Am Mittwoch, 24. Mai 2006 07:35 schrieb Xu Nakajima:
> Hello,
> I had asked this question a few days ago in
> zd1211 mailing list and did not get an answer
> and I think maybe this question is more suitable
> to this forum. So please don't regard this as
> a cross posting.
>
> zd1211 is a USB wireless dongle which has
> a linux driver.
> see:
> http://zd1211.ath.cx
>
> I hope somebody can explain:
>
> If you look at zd_usb_enable_int() in zd_usb.c,
> the USB transfer_buffer is currently created by a call
> to kmalloc; Any
> idea what is the advantage of using a DMA buffer
1. The buffer is mapped only once, upon allocation, not every submission.
2. The RAM is in a range the device can address. There will be no bounce
buffer.
Regards
Oliver
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