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While coherent memory is cheap on x86, it may cause performance impacts on other archs. As we don't have any good reason to use it, let's change the logic by allocating memory via kmalloc() and letting the USB core to do the DMA mapping and memory free for us. While here, also fixes an issue that it was not de-allocating memories if something gets wrong during memory block allocation. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.