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The GPIO registers need protection from concurrent access for operations that are not atomic. Cc: stable@kernel.org Cc: Juergen Beisert <j.beisert@pengutronix.de> Cc: Daniel Mack <daniel@caiaq.de> Reported-by: rpkamiak@rockwellcollins.com Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>