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Add groups field to struct miscdevice for passing the attribute groups at device creation. In this way, the driver can avoid the manual call of device_create_file() after the device registration, which is basically a racy operation, in addition to the reduction of manual device_remove_file() calls. Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>