This is a note to let you know that I've just added the patch titled
gpio: Move freeing of GPIO hogs before numbing of the device
to the 4.9-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:
gpio-move-freeing-of-gpio-hogs-before-numbing-of-the-device.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5018ada69a04c8ac21d74bd682fceb8e42dc0f96 Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Date: Mon, 19 Dec 2016 18:29:23 +0100
Subject: gpio: Move freeing of GPIO hogs before numbing of the device
From: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
commit 5018ada69a04c8ac21d74bd682fceb8e42dc0f96 upstream.
When removing a gpiochip that uses GPIO hogging (e.g. by unloading the
chip's DT overlay), a warning is printed:
gpio gpiochip8: REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED
This happens because gpiochip_free_hogs() is called after the gdev->chip
pointer is reset to NULL. Hence __gpiod_free() cannot determine the
chip in use, and cannot clear flags nor call the optional chip-specific
.free() callback.
Move the call to gpiochip_free_hogs() up to fix this.
Fixes: ff2b135922992756 ("gpio: make the gpiochip a real device")
Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpio/gpiolib.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1317,12 +1317,12 @@ void gpiochip_remove(struct gpio_chip *c
/* FIXME: should the legacy sysfs handling be moved to gpio_device? */
gpiochip_sysfs_unregister(gdev);
+ gpiochip_free_hogs(chip);
/* Numb the device, cancelling all outstanding operations */
gdev->chip = NULL;
gpiochip_irqchip_remove(chip);
acpi_gpiochip_remove(chip);
gpiochip_remove_pin_ranges(chip);
- gpiochip_free_hogs(chip);
of_gpiochip_remove(chip);
/*
* We accept no more calls into the driver from this point, so
Patches currently in stable-queue which might be from geert@xxxxxxxxxxxxxx are
queue-4.9/gpio-move-freeing-of-gpio-hogs-before-numbing-of-the-device.patch
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