ALSA: USB: adjust for changed 3.8 USB API

The recent changes in the USB API ("implement new semantics for
URB_ISO_ASAP") made the former meaning of the URB_ISO_ASAP flag the
default, and changed this flag to mean that URBs can be delayed.
This is not the behaviour wanted by any of the audio drivers because
it leads to discontinuous playback with very small period sizes.
Therefore, our URBs need to be submitted without this flag.

Reported-by: Joe Rayhawk <jrayhawk@fairlystable.org>
Cc: <stable@vger.kernel.org> # 3.8 only
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/6fire/pcm.c

@@ -575,7 +575,6 @@ static void usb6fire_pcm_init_urb(struct pcm_urb *urb,
 	urb->instance.pipe = in ? usb_rcvisocpipe(chip->dev, ep)
 			: usb_sndisocpipe(chip->dev, ep);
 	urb->instance.interval = 1;
-	urb->instance.transfer_flags = URB_ISO_ASAP;
 	urb->instance.complete = handler;
 	urb->instance.context = urb;
 	urb->instance.number_of_packets = PCM_N_PACKETS_PER_URB;

sound/usb/caiaq/audio.c

@@ -683,7 +683,6 @@ static void read_completed(struct urb *urb)
 
 	if (send_it) {
 		out->number_of_packets = outframe;
-		out->transfer_flags = URB_ISO_ASAP;
 		usb_submit_urb(out, GFP_ATOMIC);
 	} else {
 		struct snd_usb_caiaq_cb_info *oinfo = out->context;
@@ -699,7 +698,6 @@ static void read_completed(struct urb *urb)
 	}
 
 	urb->number_of_packets = FRAMES_PER_URB;
-	urb->transfer_flags = URB_ISO_ASAP;
 	usb_submit_urb(urb, GFP_ATOMIC);
 }
 
@@ -765,7 +763,6 @@ static struct urb **alloc_urbs(struct snd_usb_caiaqdev *cdev, int dir, int *ret)
 						* BYTES_PER_FRAME;
 		urbs[i]->context = &cdev->data_cb_info[i];
 		urbs[i]->interval = 1;
-		urbs[i]->transfer_flags = URB_ISO_ASAP;
 		urbs[i]->number_of_packets = FRAMES_PER_URB;
 		urbs[i]->complete = (dir == SNDRV_PCM_STREAM_CAPTURE) ?
 					read_completed : write_completed;

sound/usb/endpoint.c

@@ -684,7 +684,7 @@ static int data_ep_set_params(struct snd_usb_endpoint *ep,
 		if (!u->urb->transfer_buffer)
 			goto out_of_memory;
 		u->urb->pipe = ep->pipe;
-		u->urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
+		u->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 		u->urb->interval = 1 << ep->datainterval;
 		u->urb->context = u;
 		u->urb->complete = snd_complete_urb;
@@ -723,8 +723,7 @@ static int sync_ep_set_params(struct snd_usb_endpoint *ep,
 		u->urb->transfer_dma = ep->sync_dma + i * 4;
 		u->urb->transfer_buffer_length = 4;
 		u->urb->pipe = ep->pipe;
-		u->urb->transfer_flags = URB_ISO_ASAP |
-					 URB_NO_TRANSFER_DMA_MAP;
+		u->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 		u->urb->number_of_packets = 1;
 		u->urb->interval = 1 << ep->syncinterval;
 		u->urb->context = u;

sound/usb/misc/ua101.c

@@ -1120,8 +1120,7 @@ static int alloc_stream_urbs(struct ua101 *ua, struct ua101_stream *stream,
 			usb_init_urb(&urb->urb);
 			urb->urb.dev = ua->dev;
 			urb->urb.pipe = stream->usb_pipe;
-			urb->urb.transfer_flags = URB_ISO_ASAP |
-					URB_NO_TRANSFER_DMA_MAP;
+			urb->urb.transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 			urb->urb.transfer_buffer = addr;
 			urb->urb.transfer_dma = dma;
 			urb->urb.transfer_buffer_length = max_packet_size;

sound/usb/usx2y/usb_stream.c

@@ -69,7 +69,6 @@ static void init_pipe_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
 	     ++u, transfer += transfer_length) {
 		struct urb *urb = urbs[u];
 		struct usb_iso_packet_descriptor *desc;
-		urb->transfer_flags = URB_ISO_ASAP;
 		urb->transfer_buffer = transfer;
 		urb->dev = dev;
 		urb->pipe = pipe;

sound/usb/usx2y/usbusx2yaudio.c

@@ -503,7 +503,6 @@ static int usX2Y_urbs_start(struct snd_usX2Y_substream *subs)
 			if (0 == i)
 				atomic_set(&subs->state, state_STARTING3);
 			urb->dev = usX2Y->dev;
-			urb->transfer_flags = URB_ISO_ASAP;
 			for (pack = 0; pack < nr_of_packs(); pack++) {
 				urb->iso_frame_desc[pack].offset = subs->maxpacksize * pack;
 				urb->iso_frame_desc[pack].length = subs->maxpacksize;

sound/usb/usx2y/usx2yhwdeppcm.c

@@ -443,7 +443,6 @@ static int usX2Y_usbpcm_urbs_start(struct snd_usX2Y_substream *subs)
 					if (0 == u)
 						atomic_set(&subs->state, state_STARTING3);
 					urb->dev = usX2Y->dev;
-					urb->transfer_flags = URB_ISO_ASAP;
 					for (pack = 0; pack < nr_of_packs(); pack++) {
 						urb->iso_frame_desc[pack].offset = subs->maxpacksize * (pack + u * nr_of_packs());
 						urb->iso_frame_desc[pack].length = subs->maxpacksize;