Re: [PATCH 2/2] drivers: libata-core: Use usleep_range() instead of msleep() for short sleeps (<20 ms)

On Thu, Jan 07, 2016 at 09:18:52PM -0800, Daniel Walker wrote:

From: Anil Veliyankara Madam <redacted>

Since msleep() may sleep longer than intended time for values less
than 20ms, this patch allows the use of usleep_range for waits less
that 20ms. usleep_range is a finer precision implementation of
msleep and is designed to be a drop-in replacement for udelay
where a precise sleep/busy-wait is unnecessary.

More details can be found at http://lkml.org/lkml/2007/8/3/250
and in Documentation/timers/timers-howto.txt.

This change has been done to improve the performace in PIO6 mode
which is used by viking flash.

Cc: xe-kernel@external.cisco.com
Signed-off-by: Anil Veliyankara Madam <redacted>
Signed-off-by: Shikha Jain <redacted>

Applied to libata/for-4.5.

Thanks.

-- 
tejun