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serial: 8250_exar: Replace msleep(1) with usleep_range() 

As explained in Documentation/timers/timers-howto.rst
the small amount of milliseconds sometimes produces
much longer delays.

Replace msleep(1) with usleep_range(1000, 1100).

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20190805142535.21948-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko 2019-08-05 17:25:35 +03:00 committed by Greg Kroah-Hartman
parent 653d00c8d0
commit 3f72879e00
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/serial/8250/8250_exar.c
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@ -180,7 +180,7 @@ static void exar_shutdown(struct uart_port *port)
tx_complete = 1;
else
tx_complete = 0;
msleep(1);
usleep_range(1000, 1100);
} while (!uart_circ_empty(xmit) && !tx_complete && i++ < 1000);
serial8250_do_shutdown(port);