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serial: stm32: call stm32_transmit_chars locked

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[ Upstream commit f16b90c2d9 ]

stm32_transmit_chars should be called under lock also in tx DMA callback.

Fixes: 3489187204 ("serial: stm32: adding dma support")
Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com>
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/20210304162308.8984-10-erwan.leray@foss.st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Erwan Le Ray 2021-03-04 17:23:04 +01:00 • committed by Greg Kroah-Hartman
commit f765918b33
1 changed files with 3 additions and 0 deletions
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3
drivers/tty/serial/stm32-usart.c
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@ -290,13 +290,16 @@ static void stm32_usart_tx_dma_complete(void *arg)
struct uart_port *port = arg;
struct stm32_port *stm32port = to_stm32_port(port);
const struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
unsigned long flags;
dmaengine_terminate_async(stm32port->tx_ch);
stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
stm32port->tx_dma_busy = false;
/* Let's see if we have pending data to send */
spin_lock_irqsave(&port->lock, flags);
stm32_usart_transmit_chars(port);
spin_unlock_irqrestore(&port->lock, flags);
}
static void stm32_usart_tx_interrupt_enable(struct uart_port *port)