tree dc2aa404a4cb480f58fbc503bcf5826a3a03f597
parent fc3f341b5a1a3f26ec8ed74a38234db7d0d1bae1
author Alex Williamson <alex.williamson@hp.com> 1209374049 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1209398310 -0700

serial 8250: tighten test for using backup timer

Thomas Koeller had reported an issue where a device that had been making use
of the UART_BUG_TXEN code in the 8250 driver was mistakenly being caught by
the backup timer test, causing the device to work improperly.

To fix this, tighten the test requirements to enable the backup timer
workaround.

The backup timer is really meant to catch UARTs that don't re-assert the THRE
interrupt.  The expectation is that they do initially assert THRE.  This patch
clarifies the test.

Signed-off-by: Alex Williamson <alex.williamson@hp.com>
Cc: Thomas Koeller <thomas@koeller.dyndns.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>