Re: invalid address for sound DMA-buffer

Alan Cox (alan@lxorguk.ukuu.org.uk)
Wed, 20 Oct 1999 15:09:12 +0100 (BST)


> with kernel 2.3.23-4 the sound driver (sb for ESS1868) keeps
> saying:
>
> sound: Got invalid address 0xc3410000 for 65536b DMA-buffer
> sound: Got invalid address 0xc33f0000 for 65536b DMA-buffer
> sound: Got invalid address 0xc33d0000 for 65536b DMA-buffer

This indicates someone has broken the memory allocator and it is passing non
ISA DMA memory to the sound driver. The driver takes great pain to catch this
because a broken ISA DMA allocator in the kernel is likely to cause
memory and potentially disk corruption with some old ISA controllers.

I'll take a look. This could easily be that the bigmem code has broken the
ISA DMA tests many drivers use rather than the memory allocator handing back
wrong pages.

Alan

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