From d9396f80087fb464f43c56b84c7fc9c7fb8018b7 Mon Sep 17 00:00:00 2001
From: Stephen Hemminger <stephen.hemminger@vyatta.com>
Date: Fri, 25 Feb 2011 09:05:51 -0800
Subject: Don't set irq affinity if device is disabled

Bug 6784
No point in trying to force affinity if device is offline.
(cherry picked from commit b541f5ffa7bf1c6951e01ae4814e0cd38adc42d5)
---
 scripts/system/irq-affinity.pl | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/scripts/system/irq-affinity.pl b/scripts/system/irq-affinity.pl
index 99d37bbc..23da4635 100755
--- a/scripts/system/irq-affinity.pl
+++ b/scripts/system/irq-affinity.pl
@@ -39,6 +39,19 @@ if ($mask eq 'auto') {
 
 exit 0;
 
+# Test if device is in up by reading /sys/class/net/ethX/flags
+sub is_up {
+    my $ifname = shift;
+
+    open ( my $f, '<', "/sys/class/net/$ifname/flags" )
+	or return;
+    my $flags = <$f>;
+    chomp $flags;
+    close $f;
+
+    return hex($flags) & 1;
+}
+
 # Get current irq assignments by reading /proc/interrupts
 sub irqinfo {
     my $irqmap;
@@ -252,6 +265,8 @@ sub affinity_mask {
     check_mask($ifname, "irq", $irqmsk);
     check_mask($ifname, "rps", $rpsmsk) if $rpsmsk;
 
+    return unless is_up($ifname);
+
     my $irq = get_irq($ifname);
     die "$ifname: attempt to assign affinity to device without irq\n"
 	unless (defined($irq));
@@ -275,6 +290,9 @@ sub affinity_mask {
 #    CPUs available to do that.
 sub affinity_auto {
     my $ifname   = shift;
+
+    return unless is_up($ifname);
+
     my $irqmap = irqinfo();
     my @irqnames = keys %{$irqmap};
 
-- 
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