Patch "gpio: label descriptors using the device name" has been added to the 4.15-stable tree

Patch "gpio: label descriptors using the device name" has been added to the 4.15-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    gpio: label descriptors using the device name

to the 4.15-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-label-descriptors-using-the-device-name.patch
and it can be found in the queue-4.15 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 foo@baz Mon Apr  9 10:16:32 CEST 2018
From: Linus Walleij <linus.walleij@linaro.org>
Date: Thu, 4 Jan 2018 22:31:11 +0100
Subject: gpio: label descriptors using the device name

From: Linus Walleij <linus.walleij@linaro.org>


[ Upstream commit 24e78079bf2250874e33da2e7cfbb6db72d3caf4 ]

Some GPIO lines appear named "?" in the lsgpio dump due to their
requesting drivers not passing a reasonable label.

Most typically this happens if a device tree node just defines
gpios = <...> and not foo-gpios = <...>, the former gets named
"foo" and the latter gets named "?".

However the struct device passed in is always valid so let's
just label the GPIO with dev_name() on the device if no proper
label was passed.

Cc: Reported-by: Jason Kridner <jkridner@beagleboard.org>
Reported-by: Jason Kridner <jkridner@beagleboard.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpio/gpiolib.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -3647,7 +3647,8 @@ struct gpio_desc *__must_check gpiod_get
 		return desc;
 	}
 
-	status = gpiod_request(desc, con_id);
+	/* If a connection label was passed use that, else use the device name as label */
+	status = gpiod_request(desc, con_id ? con_id : dev_name(dev));
 	if (status < 0)
 		return ERR_PTR(status);
 


Patches currently in stable-queue which might be from linus.walleij@linaro.org are

queue-4.15/gpio-label-descriptors-using-the-device-name.patch
queue-4.15/gpio-thunderx-fix-error-return-code-in-thunderx_gpio_probe.patch
queue-4.15/bluetooth-hci_bcm-mandate-presence-of-shutdown-and-device-wake-gpio.patch
queue-4.15/pinctrl-baytrail-enable-glitch-filter-for-gpios-used-as-interrupts.patch
queue-4.15/gpiolib-don-t-dereference-a-desc-before-validation.patch