powerpc/powernv: Use the "unknown" checkstop type as a fallback

The HMI code knows about three types of errors: CORE, NX and UNKNOWN.
If OPAL were to add a new type, it would not be handled at all since
there is no fallback case. Instead of explicitly checking for UNKNOWN,
treat any checkstop type without a handler as unknown.

Signed-off-by: Russell Currey <[e-mail]>
Reviewed-by: Daniel Axtens <[e-mail]>
Reviewed-by: Andrew Donnellan <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>

arch/powerpc/platforms/powernv/opal-hmi.c

···
 static void print_checkstop_reason(const char *level,
 					struct OpalHMIEvent *hmi_evt)
 {
-	switch (hmi_evt->u.xstop_error.xstop_type) {
+	uint8_t type = hmi_evt->u.xstop_error.xstop_type;
+	switch (type) {
 	case CHECKSTOP_TYPE_CORE:
 		print_core_checkstop_reason(level, hmi_evt);
 		break;
 	case CHECKSTOP_TYPE_NX:
 		print_nx_checkstop_reason(level, hmi_evt);
 		break;
-	case CHECKSTOP_TYPE_UNKNOWN:
-		printk("%s	Unknown Malfunction Alert.\n", level);
+	default:
+		printk("%s	Unknown Malfunction Alert of type %d\n",
+		       level, type);
 		break;
 	}
 }