Patch "serial: 8250: lock port for stop_rx() in omap8250_irq()" has been added to the 5.10-stable tree

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This is a note to let you know that I've just added the patch titled

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

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     serial-8250-lock-port-for-stop_rx-in-omap8250_irq.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit e04546ffa851be423fd130d38c68ef1fb1b77508
Author: John Ogness <john.ogness@xxxxxxxxxxxxx>
Date:   Thu May 25 11:37:54 2023 +0206

    serial: 8250: lock port for stop_rx() in omap8250_irq()
    
    [ Upstream commit ca73a892c5bec4b08a2fa22b3015e98ed905abb7 ]
    
    The uarts_ops stop_rx() callback expects that the port->lock is
    taken and interrupts are disabled.
    
    Fixes: 1fe0e1fa3209 ("serial: 8250_omap: Handle optional overrun-throttle-ms property")
    Signed-off-by: John Ogness <john.ogness@xxxxxxxxxxxxx>
    Reviewed-by: Tony Lindgren <tony@xxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20230525093159.223817-4-john.ogness@xxxxxxxxxxxxx
    Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 6b255e1633fd4..6043d4fa08cc2 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -655,7 +655,9 @@ static irqreturn_t omap8250_irq(int irq, void *dev_id)
 
 		up->ier = port->serial_in(port, UART_IER);
 		if (up->ier & (UART_IER_RLSI | UART_IER_RDI)) {
+			spin_lock(&port->lock);
 			port->ops->stop_rx(port);
+			spin_unlock(&port->lock);
 		} else {
 			/* Keep restarting the timer until
 			 * the input overrun subsides.



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