From mboxrd@z Thu Jan 1 00:00:00 1970 From: Grant Likely Subject: [PATCH] tty/serial: Fix uninitialized variable warning Date: Mon, 4 Mar 2013 09:35:07 +0800 Message-ID: <1362360907-4439-1-git-send-email-grant.likely@secretlab.ca> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Grant Likely , Greg Kroah-Hartman List-Id: linux-serial@vger.kernel.org drivers/tty/serial/8250/8250.c: In function 'serial_unlink_irq_chain': drivers/tty/serial/8250/8250.c:1676:19: warning: 'i' may be used uninitialized in this function There isn't an actual bug here since the function tests the condition that would cause i to be uninitialized before dereferencing i. However, at least some versions of GCC complain as shown above. (in my case, powerpc gcc 2.5.2). Initializing i to NULL makes it clear to GCC and the casual code reviewer that i will not be dereferenced to a random address. Signed-off-by: Grant Likely Cc: Greg Kroah-Hartman --- Greg, some may argue that this is a tool problem, not a kernel problem, but it is useful to me. If anyone objects I'm not going to spend any time championing for this patch. g. drivers/tty/serial/8250/8250.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/8250/8250.c b/drivers/tty/serial/8250/8250.c index 0efc815..cbbedcf 100644 --- a/drivers/tty/serial/8250/8250.c +++ b/drivers/tty/serial/8250/8250.c @@ -1673,7 +1673,7 @@ static int serial_link_irq_chain(struct uart_8250_port *up) static void serial_unlink_irq_chain(struct uart_8250_port *up) { - struct irq_info *i; + struct irq_info *i = NULL; struct hlist_node *n; struct hlist_head *h; -- 1.7.10.4