gpiolib: Fix crash on error in gpiochip_get_ngpios()

BugLink: https://bugs.launchpad.net/bugs/2104873

[ Upstream commit 7b4aebe ]

The gpiochip_get_ngpios() uses chip_*() macros to print messages.
However these macros rely on gpiodev to be initialised and set,
which is not the case when called via bgpio_init(). In such a case
the printing messages will crash on NULL pointer dereference.
Replace chip_*() macros by the respective dev_*() ones to avoid
such crash.

Fixes: 55b2395 ("gpio: mmio: handle "ngpios" properly in bgpio_init()")
Signed-off-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bartosz Golaszewski <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
Signed-off-by: Noah Wager <[email protected]>
Signed-off-by: Mehmet Basaran <[email protected]>

Author: andy-shev

drivers/gpio/gpiolib.c

@@ -902,13 +902,13 @@ int gpiochip_get_ngpios(struct gpio_chip *gc, struct device *dev)
 	}
 
 	if (gc->ngpio == 0) {
-		chip_err(gc, "tried to insert a GPIO chip with zero lines\n");
+		dev_err(dev, "tried to insert a GPIO chip with zero lines\n");
 		return -EINVAL;
 	}
 
 	if (gc->ngpio > FASTPATH_NGPIO)
-		chip_warn(gc, "line cnt %u is greater than fast path cnt %u\n",
-			gc->ngpio, FASTPATH_NGPIO);
+		dev_warn(dev, "line cnt %u is greater than fast path cnt %u\n",
+			 gc->ngpio, FASTPATH_NGPIO);
 
 	return 0;
 }