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The qcom_nand_controller had a struct nand_controller *controller pointer that was assigned to (struct nand_controller *)&nandc[1], with the allocation oversized by sizeof(*controller) to make room. get_qcom_nand_controller() then walked backwards from chip->controller using sizeof()-based arithmetic to recover the enclosing nandc. Embed the nand_controller directly into qcom_nand_controller and use container_of() in get_qcom_nand_controller(). The header now needs the full rawnand.h definition rather than a forward declaration. Assisted-by: Claude:Opus-4.7 Signed-off-by: Rosen Penev <rosenp@gmail.com> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>