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[ALSA] usb-audio - avoid unnecessary double buffering 

USB generic driver
When a USB packet boundary falls exactly on a buffer boundary, hwptr
remains at the end of the buffer which causes an overflow in the next
iteration and triggers double buffering although the next packet would
actually be contiguous.

This patch ensures that hwptr is always smaller than buffer_size.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
hifive-unleashed-5.1
Clemens Ladisch 2005-05-13 07:50:28 +02:00 committed by Jaroslav Kysela
parent 50cdbf1519
commit 29b16931f9
1 changed files with 2 additions and 0 deletions
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2
sound/usb/usbaudio.c
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@ -565,6 +565,8 @@ static int prepare_playback_urb(snd_usb_substream_t *subs,
/* set the buffer pointer */
urb->transfer_buffer = runtime->dma_area + subs->hwptr * stride;
subs->hwptr += offs;
if (subs->hwptr == runtime->buffer_size)
subs->hwptr = 0;
}
spin_unlock_irqrestore(&subs->lock, flags);
urb->transfer_buffer_length = offs * stride;