qubes-linux-kernel/0004-Log-error-code-of-EVTCHNOP_bind_pirq-failure.patch

From d4a2de0378cb95512e61a6f6af542b92ec4fda76 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?=
 <marmarek@invisiblethingslab.com>
Date: Sat, 30 Jan 2016 01:53:26 +0100
Subject: [PATCH] Log error code of EVTCHNOP_bind_pirq failure

Ease debugging of PCI passthrough problems.
---
 drivers/xen/events/events_base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index 117e76b2f939..34f380be2b34 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -521,7 +521,7 @@ static unsigned int __startup_pirq(unsigned int irq)
 					BIND_PIRQ__WILL_SHARE : 0;
 	rc = HYPERVISOR_event_channel_op(EVTCHNOP_bind_pirq, &bind_pirq);
 	if (rc != 0) {
-		pr_warn("Failed to obtain physical IRQ %d\n", irq);
+		pr_warn("Failed to obtain physical IRQ %d (error %d)\n", irq, rc);
 		return 0;
 	}
 	evtchn = bind_pirq.port;
-- 
2.20.1