linux-kernel - [PATCH 1/2] 8250: ratelimit LSR safety check engaged warning.

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Date:	Mon, 26 Sep 2011 09:14:34 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	linux-kernel@...r.kernel.org
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Alan Cox <alan@...ux.intel.com>, linux-serial@...r.kernel.org
Subject: [PATCH 1/2] 8250: ratelimit LSR safety check engaged warning.

On my BIOSTAR TA890FXE the ttyS0 ends up spewing:

[904682.485933] ttyS0: LSR safety check engaged!
[904692.505895] ttyS0: LSR safety check engaged!
[904702.525972] ttyS0: LSR safety check engaged!
[904712.545967] ttyS0: LSR safety check engaged!
[904722.566125] ttyS0: LSR safety check engaged!
..
lets limit it so it won't be the only thing visible
in the ring buffer.

CC: Greg Kroah-Hartman <gregkh@...e.de>
CC: Alan Cox <alan@...ux.intel.com>
CC: linux-serial@...r.kernel.org
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
---
 drivers/tty/serial/8250.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/8250.c b/drivers/tty/serial/8250.c
index 7f50999..fc5e9ac 100644
--- a/drivers/tty/serial/8250.c
+++ b/drivers/tty/serial/8250.c
@@ -2081,8 +2081,8 @@ static int serial8250_startup(struct uart_port *port)
 	 */
 	if (!(up->port.flags & UPF_BUGGY_UART) &&
 	    (serial_inp(up, UART_LSR) == 0xff)) {
-		printk(KERN_INFO "ttyS%d: LSR safety check engaged!\n",
-		       serial_index(&up->port));
+		printk_ratelimited(KERN_INFO "ttyS%d: LSR safety check engaged!\n",
+				   serial_index(&up->port));
 		return -ENODEV;
 	}
 
-- 
1.7.4.1

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