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authorClemens Ladisch <clemens@ladisch.de>2013-04-27 12:10:32 +0200
committerTakashi Iwai <tiwai@suse.de>2013-04-29 10:57:35 +0200
commitc75c5ab575af7db707689cdbb5a5c458e9a034bb (patch)
tree66bf7a427bcb7a46de41f58efdaa3be853b42e6f /sound/usb/endpoint.c
parentALSA: usb - Avoid unnecessary sample rate changes on USB 2.0 clock sources (diff)
downloadlinux-c75c5ab575af7db707689cdbb5a5c458e9a034bb.tar.xz
linux-c75c5ab575af7db707689cdbb5a5c458e9a034bb.zip
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>
Diffstat (limited to 'sound/usb/endpoint.c')
-rw-r--r--sound/usb/endpoint.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 32d0b41a1ff6..7a444b5501d9 100644
--- a/sound/usb/endpoint.c
+++ b/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;