From: Peter Hurley <peter@hurleysoftware.com>
Date: Mon, 9 Mar 2015 18:05:01 +0000 (-0400)
Subject: serial: 8250: Check UART_SCR is writable
X-Git-Tag: omap-for-v4.2/o2_dc~64^2~38
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f01a0bd8921b9d6668d41fae3198970e6318f532;p=pandora-kernel.git

serial: 8250: Check UART_SCR is writable

Au1x00/RT2800+ doesn't implement the 8250 scratch register (and
this may be true of other h/w currently supported by the 8250 driver);
read back the canary value written to the scratch register to enable
the console h/w restart after resume from system suspend.

Fixes: 4516d50aabedb ("serial: 8250: Use canary to restart console ...")
Reported-by: Mason <slash.tmp@free.fr>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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