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f39f87e9ea
The last parameter of `__get_free_pages()` is log2 (the 'order') of the number of pages to be allocated. This driver seems to think it is the linear number of pages, so `pci9118_alloc_dma()` first tries to allocate 16 pages, but only uses 4 of them, setting the buffer size to PAGE_SIZE multiplied by the 'order'. If the allocation fails, it tries progressively smaller orders, down to 0. If the allocation at order 0 succeeds, the buffer size is set to 0, which is likely to cause problems. Set the buffer size to `PAGE_SIZE` shifted left by the allocation order. Since the maximum buffer size previously used was 4, start with an allocation order of 2 instead of 4. Rename the `pages` member of `struct pci9118_dmabuf` (and the local variable in `pci9118_alloc_dma()`) to `order` to make it clearer what it is. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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