0f92f56bab
but it's better than the buggy behavior we have now. If we contigmalloc() buffers in bus_dmamem_alloc(), then we must configfree() them in bus_dmamem_free(). Trying to free() them is wrong, and will cause a panic (at least, it does on the alpha.) I tripped over this when trying to kldunload my busdma-ified if_rl driver.