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ALSA: USB: adjust for changed 3.8 USB API

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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>
This commit is contained in:
Clemens Ladisch
2013-04-27 12:10:32 +02:00
committed by Takashi Iwai
parent fa92dd77ec
commit c75c5ab575
7 changed files with 3 additions and 12 deletions
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3
sound/usb/misc/ua101.c
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@@ -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;