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The phram MTD driver may map any memory pages no matter whether it's reserved or whatever used for systems, which basically allows user bypassing the lock down. Add the check and abort the probe if the kernel is locked down for LOCKDOWN_DEV_MEM. Reported-by: Fabian Vogt <fvogt@suse.com> Suggested-by: Fabian Vogt <fvogt@suse.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Acked-by: Richard Weinberger <richard@nod.at> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>