powerpc/rtasd: Don't start event scan if scan rate is zero

There appear to be Pegasos systems which have the rtas-event-scan RTAS tokens, but on which the event scan always fails. They also have an event-scan-rate property containing 0, which means call event scan 0 times per minute. So interpret a scan rate of 0 to mean don't scan at all. This fixes the problem on the Pegasos machines and makes sense as well. Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
goeke · May 21, 2010 · 7358650 · 7358650
1 parent 78f6223
commit 7358650
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/arch/powerpc/kernel/rtasd.c b/arch/powerpc/kernel/rtasd.c
@@ -490,6 +490,12 @@ static int __init rtas_init(void)
 		return -ENODEV;
 	}
 
+	if (!rtas_event_scan_rate) {
+		/* Broken firmware: take a rate of zero to mean don't scan */
+		printk(KERN_DEBUG "rtasd: scan rate is 0, not scanning\n");
+		return 0;
+	}
+
 	/* Make room for the sequence number */
 	rtas_error_log_max = rtas_get_error_log_max();
 	rtas_error_log_buffer_max = rtas_error_log_max + sizeof(int);