pi433_write requires locking due to multiple kfifo 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
kfifo so kfifo_reset is not needed anymore.
pi433_tx_thread is the only kfifo reader
pi433_write requires locking due to multiple kfifo 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
kfifo so kfifo_reset is not needed anymore.
pi433_tx_thread is the only kfifo reader
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