This is a note to let you know that I've just added the patch titled
sc16is7xx: Set iobase to device index
to the 4.19-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:
sc16is7xx-set-iobase-to-device-index.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit c6d4f20ff6d4772957103caef35369968a484216
Author: Daniel Mack <daniel@xxxxxxxxxx>
Date: Tue Sep 1 14:03:29 2020 +0200
sc16is7xx: Set iobase to device index
[ Upstream commit 5da6b1c079e6804a81e63ab8337224cbd2148c91 ]
Some derivates of sc16is7xx devices expose more than one tty device to
userspace. If multiple such devices exist in a system, userspace
currently has no clean way to infer which tty maps to which physical
line.
Set the .iobase value to the relative index within the device to allow
infering the order through sysfs.
Signed-off-by: Daniel Mack <daniel@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20200901120329.4176302-1-daniel@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Stable-dep-of: 2861ed4d6e6d ("serial: sc16is7xx: fix broken port 0 uart init")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 453cdcc9f3223..1ff48f827b2c3 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -1264,6 +1264,7 @@ static int sc16is7xx_probe(struct device *dev,
s->p[i].port.type = PORT_SC16IS7XX;
s->p[i].port.fifosize = SC16IS7XX_FIFO_SIZE;
s->p[i].port.flags = UPF_FIXED_TYPE | UPF_LOW_LATENCY;
+ s->p[i].port.iobase = i;
s->p[i].port.iotype = UPIO_PORT;
s->p[i].port.uartclk = freq;
s->p[i].port.rs485_config = sc16is7xx_config_rs485;
