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[media] em28xx: use usb_alloc_coherent() for audio

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Instead of allocating transfer buffers with kmalloc() use
usb_alloc_coherent().

This patch should make it work also with ARM CPUs.

Reviewed-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Mauro Carvalho Chehab 2013-12-28 11:47:16 -03:00
parent dad4c41827
commit 46c704d77f
1 changed files with 20 additions and 11 deletions
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31
drivers/media/usb/em28xx/em28xx-audio.c
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@ -64,16 +64,22 @@ static int em28xx_deinit_isoc_audio(struct em28xx *dev)
dprintk("Stopping isoc\n");
for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
struct urb *urb = dev->adev.urb[i];
if (!irqs_disabled())
usb_kill_urb(dev->adev.urb[i]);
usb_kill_urb(urb);
else
usb_unlink_urb(dev->adev.urb[i]);
usb_unlink_urb(urb);
usb_free_urb(dev->adev.urb[i]);
dev->adev.urb[i] = NULL;
usb_free_coherent(dev->udev,
urb->transfer_buffer_length,
dev->adev.transfer_buffer[i],
urb->transfer_dma);
kfree(dev->adev.transfer_buffer[i]);
dev->adev.transfer_buffer[i] = NULL;
usb_free_urb(urb);
dev->adev.urb[i] = NULL;
}
return 0;
@ -176,12 +182,8 @@ static int em28xx_init_audio_isoc(struct em28xx *dev)
for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
struct urb *urb;
int j, k;
void *buf;
dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
if (!dev->adev.transfer_buffer[i])
return -ENOMEM;
memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
if (!urb) {
em28xx_errdev("usb_alloc_urb failed!\n");
@ -192,10 +194,17 @@ static int em28xx_init_audio_isoc(struct em28xx *dev)
return -ENOMEM;
}
buf = usb_alloc_coherent(dev->udev, sb_size, GFP_ATOMIC,
&urb->transfer_dma);
if (!buf)
return -ENOMEM;
dev->adev.transfer_buffer[i] = buf;
memset(buf, 0x80, sb_size);
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 = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
urb->transfer_buffer = dev->adev.transfer_buffer[i];
urb->interval = 1;
urb->complete = em28xx_audio_isocirq;