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serial: core: lock port for start_rx() in uart_resume_port() 

[ Upstream commit 51e45fba14 ]

The only user of the start_rx() callback (qcom_geni) directly calls
its own stop_rx() callback. Since stop_rx() requires that the
port->lock is taken and interrupts are disabled, the start_rx()
callback has the same requirement.

Fixes: cfab87c2c2 ("serial: core: Introduce callback for start_rx and do stop_rx in suspend only if this callback implementation is present.")
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20230525093159.223817-5-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 11:37:55 +02:06 committed by Greg Kroah-Hartman
parent 65a7cfc009
commit 3a1ab191e0
1 changed files with 4 additions and 1 deletions
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5
drivers/tty/serial/serial_core.c
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@ -2431,8 +2431,11 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *uport)
if (console_suspend_enabled)
uart_change_pm(state, UART_PM_STATE_ON);
uport->ops->set_termios(uport, &termios, NULL);
if (!console_suspend_enabled && uport->ops->start_rx)
if (!console_suspend_enabled && uport->ops->start_rx) {
spin_lock_irq(&uport->lock);
uport->ops->start_rx(uport);
spin_unlock_irq(&uport->lock);
}
if (console_suspend_enabled)
console_start(uport->cons);
}