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5451dab9b7
pi433_write requires locking due to multiple writers. After acquiring the lock check if enough free space is available in the kfifo to write the whole message. This check should prevent partial writes to tx_fifo so kfifo_reset is not needed anymore. pi433_tx_thread is the only reader so it does not require locking after kfifo_reset is removed. Signed-off-by: Valentin Vidic <Valentin.Vidic@CARNet.hr> Reviewed-by: Marcus Wolf <marcus.wolf@wolf-entwicklungen.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>