s390/vmwatchdog: do not use static data

Using static data for fields which are accessed by HW will fail if
the driver is build as a module (since this would be vmalloc'ed
memory). This Bug was revealed via
"s390: remove virt_to_phys implementation" - the old virt_to_phys
implementation would have translated the address but it was not
guaranteed that the memory was contiguous.

Fix it by putting the data on the stack.
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/char/vmwatchdog.c

@@ -112,7 +112,8 @@ static int vmwdt_keepalive(void)
 
 static int vmwdt_disable(void)
 {
-	int ret = __diag288(wdt_cancel, 0, "", 0);
+	char cmd[] = {'\0'};
+	int ret = __diag288(wdt_cancel, 0, cmd, 0);
 	WARN_ON(ret != 0);
 	clear_bit(VMWDT_RUNNING, &vmwdt_is_open);
 	return ret;
@@ -124,7 +125,7 @@ static int __init vmwdt_probe(void)
 	 * so we try initializing it with a NOP command ("BEGIN")
 	 * that won't cause any harm even if the following disable
 	 * fails for some reason */
-	static char __initdata ebc_begin[] = {
+	char ebc_begin[] = {
 		194, 197, 199, 201, 213
 	};
 	if (__diag288(wdt_init, 15, ebc_begin, sizeof(ebc_begin)) != 0)