This is a note to let you know that I've just added the patch titled
serial: 8250: Add missing wakeup event reporting
to the 4.14-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-add-missing-wakeup-event-reporting.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 2eed74e61146367d4ccf4a0b7d8c06bcbf9d633b
Author: Florian Fainelli <f.fainelli@xxxxxxxxx>
Date: Fri Apr 14 10:02:39 2023 -0700
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: b3b708fa2780 ("wake up from a serial port")
Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
Link: https://lore.kernel.org/r/20230414170241.2016255-1-f.fainelli@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index fe1de63269d1a..cdc1b2b0f4bc6 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -23,6 +23,7 @@
#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>
@@ -1886,6 +1887,7 @@ 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)
@@ -1909,6 +1911,8 @@ 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);
}
