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Similar code for validating the host->max_busy_timeout towards the current command's busy timeout, exists in mmc_do_erase(), mmc_sleep() and __mmc_switch(). Let's move the common code into a helper function. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com> Acked-by: Avri Altman <avri.altman@wdc.com> Link: https://lore.kernel.org/r/20210504161222.101536-2-ulf.hansson@linaro.org