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From: Ian Lepore <ian@FreeBSD.org>
Date: Thu, 31 Oct 2013 03:12:48 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r257418 - head/sys/arm/freescale/imx
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Author: ian
Date: Thu Oct 31 03:12:48 2013
New Revision: 257418
URL: http://svnweb.freebsd.org/changeset/base/257418

Log:
  Don't iterate through the bits of the pending interrupt register if the
  whole register is zero.  Most of the registers will be zero most of the time.

Modified:
  head/sys/arm/freescale/imx/tzic.c

Modified: head/sys/arm/freescale/imx/tzic.c
==============================================================================
--- head/sys/arm/freescale/imx/tzic.c	Thu Oct 31 02:35:00 2013	(r257417)
+++ head/sys/arm/freescale/imx/tzic.c	Thu Oct 31 03:12:48 2013	(r257418)
@@ -163,7 +163,7 @@ arm_get_next_irq(int last_irq)
 
 	for (i = 0; i < 4; i++) {
 		pending = tzic_read_4(TZIC_PND(i));
-		for (b = 0; b < 32; b++)
+		for (b = 0; pending != 0 && b < 32; b++)
 			if (pending & (1 << b)) {
 				return (i * 32 + b);
 			}