Am Mittwoch, 10. August 2005 16:48 schrieb Alan Stern:
First thanks for your reply .
> The driver doesn't utilize this buffer as much as it could. It should set
> touchkit->irq->transfer_dma to touchkit->data_dma and
> touchkit->irq->transfer_flags to URB_NO_TRANSFER_DMA_MAP. However, even
> without setting those things the transfer should still work okay.
So i did the following :
touchkit->irq = usb_alloc_urb(0, GFP_KERNEL);
touchkit->data = usb_buffer_alloc(udev, TOUCHKIT_REPORT_DATA_SIZE,
SLAB_ATOMIC | URB_NO_TRANSFER_DMA_MAP,
&touchkit->irq->transfer_dma);
usb_fill_int_urb(touchkit->irq, touchkit->udev,
usb_rcvintpipe(touchkit->udev, 0x81),
touchkit->data, TOUCHKIT_REPORT_DATA_SIZE,
touchkit_irq, touchkit, endpoint->bInterval);
But it still dont work like it should. :-(
> That's not a static array, because it's part of the dynamically-allocated
> touchkit structure.
Ok you are right !
> I don't see how. In both cases you told the driver where to put the data.
> In one case the data ended up where you wanted, in the other case it
> didn't. It shouldn't matter how you got the data buffer in the first
> place -- unless dma_alloc_coherent for some reason returned memory that
> isn't accessible for DMA (which can't happen on x86).
Unfortunaterly i am not on ix86. So dma_alloc_coherent can fail !?
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