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Reduce acquisition of struct_mutex to the critical regions that must hold it; for KMS, we need struct_mutex currently only for the purpose of pinning/unpinning the framebuffer's VMA into the global GTT. This allows us to avoid taking the struct_mutex when disabling the CRTC (i.e. NULL framebuffer objects) before a reset. (Not yet achieving the full goal of avoiding the strut_mutex nesting, but good enough to break the first half of the reset deadlock.) v2: Keep pages pinning inside struct_mutex for the moment. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20170726160038.29487-1-chris@chris-wilson.co.uk [danvet: Drop another case of grabbing dev->struct_mutex around cleanup_planes, which popped up because I had to redo the drm-next backmerge for entirely different reasons. Acked by Chris on irc.] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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.