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i2c_davinci_cpufreq_transition() is implemented in a way that will block if it ever gets called while no transfer is in progress. Not only that, but reinit_completion() is never called for xfr_complete. Use the fact that cpufreq uses an srcu_notifier (running in process context) for transitions and that the bus_lock is taken during the call to master_xfer() and simplify the code by removing the transfer completion entirely and protecting i2c_davinci_cpufreq_transition() with i2c_lock/unlock_adapter(). Reported-by: David Lechner <david@lechnology.com> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Reviewed-by: Sekhar Nori <nsekhar@ti.com> Tested-by: David Lechner <david@lechnology.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>