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6b07b6d2bd
Replace the handcrafter loop when checking for fifo slots with atomic wait for. This brings this wait in line with the other waits on register access. We also get a readable timeout constraint, so make it to fail after 10ms. Chris suggested that we should fail silently as the fifo debug handler, now attached to unclaimed mmio handling, will take care of the possible errors at later stage. Note that the decision to wait was changed so that we avoid allocating the first reserved entry. Nor do we reduce the count if we fail the wait, removing the possiblity to wrap the count if the hw fifo returned zero. v2: remove unclaimed check on timeout (Chris) v3: use void return (Chris) References: https://bugs.freedesktop.org/show_bug.cgi?id=100247 Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/1491493182-31540-1-git-send-email-mika.kuoppala@intel.com |
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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.