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serial: stm32: fix transmit_chars when tx is stopped
[ Upstream commit b83b957c91f68e53f0dc596e129e8305761f2a32 ] Disables the tx irq when the transmission is ended and updates stop_tx conditions for code cleanup. Fixes: 48a6092 ("serial: stm32-usart: Add STM32 USART Driver") Signed-off-by: Erwan Le Ray <erwan.leray@st.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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