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spi_transaction() can be called from motionsense, hooks, hostcmd, console, and chipset tasks, so add a mutex to ensure an in-process transaction isn't preempted by another transaction. BUG=chrome-os-partner:57912 BRANCH=gru TEST=On kevin, run "while true; do ectool motionsense odr 0 0; sleep 1; ectool motionsense odr 0 1000000; sleep 1; done", verify watchdog crash not encountered after 20 minutes. Change-Id: I7ec495bab295dc03ce02372c20e5c7c5c196715d Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/391892 Reviewed-by: Aseda Aboagye <aaboagye@chromium.org> (cherry picked from commit eabdea443775fab834aaabbb7afae871306c7530) Reviewed-on: https://chromium-review.googlesource.com/392226 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Shawn N <shawnn@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly