Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1284797

[PATCH LINUX v4 06/13] tty: xuartps: Move request_irq to after setting up the HW

Show all headers | View raw

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@hurleysoftware.com>
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

[PATCH LINUX v4 06/13] tty: xuartps: Move request_irq to after setting up the HW Soren Brinkmann <soren.brinkmann@xilinx.com> - 2015-12-06 05:50 +0100
  Re: [PATCH LINUX v4 06/13] tty: xuartps: Move request_irq to after  setting up the HW Peter Hurley <peter@hurleysoftware.com> - 2015-12-10 22:50 +0100

csiph-web