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Commit 572d4836 authored by Florian Fainelli's avatar Florian Fainelli Committed by Greg Kroah-Hartman
Browse files

serial: 8250: Add missing wakeup event reporting 



[ Upstream commit 0ba9e3a13c6adfa99e32b2576d20820ab10ad48a ]

An 8250 UART configured as a wake-up source would not have reported
itself through sysfs as being the source of wake-up, correct that.

Fixes: b3b708fa ("wake up from a serial port")
Signed-off-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20230414170241.2016255-1-f.fainelli@gmail.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 488baa80

drivers/tty/serial/8250/8250_port.c

+4 −0
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 
#include <linux/moduleparam.h>

#include <linux/ioport.h>

#include <linux/init.h>

#include <linux/irq.h>

#include <linux/console.h>

#include <linux/sysrq.h>

#include <linux/delay.h>
@@ -1840,6 +1841,7 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir) 
	unsigned char status;

	unsigned long flags;

	struct uart_8250_port *up = up_to_u8250p(port);

	struct tty_port *tport = &port->state->port;

	bool skip_rx = false;



	if (iir & UART_IIR_NO_INT)
@@ -1863,6 +1865,8 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir) 
		skip_rx = true;



	if (status & (UART_LSR_DR | UART_LSR_BI) && !skip_rx) {

		if (irqd_is_wakeup_set(irq_get_irq_data(port->irq)))

			pm_wakeup_event(tport->tty->dev, 0);

		if (!up->dma || handle_rx_dma(up, iir))

			status = serial8250_rx_chars(up, status);

	}