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serial: stm32: Reset .throttled state in .startup() 

When an UART is opened that still has .throttled set from a previous
open, the RX interrupt is enabled but the irq handler doesn't consider
it. This easily results in a stuck irq with the effect to occupy the CPU
in a tight loop.

So reset the throttle state in .startup() to ensure that RX irqs are
handled.

Fixes: d1ec8a2eab ("serial: stm32: update throttle and unthrottle ops for dma mode")
Cc: stable@vger.kernel.org
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/a784f80d3414f7db723b2ec66efc56e1ad666cbf.1713344161.git.u.kleine-koenig@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Uwe Kleine-König 2024-04-17 11:03:28 +02:00 committed by Greg Kroah-Hartman
parent 13c785323b
commit ea2624b5b8
1 changed files with 1 additions and 0 deletions
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drivers/tty/serial/stm32-usart.c
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@ -1092,6 +1092,7 @@ static int stm32_usart_startup(struct uart_port *port)
val |= USART_CR2_SWAP; val |= USART_CR2_SWAP;
writel_relaxed(val, port->membase + ofs->cr2); writel_relaxed(val, port->membase + ofs->cr2);
} }
stm32_port->throttled = false;
/* RX FIFO Flush */ /* RX FIFO Flush */
if (ofs->rqr != UNDEF_REG) if (ofs->rqr != UNDEF_REG)