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-rw-r--r--sound/core/pcm_lib.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 92ed6d81922..063c675177a 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -221,8 +221,11 @@ static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
new_hw_ptr = hw_base + pos;
hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size;
delta = new_hw_ptr - hw_ptr_interrupt;
- if (hw_ptr_interrupt == runtime->boundary)
- hw_ptr_interrupt = 0;
+ if (hw_ptr_interrupt >= runtime->boundary) {
+ hw_ptr_interrupt %= runtime->boundary;
+ if (!hw_base) /* hw_base was already lapped; recalc delta */
+ delta = new_hw_ptr - hw_ptr_interrupt;
+ }
if (delta < 0) {
delta += runtime->buffer_size;
if (delta < 0) {
@@ -233,6 +236,8 @@ static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
(long)hw_ptr_interrupt);
/* rebase to interrupt position */
hw_base = new_hw_ptr = hw_ptr_interrupt;
+ /* align hw_base to buffer_size */
+ hw_base -= hw_base % runtime->buffer_size;
delta = 0;
} else {
hw_base += runtime->buffer_size;