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DMA crossbar uses 'xbar->dma_inuse' variable to manage allocated routes. Each bit represents respective DMA channel. If the channel is free, bit is set to '0', if channel is allocated, bit should be set to '1'. In reserve function, the bits for requested DMA channels are cleared, so they are not really reserved, but freed and become ready for allocation. Signed-off-by: Alexander Smirnov <asmirnov@ilbers.de> Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Vinod Koul <vinod.koul@intel.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.