RE: mmap/munmap on linux-2.6.11

[Aleksey Gorelov]

 >-----Original Message-----
>From: linux-kernel-owner@xxxxxxxxxxxxxxx 
>[mailto:linux-kernel-owner@xxxxxxxxxxxxxxx] On Behalf Of linux-os
>Sent: Friday, March 25, 2005 1:19 PM
>To: Linux kernel
>Subject: mmap/munmap on linux-2.6.11
>
>Memory gurus,
>
>We have an application where a driver allocates DMA-able memory.
>This DMA-able memory is mmap()ed to user-space. To conserve
>DMA memory only single pages are obtained using
>  __get_dma_pages(GFP_KERNEL, 1) (one page at a time). These
>pages, that may be scattered all about, are mmap()ed into contiguous
>user data-space. The DMA engine uses a scatter-list so we can
>write DMA pages anywhere. They don't have to be contiguous.
>
>Here's a catch. It would be nice to release those DMA pages
>when we don't need them. However, there doesn't appear to
>be any way for driver code to know when munmap() has been
>called and those DMA pages are available to be released.
>
>How do I know that munmap() has been called? It turns out
>that if I release those pages before unmapping the user-mode,
>the system will crash. Therefore this could be a DOS attack
>if my driver ever allowed the DMA pages to be released.

munmap() should do the job for you and release those automatically.

Aleks.
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