ALSA: pcm: fix the fix of the runtime->boundary calculation

Commit 7910b4a1db63fefc3d291853d33c34c5b6352e8e in 2.6.34 changed the
runtime->boundary calculation to make this value a multiple of both the
buffer_size and the period_size, because the latter is assumed by the
runtime->hw_ptr_interrupt calculation.

However, due to the lack of a ioctl that could read the software
parameters before they are set, the kernel requires that alsa-lib
calculates the boundary value, too.  The changed algorithm leads to
a different boundary value used by alsa-lib, which makes, e.g., mplayer
fail to play a 44.1 kHz file because the silence_size parameter is now
invalid; bug report:
<https://bugtrack.alsa-project.org/alsa-bug/view.php?id=5015>.

This patch reverts the change to the boundary calculation, and instead
fixes the hw_ptr_interrupt calculation to be period-aligned regardless
of the boundary value.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

2 files changed, 10 insertions, 38 deletions

diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index a2ff86189d2..22aff180dd1 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -439,8 +439,13 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
                 snd_pcm_playback_silence(substream, new_hw_ptr);
 
         if (in_interrupt) {
-                runtime->hw_ptr_interrupt = new_hw_ptr -
-                                (new_hw_ptr % runtime->period_size);
+                delta = new_hw_ptr - runtime->hw_ptr_interrupt;
+                if (delta < 0)
+                        delta += runtime->boundary;
+                delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
+                runtime->hw_ptr_interrupt += delta;
+                if (runtime->hw_ptr_interrupt >= runtime->boundary)
+                        runtime->hw_ptr_interrupt -= runtime->boundary;
         }
         runtime->hw_ptr_base = hw_base;
         runtime->status->hw_ptr = new_hw_ptr;
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 644c2bb17b8..303ac04ff6e 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -27,7 +27,6 @@
 #include <linux/pm_qos_params.h>
 #include <linux/uio.h>
 #include <linux/dma-mapping.h>
-#include <linux/math64.h>
 #include <sound/core.h>
 #include <sound/control.h>
 #include <sound/info.h>
@@ -370,38 +369,6 @@ static int period_to_usecs(struct snd_pcm_runtime *runtime)
         return usecs;
 }
 
-static int calc_boundary(struct snd_pcm_runtime *runtime)
-{
-        u_int64_t boundary;
-
-        boundary = (u_int64_t)runtime->buffer_size *
-                   (u_int64_t)runtime->period_size;
-#if BITS_PER_LONG < 64
-        /* try to find lowest common multiple for buffer and period */
-        if (boundary > LONG_MAX - runtime->buffer_size) {
-                u_int32_t remainder = -1;
-                u_int32_t divident = runtime->buffer_size;
-                u_int32_t divisor = runtime->period_size;
-                while (remainder) {
-                        remainder = divident % divisor;
-                        if (remainder) {
-                                divident = divisor;
-                                divisor = remainder;
-                        }
-                }
-                boundary = div_u64(boundary, divisor);
-                if (boundary > LONG_MAX - runtime->buffer_size)
-                        return -ERANGE;
-        }
-#endif
-        if (boundary == 0)
-                return -ERANGE;
-        runtime->boundary = boundary;
-        while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
-                runtime->boundary *= 2;
-        return 0;
-}
-
 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
                              struct snd_pcm_hw_params *params)
 {
@@ -477,9 +444,9 @@ static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
         runtime->stop_threshold = runtime->buffer_size;
         runtime->silence_threshold = 0;
         runtime->silence_size = 0;
-        err = calc_boundary(runtime);
-        if (err < 0)
-                goto _error;
+        runtime->boundary = runtime->buffer_size;
+        while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
+                runtime->boundary *= 2;
 
         snd_pcm_timer_resolution_change(substream);
         runtime->status->state = SNDRV_PCM_STATE_SETUP;