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authorLinus Walleij <linus.walleij@linaro.org>2018-01-16 08:29:50 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-06-16 09:45:14 +0200
commitc7a372ddc3db9ab90a408917c040f6cc223a115f (patch)
treef36b5007396927d2ff63907e9f6d731fd558f530 /drivers/gpio/gpiolib.c
parent7d970250cb8dfb71768ed58dd80f06cd74a49c28 (diff)
gpio: No NULL owner
commit 7d18f0a14aa6a0d6bad39111c1fb655f07f71d59 upstream. 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> Cc: Daniel Rosenberg <drosen@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/gpio/gpiolib.c')
-rw-r--r--drivers/gpio/gpiolib.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 68ea6e712bf9..7e0bfd7347f6 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -3313,6 +3313,8 @@ 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);
@@ -3341,8 +3343,11 @@ 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);