linux-kernel - [PATCH] drivers/tty/serial: deal with 8250

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Date:	Wed, 19 Feb 2014 15:00:13 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Jiri Slaby <jslaby@...e.cz>, <linux-serial@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Alan Cox <alan@...ux.intel.com>
Subject: [PATCH] drivers/tty/serial: deal with 8250_core.c uninitialized warning for good

Every couple of months, someone sends a patch to fix:

drivers/tty/serial/8250/8250_core.c: In function 'serial_unlink_irq_chain':
drivers/tty/serial/8250/8250_core.c:1712:2: warning: 'i' may be used uninitialized in this function [-Wuninitialized]

and they in turn get a NACK for their efforts, and are told that
their compiler is broken.  This has been going on since at least
the year 2008:  https://lkml.org/lkml/2008/11/24/433

Lets add a comment, so that subsequent patches don't get as far as
the maintainers or the mailing lists.

Cc: Alan Cox <alan@...ux.intel.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 69932b7556cf..747073b8c38a 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -1694,6 +1694,10 @@ static int serial_link_irq_chain(struct uart_8250_port *up)
 
 static void serial_unlink_irq_chain(struct uart_8250_port *up)
 {
+	/*
+	 * yes, some broken gcc emit "warning: 'i' may be used uninitialized"
+	 * but no, we are not going to take a patch that assigns NULL below.
+	 */
 	struct irq_info *i;
 	struct hlist_node *n;
 	struct hlist_head *h;
-- 
1.8.5.2

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