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

commit bbcd18d1b37413d25eaf4580682b1b8e4a09ff5e upstream.

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>
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 18130f11238e6025b16682c9a00cca218727e370..8c0dd1361d30618ffd4f83c99c4ee8decdf90868 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);