snd_pcm_uframes_t silence_threshold; /* Silence filling happens when