linux-kernel - [PATCH] VFIO: platform: clear IRQ_NOAUTOEN when de-assigning the IRQ

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Message-Id: <1444836776-2364-1-git-send-email-eric.auger@linaro.org>
Date:	Wed, 14 Oct 2015 15:32:56 +0000
From:	Eric Auger <eric.auger@...aro.org>
To:	eric.auger@...com, eric.auger@...aro.org,
	alex.williamson@...hat.com, b.reynal@...tualopensystems.com,
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
	kvm@...r.kernel.org
Cc:	suravee.suthikulpanit@....com, thomas.lendacky@....com,
	christoffer.dall@...aro.org, linux-kernel@...r.kernel.org,
	patches@...aro.org
Subject: [PATCH] VFIO: platform: clear IRQ_NOAUTOEN when de-assigning the IRQ

The vfio platform driver currently sets the IRQ_NOAUTOEN before
doing the request_irq to properly handle the user masking. However
it does not clear it when de-assigning the IRQ. This brings issues
when loading the native driver again which may not explicitly enable
the IRQ. This problem was observed with xgbe driver.

Signed-off-by: Eric Auger <eric.auger@...aro.org>
---
 drivers/vfio/platform/vfio_platform_irq.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/vfio/platform/vfio_platform_irq.c b/drivers/vfio/platform/vfio_platform_irq.c
index 88bba57..46d4750 100644
--- a/drivers/vfio/platform/vfio_platform_irq.c
+++ b/drivers/vfio/platform/vfio_platform_irq.c
@@ -185,6 +185,7 @@ static int vfio_set_trigger(struct vfio_platform_device *vdev, int index,
 	int ret;
 
 	if (irq->trigger) {
+		irq_clear_status_flags(irq->hwirq, IRQ_NOAUTOEN);
 		free_irq(irq->hwirq, irq);
 		kfree(irq->name);
 		eventfd_ctx_put(irq->trigger);
-- 
1.9.1

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