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When DT overlays are applied, each FPGA region keeps track of the fpga image info as region->info. This pointer is assigned only if an overlay causes the FPGA to be programmed. As it stands, this pointer can be overwritten, causing a slow warning later when overlays are removed. This patch fixes this by changing the allowed behaviour. If a region has received an overlay that programmed the FPGA, reject other overlays that try to program the FPGA. To reprogram the FPGA, first remove the overlay. This makes sense as removing the overlay also removes the devices cleanly. Note that overlays that make DT changes without reprogramming the FPGA are exempt from this restriction. Signed-off-by: Alan Tull <atull@kernel.org> Acked-by: Moritz Fischer <mdf@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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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.