yinghai at kernel
Aug 10, 2013, 7:48 PM
Post #1 of 1
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[PATCH v4 16/28] xen, irq: Call irq_alloc_reserved_desc_at() at first
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To make x86 irq allocation to be same with booting path and ioapic
hot add path, We will pre-reserve irq for all gsi at first.
We have to use alloc_reserved here, otherwise irq_alloc_desc_at will fail
because bit is already get marked for pre-reserved in irq bitmaps.
Signed-off-by: Yinghai Lu <yinghai [at] kernel>
Cc: Konrad Rzeszutek Wilk <konrad.wilk [at] oracle>
Cc: xen-devel [at] lists
---
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 a58ac43..1a3647c 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -507,8 +507,12 @@ 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_alloc_reserved_desc_at(gsi, -1);
+ if (irq < 0)
+ irq = irq_alloc_desc_at(gsi, -1);
+ }
xen_irq_init(irq);
--
1.8.1.4
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