serial: imx: fix a possible NULL dereference

of_match_device could return NULL, and so cause a NULL pointer
dereference later.
Even if the probability of this case is very low, fixing it made
static analyzers happy.
Solving this with of_device_get_match_data made also code simplier.

Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 016e4be..76818f5 100644 (file)
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1857,11 +1857,10 @@ static int serial_imx_probe_dt(struct imx_port *sport,
                struct platform_device *pdev)
 {
        struct device_node *np = pdev->dev.of_node;
-       const struct of_device_id *of_id =
-                       of_match_device(imx_uart_dt_ids, &pdev->dev);
        int ret;
 
-       if (!np)
+       sport->devdata = of_device_get_match_data(&pdev->dev);
+       if (!sport->devdata)
                /* no device tree device */
                return 1;
 
@@ -1878,8 +1877,6 @@ static int serial_imx_probe_dt(struct imx_port *sport,
        if (of_get_property(np, "fsl,dte-mode", NULL))
                sport->dte_mode = 1;
 
-       sport->devdata = of_id->data;
-
        return 0;
 }
 #else