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-rw-r--r--sound/usb/usbaudio.c29
1 files changed, 5 insertions, 24 deletions
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index f3d4de23fedf..44485b29f675 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -1035,9 +1035,9 @@ static void release_substream_urbs(struct snd_usb_substream *subs, int force)
1035static int init_substream_urbs(struct snd_usb_substream *subs, unsigned int period_bytes, 1035static int init_substream_urbs(struct snd_usb_substream *subs, unsigned int period_bytes,
1036 unsigned int rate, unsigned int frame_bits) 1036 unsigned int rate, unsigned int frame_bits)
1037{ 1037{
1038 unsigned int maxsize, n, i; 1038 unsigned int maxsize, i;
1039 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK; 1039 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
1040 unsigned int npacks[MAX_URBS], urb_packs, total_packs, packs_per_ms; 1040 unsigned int urb_packs, total_packs, packs_per_ms;
1041 1041
1042 /* calculate the frequency in 16.16 format */ 1042 /* calculate the frequency in 16.16 format */
1043 if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL) 1043 if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
@@ -1109,31 +1109,11 @@ static int init_substream_urbs(struct snd_usb_substream *subs, unsigned int peri
1109 /* too much... */ 1109 /* too much... */
1110 subs->nurbs = MAX_URBS; 1110 subs->nurbs = MAX_URBS;
1111 total_packs = MAX_URBS * urb_packs; 1111 total_packs = MAX_URBS * urb_packs;
1112 } 1112 } else if (subs->nurbs < 2) {
1113 n = total_packs;
1114 for (i = 0; i < subs->nurbs; i++) {
1115 npacks[i] = n > urb_packs ? urb_packs : n;
1116 n -= urb_packs;
1117 }
1118 if (subs->nurbs <= 1) {
1119 /* too little - we need at least two packets 1113 /* too little - we need at least two packets
1120 * to ensure contiguous playback/capture 1114 * to ensure contiguous playback/capture
1121 */ 1115 */
1122 subs->nurbs = 2; 1116 subs->nurbs = 2;
1123 npacks[0] = (total_packs + 1) / 2;
1124 npacks[1] = total_packs - npacks[0];
1125 } else if (npacks[subs->nurbs-1] < MIN_PACKS_URB * packs_per_ms) {
1126 /* the last packet is too small.. */
1127 if (subs->nurbs > 2) {
1128 /* merge to the first one */
1129 npacks[0] += npacks[subs->nurbs - 1];
1130 subs->nurbs--;
1131 } else {
1132 /* divide to two */
1133 subs->nurbs = 2;
1134 npacks[0] = (total_packs + 1) / 2;
1135 npacks[1] = total_packs - npacks[0];
1136 }
1137 } 1117 }
1138 1118
1139 /* allocate and initialize data urbs */ 1119 /* allocate and initialize data urbs */
@@ -1141,7 +1121,8 @@ static int init_substream_urbs(struct snd_usb_substream *subs, unsigned int peri
1141 struct snd_urb_ctx *u = &subs->dataurb[i]; 1121 struct snd_urb_ctx *u = &subs->dataurb[i];
1142 u->index = i; 1122 u->index = i;
1143 u->subs = subs; 1123 u->subs = subs;
1144 u->packets = npacks[i]; 1124 u->packets = (i + 1) * total_packs / subs->nurbs
1125 - i * total_packs / subs->nurbs;
1145 u->buffer_size = maxsize * u->packets; 1126 u->buffer_size = maxsize * u->packets;
1146 if (subs->fmt_type == USB_FORMAT_TYPE_II) 1127 if (subs->fmt_type == USB_FORMAT_TYPE_II)
1147 u->packets++; /* for transfer delimiter */ 1128 u->packets++; /* for transfer delimiter */