From: Peter Hurley <peter@hurleysoftware.com>
Date: Tue, 2 Sep 2014 21:39:19 +0000 (-0400)
Subject: serial: core: Document lock requirement for UPF_* flags updates
X-Git-Tag: fixes-for-v3.18-merge-window~14^2~64
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8a949b07e4062cbd07e04e6a47249e69ca65b944;p=pandora-kernel.git

serial: core: Document lock requirement for UPF_* flags updates

The flags field of struct uart_port can only be safely modified
if the port mutex is held; no other lock prevents concurrent
changes from corrupting the field.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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