From: Mauro Carvalho Chehab <m.chehab@xxxxxxxxxxx>
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.
This patch implements the same fix as found at snd-usb-audio driver
(commit c75c5ab575af7db707689cdbb5a5c458e9a034bb)
Signed-off-by: Mauro Carvalho Chehab <m.chehab@xxxxxxxxxxx>
---
drivers/media/usb/em28xx/em28xx-audio.c | 2 +-
drivers/media/usb/em28xx/em28xx-core.c | 3 +--
2 files changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/media/usb/em28xx/em28xx-audio.c b/drivers/media/usb/em28xx/em28xx-audio.c
index a6eef06ffdcd..54f4eb6d513c 100644
--- a/drivers/media/usb/em28xx/em28xx-audio.c
+++ b/drivers/media/usb/em28xx/em28xx-audio.c
@@ -195,7 +195,7 @@ static int em28xx_init_audio_isoc(struct em28xx *dev)
urb->dev = dev->udev;
urb->context = dev;
urb->pipe = usb_rcvisocpipe(dev->udev, EM28XX_EP_AUDIO);
- urb->transfer_flags = URB_ISO_ASAP;
+ urb->transfer_flags = 0;
urb->transfer_buffer = dev->adev.transfer_buffer[i];
urb->interval = 1;
urb->complete = em28xx_audio_isocirq;
diff --git a/drivers/media/usb/em28xx/em28xx-core.c b/drivers/media/usb/em28xx/em28xx-core.c
index d6928d83fb2a..8376b9e6397f 100644
--- a/drivers/media/usb/em28xx/em28xx-core.c
+++ b/drivers/media/usb/em28xx/em28xx-core.c
@@ -953,8 +953,7 @@ int em28xx_alloc_urbs(struct em28xx *dev, enum em28xx_mode mode, int xfer_bulk,
usb_fill_int_urb(urb, dev->udev, pipe,
usb_bufs->transfer_buffer[i], sb_size,
em28xx_irq_callback, dev, 1);
- urb->transfer_flags = URB_ISO_ASAP |
- URB_NO_TRANSFER_DMA_MAP;
+ urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
k = 0;
for (j = 0; j < usb_bufs->num_packets; j++) {
urb->iso_frame_desc[j].offset = k;
--
1.8.3.1
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