linux/debian/patches-rt/0166-tty-serial-pl011-explicitly-initialize-the-flags-var.patch

From 5efe8f58b68a6c29e56e1f8d2ee649f9fd51556c Mon Sep 17 00:00:00 2001
Message-Id: <5efe8f58b68a6c29e56e1f8d2ee649f9fd51556c.1596234183.git.zanussi@kernel.org>
In-Reply-To: <378ee68279f6a7631221f2670a9298620148690d.1596234183.git.zanussi@kernel.org>
References: <378ee68279f6a7631221f2670a9298620148690d.1596234183.git.zanussi@kernel.org>
From: Kurt Kanzenbach <kurt@linutronix.de>
Date: Mon, 24 Sep 2018 10:29:01 +0200
Subject: [PATCH 166/329] tty: serial: pl011: explicitly initialize the flags
 variable
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.135-rt60.tar.xz

Silence the following gcc warning:

drivers/tty/serial/amba-pl011.c: In function ‘pl011_console_write’:
./include/linux/spinlock.h:260:3: warning: ‘flags’ may be used uninitialized in this function [-Wmaybe-uninitialized]
   _raw_spin_unlock_irqrestore(lock, flags); \
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/tty/serial/amba-pl011.c:2214:16: note: ‘flags’ was declared here
  unsigned long flags;
                ^~~~~

The code is correct. Thus, initializing flags to zero doesn't change the
behavior and resolves the warning.

Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/tty/serial/amba-pl011.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index e00b8b6fdae1..55adaabb71ad 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -2209,7 +2209,7 @@ pl011_console_write(struct console *co, const char *s, unsigned int count)
 {
 	struct uart_amba_port *uap = amba_ports[co->index];
 	unsigned int old_cr = 0, new_cr;
-	unsigned long flags;
+	unsigned long flags = 0;
 	int locked = 1;
 
 	clk_enable(uap->clk);
-- 
2.17.1