Input: fix EVIOCGNAME/JSIOCGNAME regression

Commit 3d5cb60e ("Input: simplify name handling for certain input
handles") introduced a regression for the EVIOCGNAME/JSIOCGNAME
ioctl.

Before this, patch, the platform device's name was given back to
userspace which was good to identify devices. After this patch, the
device is ("event%d", minor) which is not descriptive at all.

This fixes the behaviour by taking dev->name.
Reported-by: NSven Neumann <s.neumann@raumfeld.com>
Signed-off-by: NDaniel Mack <daniel@caiaq.de>
Reviewed-by: NThadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
Signed-off-by: NDmitry Torokhov <dtor@mail.ru>

drivers/input/evdev.c

@@ -608,8 +608,7 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
 						    p, compat_mode);
 
 			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
-				return str_to_user(dev_name(&evdev->dev),
-						   _IOC_SIZE(cmd), p);
+				return str_to_user(dev->name, _IOC_SIZE(cmd), p);
 
 			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
 				return str_to_user(dev->phys, _IOC_SIZE(cmd), p);

drivers/input/joydev.c

@@ -536,7 +536,7 @@ static int joydev_ioctl_common(struct joydev *joydev,
 	default:
 		if ((cmd & ~IOCSIZE_MASK) == JSIOCGNAME(0)) {
 			int len;
-			const char *name = dev_name(&dev->dev);
+			const char *name = dev->name;
 
 			if (!name)
 				return 0;