[PATCH 6.6 112/158] serial: stm32: Reset .throttled state in .startup()

Greg Kroah-Hartman
2024-04-23T21:43:52Z

From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

commit ea2624b5b829b8f93c0dce25721d835969b34faf upstream.

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: d1ec8a2eabe9 ("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>
---
drivers/tty/serial/stm32-usart.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -1077,6 +1077,7 @@ static int stm32_usart_startup(struct ua
val |= USART_CR2_SWAP;
writel_relaxed(val, port->membase + ofs->cr2);
}
+ stm32_port->throttled = false;

/* RX FIFO Flush */
if (ofs->rqr != UNDEF_REG)