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In commit613051dac4Author: Daniel Vetter <daniel.vetter@ffwll.ch> Date: Wed Dec 14 00:08:06 2016 +0100 drm: locking&new iterators for connector_list we've went to extreme lengths to make sure connector iterations works in any context, without introducing any additional locking context. This worked, except for a small fumble in the implementation: When we actually race with a concurrent connector unplug event, and our temporary connector reference turns out to be the final one, then everything breaks: We call the connector release function from whatever context we happen to be in, which can be an irq/atomic context. And connector freeing grabs all kinds of locks and stuff. Fix this by creating a specially safe put function for connetor_iter, which (in this rare case) punts the cleanup to a worker. Reported-by: Ben Widawsky <ben@bwidawsk.net> Cc: Ben Widawsky <ben@bwidawsk.net> Fixes:613051dac4("drm: locking&new iterators for connector_list") Cc: Dave Airlie <airlied@gmail.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Sean Paul <seanpaul@chromium.org> Cc: <stable@vger.kernel.org> # v4.11+ Reviewed-by: Dave Airlie <airlied@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171204204818.24745-1-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.