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Problem : While running IGT kms_atomic_transition test suite i encountered a hang in drmHandleEvent immediately following an atomic_commit. After dumping the atomic state I relized that in this case there was not even one CRTC attached to the state and only disabled planes. This probably due to a commit which hadn't changed any property which would require attaching crtc state. This means drmHandleEvent will never wake up from read since without CRTC in atomic state the event fd will not be signaled. Fix: Protect against this issue by failing atomic_commit early in drm_mode_atomic_commit where such probelm can be identified. v2: Fix typos and extra newlines. Change-Id: I3ee28ffae35fd1e8bfe553146c44da53da02e6f8 Signed-off-by: Andrey Grodzovsky <Andrey.Grodzovsky@amd.com> Reviewed-by: Harry Wentland <harry.wentland@amd.com> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1497981426-27203-1-git-send-email-Andrey.Grodzovsky@amd.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.