linux-kernel - [PATCH v2 15/26] xen, irq: call irq_realloc_desc

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Date:	Fri,  8 Feb 2013 11:28:12 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	xen-devel@...ts.xensource.com
Subject: [PATCH v2 15/26] xen, irq: call irq_realloc_desc_at() at first

We will pre-reserve irq for all gsi at first for x86, so we have to
use realloc with it.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: xen-devel@...ts.xensource.com
---
 drivers/xen/events.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 0be4df3..dda38db 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -482,8 +482,12 @@ static int __must_check xen_allocate_irq_gsi(unsigned gsi)
 	/* Legacy IRQ descriptors are already allocated by the arch. */
 	if (gsi < NR_IRQS_LEGACY)
 		irq = gsi;
-	else
-		irq = irq_alloc_desc_at(gsi, -1);
+	else {
+		/* for x86, irq already get reserved for gsi */
+		irq = irq_realloc_desc_at(gsi, -1);
+		if (irq < 0)
+			irq = irq_alloc_desc_at(gsi, -1);
+	}
 
 	xen_irq_init(irq);
 
-- 
1.7.10.4

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