Hi, On Tue, Jan 10, 2012 at 6:20 PM, Marek Szyprowski <m.szyprow...@samsung.com> wrote:
>> Sorry, could you describe the abuse problem in a bit detail? > > Videobuf2 requires memory module handlers to provide vaddr method to provide > a pointer in > kernel virtual address space to video data (buffer content). It is used for > example by Yes, this is what the patch is doing, __get_free_pages just returns the kernel virtual address which will be passed to driver. > read()/write() io method emulator. Memory allocator/handler should not be > specific to any > particular use case in the device driver. That's the design. Simple. Most of the patch is copied from videobuf-vmalloc.c, and the interfaces are totally same with videobuf-vmalloc.c. > > I your case you want to give pointer to struct page from the memory allocator > to the In my case, the pointer to struct page is not required to the driver at all, so I think you have misunderstood the patch, don't I? > driver. The cookie method has been introduced exactly for this purpose. > Memory allocator > also provides a simple inline function to convert generic 'void *' return > type from cookie > method to allocator specific structure/pointer. > vb2_dma_contig_plane_dma_addr() and > vb2_dma_sg_plane_desc() were examples how does passing allocator specific > type though the > cookie method works. thanks, -- Ming Lei -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
