serial: mpc52xx_uart: fix null pointer dereference

Commit 6acc6833510db8f72b5ef343296d97480555fda9
introduced NULL pointer dereference and kernel crash
on ppc32 machines while booting. Fix this bug now.

Reported-by: Leonardo Chiquitto <leonardo.lists@gmail.com>
Tested-by: Leonardo Chiquitto <leonardo.lists@gmail.com>
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/serial/mpc52xx_uart.c b/drivers/serial/mpc52xx_uart.c
index a176ab4..02469c3 100644 (file)
--- a/drivers/serial/mpc52xx_uart.c
+++ b/drivers/serial/mpc52xx_uart.c
@@ -1467,7 +1467,7 @@ mpc52xx_uart_init(void)
        /*
         * Map the PSC FIFO Controller and init if on MPC512x.
         */
-       if (psc_ops->fifoc_init) {
+       if (psc_ops && psc_ops->fifoc_init) {
                ret = psc_ops->fifoc_init();
                if (ret)
                        return ret;