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As bcmnand_ctrl_poll_status() return negative errno, so return true if sts < 0. The < 0 case does not exist for wait_for_completion_timeout(), so return true if sts = 0 and zero otherwise. Both of the true return of them can be considered as a -ETIMEDOUT err, so return -ETIMEDOUT if err is true to propagate err from its caller. Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com> Reviewed-by: William Zhang <william.zhang@broadcom.com> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/20230808032943.3890545-1-ruanjinjie@huawei.com