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serial: stm32: prevent TDR register overwrite when sending x_char

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[ Upstream commit d3d079bde07e1b7deaeb57506dc0b86010121d17 ]

When sending x_char in stm32_usart_transmit_chars(), driver can overwrite
the value of TDR register by the value of x_char. If this happens, the
previous value that was present in TDR register will not be sent through
uart.

This code checks if the previous value in TDR register is sent before
writing the x_char value into register.

Fixes: 48a6092fb4 ("serial: stm32-usart: Add STM32 USART Driver")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Valentin Caron <valentin.caron@foss.st.com>
Link: https://lore.kernel.org/r/20220111164441.6178-2-valentin.caron@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:
Valentin Caron 2022-01-11 17:44:40 +01:00 committed by Greg Kroah-Hartman
parent c999c5927e
commit 335f11ff74
1 changed files with 12 additions and 0 deletions
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12
drivers/tty/serial/stm32-usart.c
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@ -420,10 +420,22 @@ static void stm32_usart_transmit_chars(struct uart_port *port)
struct stm32_port *stm32_port = to_stm32_port(port);
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
struct circ_buf *xmit = &port->state->xmit;
u32 isr;
int ret;
if (port->x_char) {
if (stm32_port->tx_dma_busy)
stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
/* Check that TDR is empty before filling FIFO */
ret =
readl_relaxed_poll_timeout_atomic(port->membase + ofs->isr,
isr,
(isr & USART_SR_TXE),
10, 1000);
if (ret)
dev_warn(port->dev, "1 character may be erased\n");
writel_relaxed(port->x_char, port->membase + ofs->tdr);
port->x_char = 0;
port->icount.tx++;