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[ Upstream commit 37c5f9e80e015d0df17d0c377c18523002986851 ] Commit46b5889cc2("mtd: implement proper partition handling") started using "mtd_get_master_ofs()" in mtd callbacks to determine memory offsets by means of 'part' field from mtd_info, what previously was smashed accessing 'master' field in the mtd_set_dev_defaults() method. That provides wrong offset what causes hardware access errors. Just make 'part', 'master' as separate fields, rather than using union type to avoid 'part' data corruption when mtd_set_dev_defaults() is called. Fixes:46b5889cc2("mtd: implement proper partition handling") Signed-off-by: Oleksandr Ocheretnyi <oocheret@cisco.com> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/20220417184649.449289-1-oocheret@cisco.com Signed-off-by: Sasha Levin <sashal@kernel.org>