linux-kernel - [PATCH] virtio: Don't access device data after unregistration.

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Date:	Mon,  3 Sep 2012 15:50:42 +0200
From:	sjur.brandeland@...ricsson.com
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Sjur Brændeland <sjurbren@...il.com>,
	linux-kernel@...r.kernel.org,
	Sjur Brændeland <sjur.brandeland@...ricsson.com>,
	"Guzman Lugo, Fernadndo" <fernando.lugo@...com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	virtualization@...ts.linux-foundation.org,
	Ohad Ben-Cohen <ohad@...ery.com>
Subject: [PATCH] virtio: Don't access device data after unregistration.

From: Sjur Brændeland <sjur.brandeland@...ricsson.com>

Fix panic in virtio.c when CONFIG_DEBUG_SLAB is set.
Use device_del() and put_device() instead of
device_unregister(), and access device data before
calling put_device().


Signed-off-by: Sjur Brændeland <sjur.brandeland@...ricsson.com>
cc: Guzman Lugo, Fernadndo <fernando.lugo@...com>
cc: Michael S. Tsirkin <mst@...hat.com>
cc: virtualization@...ts.linux-foundation.org
cc: Ohad Ben-Cohen <ohad@...ery.com>
---
 drivers/virtio/virtio.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index c3b3f7f..71eacd1 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -225,8 +225,9 @@ EXPORT_SYMBOL_GPL(register_virtio_device);
 
 void unregister_virtio_device(struct virtio_device *dev)
 {
-	device_unregister(&dev->dev);
+	device_del(&dev->dev);
 	ida_simple_remove(&virtio_index_ida, dev->index);
+	put_device(&dev->dev);
 }
 EXPORT_SYMBOL_GPL(unregister_virtio_device);
 
-- 
1.7.5.4

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