media: videobuf-dma-contig: use dma_mmap_coherent
dma_alloc_coherent does not return a physical address, but a DMA address, which might be remapped or have an offset. Passing the DMA address to vm_iomap_memory is thus broken. Use the proper dma_mmap_coherent helper instead, and stop passing __GFP_COMP to dma_alloc_coherent, as the memory management inside the DMA allocator is hidden from the callers and does not require it. With this the gfp_t argument to __videobuf_dc_alloc can be removed and hard coded to GFP_KERNEL. Fixes: a8f3c203 ("[media] videobuf-dma-contig: add cache support") Signed-off-by: Christoph Hellwig <hch@lst.de>
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