iopoll: redefined readx_poll_timeout macro to simplify the code

 * macros defined below rather than this macro directly.

 */

#define readx_poll_timeout(op, addr, val, cond, sleep_us, timeout_us)	\

({ \

	u64 __timeout_us = (timeout_us); \

	unsigned long __sleep_us = (sleep_us); \

	ktime_t __timeout = ktime_add_us(ktime_get(), __timeout_us); \

	might_sleep_if((__sleep_us) != 0); \

	for (;;) { \

		(val) = op(addr); \

		if (cond) \

			break; \

		if (__timeout_us && \

		    ktime_compare(ktime_get(), __timeout) > 0) { \

			(val) = op(addr); \

			break; \

		} \

		if (__sleep_us) \

			usleep_range((__sleep_us >> 2) + 1, __sleep_us); \

	} \

	(cond) ? 0 : -ETIMEDOUT; \

})

	read_poll_timeout(op, val, cond, sleep_us, timeout_us, false, addr)

/**

 * readx_poll_timeout_atomic - Periodically poll an address until a condition is met or a timeout occurs