[Xen-devel] [PATCH 2/4] xen: use the pirq number to check the pirq_eoi_map

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

In pirq_check_eoi_map use the pirq number rather than the Linux irq
number to check whether an eoi is needed in the pirq_eoi_map.

The reason is that the irq number is not always identical to the
pirq number so if we wrongly use the irq number to check the
pirq_eoi_map we are going to check for the wrong pirq to EOI.

As a consequence some interrupts might not be EOI'ed by the
guest correctly.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Tested-by: Tobias Geiger <tobias.geiger@xxxxxxxxx>
[v1: Added some extra wording to git commit]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 drivers/xen/events.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 4b33acd..0a8a17c 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -274,7 +274,7 @@ static unsigned int cpu_from_evtchn(unsigned int evtchn)
 
 static bool pirq_check_eoi_map(unsigned irq)
 {
-       return test_bit(irq, pirq_eoi_map);
+       return test_bit(pirq_from_irq(irq), pirq_eoi_map);
 }
 
 static bool pirq_needs_eoi_flag(unsigned irq)
-- 
1.7.7.5


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