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The legacy context switch for ringbuffer submission is multistaged, where each of those stages may fail. However, we were updating global state after some stages, and so we had to force the incomplete request to be submitted because we could not unwind. Save the global state before performing the switches, and so enable us to unwind back to the previous global state should any phase fail. We then must cancel the request instead of submitting it should the construction fail. v2: s/saved_ctx/from_ctx/; s/ctx/to_ctx/ etc. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171123152631.31385-1-chris@chris-wilson.co.uk
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.