serial: imx: fix NULL dereference Oops when pdata == NULL

The platform code doesn't have to provide platform data to get sensible
default behaviour from the imx serial driver.

This patch does not handle NULL dereference in the IrDA case, which still
requires a valid platform data pointer (in imx_startup()/imx_shutdown()),
since I don't know whether there is a sensible default behaviour, or
should the operation just fail cleanly.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Cc: Baruch Siach <baruch@tkos.co.il>
Cc: Alan Cox <alan@linux.intel.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Oskar Schirmer <os@emlix.com>
Cc: Fabian Godehardt <fg@emlix.com>
Cc: Daniel Glöckner <dg@emlix.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/serial/imx.c b/drivers/serial/imx.c
index 60d665a17a885b280cd98b289dd783a58d9d4ac7..d00fcf8e6c70e0a68318da2a4ac83c1f29cc48a0 100644 (file)
--- a/drivers/serial/imx.c
+++ b/drivers/serial/imx.c
@@ -1279,7 +1279,7 @@ static int serial_imx_probe(struct platform_device *pdev)
                sport->use_irda = 1;
 #endif
 
-       if (pdata->init) {
+       if (pdata && pdata->init) {
                ret = pdata->init(pdev);
                if (ret)
                        goto clkput;
@@ -1292,7 +1292,7 @@ static int serial_imx_probe(struct platform_device *pdev)
 
        return 0;
 deinit:
-       if (pdata->exit)
+       if (pdata && pdata->exit)
                pdata->exit(pdev);
 clkput:
        clk_put(sport->clk);
@@ -1321,7 +1321,7 @@ static int serial_imx_remove(struct platform_device *pdev)
 
        clk_disable(sport->clk);
 
-       if (pdata->exit)
+       if (pdata && pdata->exit)
                pdata->exit(pdev);
 
        iounmap(sport->port.membase);