3 files changed, 76 insertions, 7 deletions

diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 5417f7dce834..720019560794 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -763,10 +763,13 @@ int snd_interval_ratnum(struct snd_interval *i,
 			unsigned int rats_count, struct snd_ratnum *rats,
 			unsigned int *nump, unsigned int *denp)
 {
-	unsigned int best_num, best_diff, best_den;
+	unsigned int best_num, best_den;
+	int best_diff;
 	unsigned int k;
 	struct snd_interval t;
 	int err;
+	unsigned int result_num, result_den;
+	int result_diff;
 
 	best_num = best_den = best_diff = 0;
 	for (k = 0; k < rats_count; ++k) {
@@ -788,6 +791,8 @@ int snd_interval_ratnum(struct snd_interval *i,
 				den -= r;
 		}
 		diff = num - q * den;
+		if (diff < 0)
+			diff = -diff;
 		if (best_num == 0 ||
 		    diff * best_den < best_diff * den) {
 			best_diff = diff;
@@ -802,6 +807,9 @@ int snd_interval_ratnum(struct snd_interval *i,
 	t.min = div_down(best_num, best_den);
 	t.openmin = !!(best_num % best_den);
 	
+	result_num = best_num;
+	result_diff = best_diff;
+	result_den = best_den;
 	best_num = best_den = best_diff = 0;
 	for (k = 0; k < rats_count; ++k) {
 		unsigned int num = rats[k].num;
@@ -824,6 +832,8 @@ int snd_interval_ratnum(struct snd_interval *i,
 				den += rats[k].den_step - r;
 		}
 		diff = q * den - num;
+		if (diff < 0)
+			diff = -diff;
 		if (best_num == 0 ||
 		    diff * best_den < best_diff * den) {
 			best_diff = diff;
@@ -843,10 +853,14 @@ int snd_interval_ratnum(struct snd_interval *i,
 		return err;
 
 	if (snd_interval_single(i)) {
+		if (best_diff * result_den < result_diff * best_den) {
+			result_num = best_num;
+			result_den = best_den;
+		}
 		if (nump)
-			*nump = best_num;
+			*nump = result_num;
 		if (denp)
-			*denp = best_den;
+			*denp = result_den;
 	}
 	return err;
 }
diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c
index caa7796bc2f5..d6d49d6651f9 100644
--- a/sound/core/pcm_memory.c
+++ b/sound/core/pcm_memory.c
@@ -23,6 +23,7 @@
 #include <linux/time.h>
 #include <linux/init.h>
 #include <linux/moduleparam.h>
+#include <linux/vmalloc.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/info.h>
@@ -434,3 +435,57 @@ int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream)
 }
 
 EXPORT_SYMBOL(snd_pcm_lib_free_pages);
+
+int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
+				      size_t size, gfp_t gfp_flags)
+{
+	struct snd_pcm_runtime *runtime;
+
+	if (PCM_RUNTIME_CHECK(substream))
+		return -EINVAL;
+	runtime = substream->runtime;
+	if (runtime->dma_area) {
+		if (runtime->dma_bytes >= size)
+			return 0; /* already large enough */
+		vfree(runtime->dma_area);
+	}
+	runtime->dma_area = __vmalloc(size, gfp_flags, PAGE_KERNEL);
+	if (!runtime->dma_area)
+		return -ENOMEM;
+	runtime->dma_bytes = size;
+	return 1;
+}
+EXPORT_SYMBOL(_snd_pcm_lib_alloc_vmalloc_buffer);
+
+/**
+ * snd_pcm_lib_free_vmalloc_buffer - free vmalloc buffer
+ * @substream: the substream with a buffer allocated by
+ *	snd_pcm_lib_alloc_vmalloc_buffer()
+ */
+int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime;
+
+	if (PCM_RUNTIME_CHECK(substream))
+		return -EINVAL;
+	runtime = substream->runtime;
+	vfree(runtime->dma_area);
+	runtime->dma_area = NULL;
+	return 0;
+}
+EXPORT_SYMBOL(snd_pcm_lib_free_vmalloc_buffer);
+
+/**
+ * snd_pcm_lib_get_vmalloc_page - map vmalloc buffer offset to page struct
+ * @substream: the substream with a buffer allocated by
+ *	snd_pcm_lib_alloc_vmalloc_buffer()
+ * @offset: offset in the buffer
+ *
+ * This function is to be used as the page callback in the PCM ops.
+ */
+struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
+					  unsigned long offset)
+{
+	return vmalloc_to_page(substream->runtime->dma_area + offset);
+}
+EXPORT_SYMBOL(snd_pcm_lib_get_vmalloc_page);
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 27284f628361..a870fe696578 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1918,13 +1918,13 @@ int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
 
 	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
 					   hw->rate_min, hw->rate_max);
-	 if (err < 0)
-		 return err;
+	if (err < 0)
+		return err;
 
 	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 					   hw->period_bytes_min, hw->period_bytes_max);
-	 if (err < 0)
-		 return err;
+	if (err < 0)
+		return err;
 
 	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
 					   hw->periods_min, hw->periods_max);