Patch "gpio: Move freeing of GPIO hogs before numbing of the device" has been added to the 4.9-stable tree

Patch "gpio: Move freeing of GPIO hogs before numbing of the device" has been added to the 4.9-stable tree

[gregkh]

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@vger.kernel.org> know about it.


>From 5018ada69a04c8ac21d74bd682fceb8e42dc0f96 Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven <geert@linux-m68k.org>
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@linux-m68k.org>

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@linux-m68k.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 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@linux-m68k.org are

queue-4.9/gpio-move-freeing-of-gpio-hogs-before-numbing-of-the-device.patch