linux-kernel - [PATCH LINUX v4 06/13] tty: xuartps: Move request

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Date:	Sat, 5 Dec 2015 20:39:22 -0800
From:	Soren Brinkmann <soren.brinkmann@...inx.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.com>
CC:	Michal Simek <michal.simek@...inx.com>,
	<linux-serial@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	"Peter Hurley" <peter@...leysoftware.com>,
	Moritz Fischer <moritz.fischer@...us.com>,
	Soren Brinkmann <soren.brinkmann@...inx.com>
Subject: [PATCH LINUX v4 06/13] tty: xuartps: Move request_irq to after setting up the HW

Request_irq() should be _after_ h/w programming, otherwise an
interrupt could be triggered and in-progress before the h/w has been
setup.

Reported-by: Peter Hurley <peter@...leysoftware.com>
Signed-off-by: Soren Brinkmann <soren.brinkmann@...inx.com>
---
v4:
 - this patch has been added. Thanks to Peter for pointing it out and providing
   commit message
---
 drivers/tty/serial/xilinx_uartps.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 6ffd3bbe3e18..1e9053656610 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -759,12 +759,7 @@ static void cdns_uart_set_termios(struct uart_port *port,
 static int cdns_uart_startup(struct uart_port *port)
 {
 	unsigned long flags;
-	unsigned int retval = 0, status = 0;
-
-	retval = request_irq(port->irq, cdns_uart_isr, 0, CDNS_UART_NAME,
-								(void *)port);
-	if (retval)
-		return retval;
+	unsigned int status = 0;
 
 	spin_lock_irqsave(&port->lock, flags);
 
@@ -818,7 +813,7 @@ static int cdns_uart_startup(struct uart_port *port)
 
 	spin_unlock_irqrestore(&port->lock, flags);
 
-	return retval;
+	return request_irq(port->irq, cdns_uart_isr, 0, CDNS_UART_NAME, port);
 }
 
 /**
-- 
2.6.3.3.g9bb996a

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