From: Chen Gang <gang.chen@asianux.com>
Date: Thu, 27 Dec 2012 07:51:31 +0000 (+0800)
Subject: drivers/tty/serial: extern function which for release resource, need check pointer... 
X-Git-Tag: v3.9-rc1~125^2~96
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b342dd512f7af0e0e14e29c3e1f863150cfc46ff;p=pandora-kernel.git

drivers/tty/serial: extern function which for release resource, need check pointer, before free it

  for extern function uart_remove_one_port:
    need check pointer whether be NULL, before the main work.
    just like what the other extern function uart_add_one_port has done.
    uart_add_one_port and uart_remove_one_port are pair

  information:
    for the callers (such as drivers/tty/serial/jsm: jsm_tty.c, jsm_driver.c)
    they realy assume that:
      they still can call uart_remove_one_port, after uart_add_one_port failed
    we (as an extern function), have to understand it (just like kfree).

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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