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serial: 8250: lock port for stop_rx() in omap8250_irq() 

[ Upstream commit ca73a892c5 ]

The uarts_ops stop_rx() callback expects that the port->lock is
taken and interrupts are disabled.

Fixes: 1fe0e1fa32 ("serial: 8250_omap: Handle optional overrun-throttle-ms property")
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20230525093159.223817-4-john.ogness@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
John Ogness 2023-05-25 11:37:54 +02:06 committed by Greg Kroah-Hartman
parent 44470207db
commit 65a7cfc009
1 changed files with 2 additions and 0 deletions
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2
drivers/tty/serial/8250/8250_omap.c
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@ -641,7 +641,9 @@ static irqreturn_t omap8250_irq(int irq, void *dev_id)
up->ier = port->serial_in(port, UART_IER); up->ier = port->serial_in(port, UART_IER);
if (up->ier & (UART_IER_RLSI | UART_IER_RDI)) { if (up->ier & (UART_IER_RLSI | UART_IER_RDI)) {
spin_lock(&port->lock);
port->ops->stop_rx(port); port->ops->stop_rx(port);
spin_unlock(&port->lock);
} else { } else {
/* Keep restarting the timer until /* Keep restarting the timer until
* the input overrun subsides. * the input overrun subsides.