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[ Upstream commit ddc10938e08cd7aac63d8385f7305f7889df5179 ] switchtec_dev_read() didn't handle copy_to_user() errors correctly: it assigned "rc = -EFAULT", but actually returned either "size", -ENXIO, or -EBADMSG instead. Update the failure cases to unlock mrpc_mutex and return -EFAULT directly. Link: https://lore.kernel.org/r/20221216162126.207863-3-helgaas@kernel.org Fixes: 080b47def5e5 ("MicroSemi Switchtec management interface driver") Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Logan Gunthorpe <logang@deltatee.com> Signed-off-by: Sasha Levin <sashal@kernel.org>