[POWERPC] Fix panic in RTAS code

Some older pSeries machines were panicking in pSeries_log_error
because it was getting called before it was ready. This is a result
of commit "[POWERPC] pseries: Fix jumbled no_logging flag."
(79c0108d1b9db4864ab77b2a95dfa04f2dcf264c).

This fixes it by explicitly enabling RTAS error logging when it has
been initialized, and also makes the code clearer by renaming the
"no_more_logging" variable to "logging_enabled".

Signed-off-by: Tony Breeds <[e-mail]>
Signed-off-by: Paul Mackerras <[e-mail]>

arch/powerpc/platforms/pseries/rtasd.c

···
 static int full_rtas_msgs = 0;
 
 /* Stop logging to nvram after first fatal error */
-static int no_more_logging;
-
+static int logging_enabled; /* Until we initialize everything,
+                             * make sure we don't try logging
+                             * anything */
 static int error_log_cnt;
 
 /*
···
 	}
 
 	/* Write error to NVRAM */
-	if (!no_more_logging && !(err_type & ERR_FLAG_BOOT))
+	if (logging_enabled && !(err_type & ERR_FLAG_BOOT))
 		nvram_write_error_log(buf, len, err_type, error_log_cnt);
 
 	/*
···
 		printk_log_rtas(buf, len);
 
 	/* Check to see if we need to or have stopped logging */
-	if (fatal || no_more_logging) {
-		no_more_logging = 1;
+	if (fatal || !logging_enabled) {
+		logging_enabled = 0;
 		spin_unlock_irqrestore(&rtasd_log_lock, s);
 		return;
 	}
···
 
 	spin_lock_irqsave(&rtasd_log_lock, s);
 	/* if it's 0, then we know we got the last one (the one in NVRAM) */
-	if (rtas_log_size == 0 && !no_more_logging)
+	if (rtas_log_size == 0 && logging_enabled)
 		nvram_clear_error_log();
 	spin_unlock_irqrestore(&rtasd_log_lock, s);
 
···
 	memset(logdata, 0, rtas_error_log_max);
 	rc = nvram_read_error_log(logdata, rtas_error_log_max,
 	                          &err_type, &error_log_cnt);
+	/* We can use rtas_log_buf now */
+	logging_enabled = 1;
 
 	if (!rc) {
 		if (err_type != ERR_FLAG_ALREADY_LOGGED) {