linux-kernel - [PATCH] x86/apic: do not clear nr_irqs

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Message-Id: <1277755793-15551-1-git-send-email-jacob.jun.pan@linux.intel.com>
Date:	Mon, 28 Jun 2010 13:09:53 -0700
From:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH] x86/apic: do not clear nr_irqs_gsi if no legacy irqs

nr_legacy_irqs is set in probe_nr_irqs_gsi, we should not clear it after that.
Otherwise, the result is that MSI irqs will be allocated from the wrong range
for the systems without legacy PIC.

Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
 arch/x86/kernel/apic/io_apic.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index d99388a..5592462 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -155,10 +155,8 @@ int __init arch_early_irq_init(void)
 	int node;
 	int i;
 
-	if (!legacy_pic->nr_legacy_irqs) {
-		nr_irqs_gsi = 0;
+	if (!legacy_pic->nr_legacy_irqs)
 		io_apic_irqs = ~0UL;
-	}
 
 	cfg = irq_cfgx;
 	count = ARRAY_SIZE(irq_cfgx);
-- 
1.6.3.3

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