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authorCharles Keepax <ckeepax@opensource.wolfsonmicro.com>2013-04-18 14:03:46 +0400
committerTakashi Iwai <tiwai@suse.de>2013-04-21 11:54:11 +0400
commitf0283b58d01d36910fcd195d1fc365a3356b2be0 (patch)
tree77e12a473efd6837bdaa239ec81d2be85ff2afd2 /sound/core
parentccf17b13ca615a044c980f1e9a94a07b3f99926d (diff)
downloadlinux-f0283b58d01d36910fcd195d1fc365a3356b2be0.tar.xz
ALSA: compress_core: Rework writes to use cumulative values
This patch reworks the writes to use cumulative values thus making the app_pointer unecessary and removing it. Only tested as far as build. Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com> Acked-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/compress_offload.c18
1 files changed, 11 insertions, 7 deletions
diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c
index 36d7688fe69a..7941ace78283 100644
--- a/sound/core/compress_offload.c
+++ b/sound/core/compress_offload.c
@@ -28,11 +28,13 @@
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/list.h>
+#include <linux/math64.h>
#include <linux/mm.h>
#include <linux/mutex.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/sched.h>
+#include <linux/types.h>
#include <linux/uio.h>
#include <linux/uaccess.h>
#include <linux/module.h>
@@ -223,21 +225,24 @@ static int snd_compr_write_data(struct snd_compr_stream *stream,
void *dstn;
size_t copy;
struct snd_compr_runtime *runtime = stream->runtime;
+ /* 64-bit Modulus */
+ u64 app_pointer = div64_u64(runtime->total_bytes_available,
+ runtime->buffer_size);
+ app_pointer = runtime->total_bytes_available -
+ (app_pointer * runtime->buffer_size);
- dstn = runtime->buffer + runtime->app_pointer;
+ dstn = runtime->buffer + app_pointer;
pr_debug("copying %ld at %lld\n",
- (unsigned long)count, runtime->app_pointer);
- if (count < runtime->buffer_size - runtime->app_pointer) {
+ (unsigned long)count, app_pointer);
+ if (count < runtime->buffer_size - app_pointer) {
if (copy_from_user(dstn, buf, count))
return -EFAULT;
- runtime->app_pointer += count;
} else {
- copy = runtime->buffer_size - runtime->app_pointer;
+ copy = runtime->buffer_size - app_pointer;
if (copy_from_user(dstn, buf, copy))
return -EFAULT;
if (copy_from_user(runtime->buffer, buf + copy, count - copy))
return -EFAULT;
- runtime->app_pointer = count - copy;
}
/* if DSP cares, let it know data has been written */
if (stream->ops->ack)
@@ -656,7 +661,6 @@ static int snd_compr_stop(struct snd_compr_stream *stream)
if (!retval) {
stream->runtime->state = SNDRV_PCM_STATE_SETUP;
wake_up(&stream->runtime->sleep);
- stream->runtime->app_pointer = 0;
stream->runtime->total_bytes_available = 0;
stream->runtime->total_bytes_transferred = 0;
}