diff options
| author | Soren Brinkmann <soren.brinkmann@xilinx.com> | 2016-01-11 17:41:36 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-06 22:52:23 -0800 |
| commit | 55861d11c5c804f053411b6e5505d19f561e46a3 (patch) | |
| tree | 38cd12d149aa9ea839f7f9f77b010db555915bc2 /drivers/tty | |
| parent | 5ede4a5cde278af46aacecca25470943b8c5a086 (diff) | |
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@hurleysoftware.com>
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/xilinx_uartps.c | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index db9e23eaf300..5da1c51e9e40 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -762,13 +762,9 @@ static void cdns_uart_set_termios(struct uart_port *port, */ static int cdns_uart_startup(struct uart_port *port) { + int ret; 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); @@ -814,15 +810,22 @@ static int cdns_uart_startup(struct uart_port *port) writel(readl(port->membase + CDNS_UART_ISR_OFFSET), port->membase + CDNS_UART_ISR_OFFSET); + spin_unlock_irqrestore(&port->lock, flags); + + ret = request_irq(port->irq, cdns_uart_isr, 0, CDNS_UART_NAME, port); + if (ret) { + dev_err(port->dev, "request_irq '%d' failed with %d\n", + port->irq, ret); + return ret; + } + /* Set the Interrupt Registers with desired interrupts */ writel(CDNS_UART_IXR_TXEMPTY | CDNS_UART_IXR_PARITY | CDNS_UART_IXR_FRAMING | CDNS_UART_IXR_OVERRUN | CDNS_UART_IXR_RXTRIG | CDNS_UART_IXR_TOUT, port->membase + CDNS_UART_IER_OFFSET); - spin_unlock_irqrestore(&port->lock, flags); - - return retval; + return 0; } /** |