1 files changed, 26 insertions, 19 deletions

diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index 56e42b88add..8fd37596e3a 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -186,6 +186,7 @@ struct snd_usb_substream {
 	u64 formats;			/* format bitmasks (all or'ed) */
 	unsigned int num_formats;		/* number of supported audio formats (list) */
 	struct list_head fmt_list;	/* format list */
+	struct snd_pcm_hw_constraint_list rate_list;	/* limited rates */
 	spinlock_t lock;
 
 	struct snd_urb_ops ops;		/* callbacks (must be filled at init) */
@@ -1818,28 +1819,33 @@ static int check_hw_params_convention(struct snd_usb_substream *subs)
 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 				  struct snd_usb_substream *subs)
 {
-	struct list_head *p;
-	struct snd_pcm_hw_constraint_list constraints_rates;
+	struct audioformat *fp;
+	int count = 0, needs_knot = 0;
 	int err;
 
-	list_for_each(p, &subs->fmt_list) {
-		struct audioformat *fp;
-		fp = list_entry(p, struct audioformat, list);
-
-		if (!fp->needs_knot)
-			continue;
-
-		constraints_rates.count = fp->nr_rates;
-		constraints_rates.list = fp->rate_table;
-		constraints_rates.mask = 0;
-
-		err = snd_pcm_hw_constraint_list(runtime, 0,
-			SNDRV_PCM_HW_PARAM_RATE,
-			&constraints_rates);
-
-		if (err < 0)
-			return err;
+	list_for_each_entry(fp, &subs->fmt_list, list) {
+		if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
+			return 0;
+		count += fp->nr_rates;
+		if (fp->needs_knot)
+			needs_knot = 1;
 	}
+	if (!needs_knot)
+		return 0;
+
+	subs->rate_list.count = count;
+	subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
+	subs->rate_list.mask = 0;
+	count = 0;
+	list_for_each_entry(fp, &subs->fmt_list, list) {
+		int i;
+		for (i = 0; i < fp->nr_rates; i++)
+			subs->rate_list.list[count++] = fp->rate_table[i];
+	}
+	err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+					 &subs->rate_list);
+	if (err < 0)
+		return err;
 
 	return 0;
 }
@@ -2238,6 +2244,7 @@ static void free_substream(struct snd_usb_substream *subs)
 		kfree(fp->rate_table);
 		kfree(fp);
 	}
+	kfree(subs->rate_list.list);
 }