linux-kernel - FAILED: Patch "virtio: reenable config if freezing device failed" failed to apply to 5.15-stable tree

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Message-ID: <20240327121550.2832232-1-sashal@kernel.org>
Date: Wed, 27 Mar 2024 08:15:50 -0400
From: Sasha Levin <sashal@...nel.org>
To: stable@...r.kernel.org,
	david@...hat.com
Cc: stable@...nel.org,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	virtualization@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: FAILED: Patch "virtio: reenable config if freezing device failed" failed to apply to 5.15-stable tree

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@...r.kernel.org>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

>From 310227f42882c52356b523e2f4e11690eebcd2ab Mon Sep 17 00:00:00 2001
From: David Hildenbrand <david@...hat.com>
Date: Tue, 13 Feb 2024 14:54:25 +0100
Subject: [PATCH] virtio: reenable config if freezing device failed

Currently, we don't reenable the config if freezing the device failed.

For example, virtio-mem currently doesn't support suspend+resume, and
trying to freeze the device will always fail. Afterwards, the device
will no longer respond to resize requests, because it won't get notified
about config changes.

Let's fix this by re-enabling the config if freezing fails.

Fixes: 22b7050a024d ("virtio: defer config changed notifications")
Cc: <stable@...nel.org>
Cc: "Michael S. Tsirkin" <mst@...hat.com>
Cc: Jason Wang <jasowang@...hat.com>
Cc: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Signed-off-by: David Hildenbrand <david@...hat.com>
Message-Id: <20240213135425.795001-1-david@...hat.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 drivers/virtio/virtio.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index f4080692b3513..f513ee21b1c18 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -510,8 +510,10 @@ int virtio_device_freeze(struct virtio_device *dev)
 
 	if (drv && drv->freeze) {
 		ret = drv->freeze(dev);
-		if (ret)
+		if (ret) {
+			virtio_config_enable(dev);
 			return ret;
+		}
 	}
 
 	if (dev->config->destroy_avq)
-- 
2.43.0