[PATCH] ARM: OMAP: MUX dump stack on invalid request

OMAP MUX: dump stack on invalid requests if CONFIG_DEBUG_ERROR,
to show what code made the bad request.
Signed-off-by: Todd Poynor <tpoynor@mvista.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/plat-omap/mux.c

@@ -25,6 +25,7 @@
 #include <linux/config.h>
 #include <linux/module.h>
 #include <linux/init.h>
+#include <linux/kernel.h>
 #include <asm/system.h>
 #include <asm/io.h>
 #include <linux/spinlock.h>
@@ -70,6 +71,7 @@ int __init_or_module omap_cfg_reg(const unsigned long index)
 	if (index >= pin_table_sz) {
 		printk(KERN_ERR "Invalid pin mux index: %lu (%lu)\n",
 		       index, pin_table_sz);
+		dump_stack();
 		return -ENODEV;
 	}