serial: MIPS: lantiq: fix clock error check

The clock should be checked with the proper IS_ERR() api before using it.

Signed-off-by: John Crispin <blogic@openwrt.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/lantiq.c b/drivers/tty/serial/lantiq.c
index 93ac04686eb95f63e52052262fb591c4bbeea687..88d01e0bb0c8e34122e0ab7c0f26d1e48b78bd13 100644 (file)
--- a/drivers/tty/serial/lantiq.c
+++ b/drivers/tty/serial/lantiq.c
@@ -318,7 +318,7 @@ lqasc_startup(struct uart_port *port)
        struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
        int retval;
 
-       if (ltq_port->clk)
+       if (!IS_ERR(ltq_port->clk))
                clk_enable(ltq_port->clk);
        port->uartclk = clk_get_rate(ltq_port->fpiclk);
 
@@ -386,7 +386,7 @@ lqasc_shutdown(struct uart_port *port)
                port->membase + LTQ_ASC_RXFCON);
        ltq_w32_mask(ASCTXFCON_TXFEN, ASCTXFCON_TXFFLU,
                port->membase + LTQ_ASC_TXFCON);
-       if (ltq_port->clk)
+       if (!IS_ERR(ltq_port->clk))
                clk_disable(ltq_port->clk);
 }