From 7d18f0a14aa6a0d6bad39111c1fb655f07f71d59 Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@linaro.org>
Date: Tue, 16 Jan 2018 08:29:50 +0100
Subject: [PATCH] gpio: No NULL owner
Git-commit: 7d18f0a14aa6a0d6bad39111c1fb655f07f71d59
Patch-mainline: v4.16-rc1
References: bsc#1051510
Sometimes a GPIO is fetched with NULL as parent device, and
that is just fine. So under these circumstances, avoid using
dev_name() to provide a name for the GPIO line.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpio/gpiolib.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index bf083bc58d30..4092b8601c4e 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -3623,6 +3623,8 @@ struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
struct gpio_desc *desc = NULL;
int status;
enum gpio_lookup_flags lookupflags = 0;
+ /* Maybe we have a device name, maybe not */
+ const char *devname = dev ? dev_name(dev) : "?";
dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id);
@@ -3651,8 +3653,11 @@ struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
return desc;
}
- /* 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 a connection label was passed use that, else attempt to use
+ * the device name as label
+ */
+ status = gpiod_request(desc, con_id ? con_id : devname);
if (status < 0)
return ERR_PTR(status);
--
2.17.1