linux-kernel - [PATCH AUTOSEL for 4.14 39/97] gpio: label descriptors using the device name

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Message-ID: <20180319155411.12348-39-alexander.levin@microsoft.com>
Date:   Mon, 19 Mar 2018 15:55:15 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Linus Walleij <linus.walleij@...aro.org>,
        "Reported-by : Jason Kridner" <jkridner@...gleboard.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.14 39/97] gpio: label descriptors using the
 device name

From: Linus Walleij <linus.walleij@...aro.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@...gleboard.org>
Reported-by: Jason Kridner <jkridner@...gleboard.org>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/gpio/gpiolib.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index bdd68ff197dc..b4c8b25453a6 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -3340,7 +3340,8 @@ struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
 		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);
 
-- 
2.14.1