linux-kernel - [PATCH V2] xen: clear IRQ_NOAUTOEN and IRQ

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Date:	Tue, 30 Apr 2013 18:29:13 +0100
From:	Julien Grall <julien.grall@...aro.org>
To:	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org
Cc:	konrad.wilk@...cle.com, Stefano.Stabellini@...citrix.com,
	patches@...aro.org, Julien Grall <julien.grall@...aro.org>
Subject: [PATCH V2] xen: clear IRQ_NOAUTOEN and IRQ_NOREQUEST

Reset the IRQ_NOAUTOEN and IRQ_NOREQUEST flags that are enabled by
default on ARM. If IRQ_NOAUTOEN is set, __setup_irq doesn't call
irq_startup, that is responsible for calling irq_unmask at startup time.
As a result event channels remain masked.

The clear is already made in bind_evtchn_to_irq with commit a8636c0 but was
missing on all others bind_*_to_irq. Move the clear in xen_irq_info_common_init.

On x86, IRQ_NOAUTOEN and IRQ_NOREQUEST are cleared by default, so this commit
doesn't impact this architecture.

Signed-off-by: Julien Grall <julien.grall@...aro.org>
---
 Changes since v1:
   - Specify this commit will not impact x86 in the comment
   - Clear flag directly in xen_irq_info_common_init, this function is
   called by all bind_*_to_irq

 drivers/xen/events.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index d8cc812..6a6bbe4 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -167,6 +167,8 @@ static void xen_irq_info_common_init(struct irq_info *info,
 	info->cpu = cpu;
 
 	evtchn_to_irq[evtchn] = irq;
+
+	irq_clear_status_flags(irq, IRQ_NOREQUEST|IRQ_NOAUTOEN);
 }
 
 static void xen_irq_info_evtchn_init(unsigned irq,
@@ -874,7 +876,6 @@ int bind_evtchn_to_irq(unsigned int evtchn)
 		struct irq_info *info = info_for_irq(irq);
 		WARN_ON(info == NULL || info->type != IRQT_EVTCHN);
 	}
-	irq_clear_status_flags(irq, IRQ_NOREQUEST|IRQ_NOAUTOEN);
 
 out:
 	mutex_unlock(&irq_mapping_update_lock);
-- 
1.7.10.4

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