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virtio_ring: Fix error reporting in virtqueue_resize

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[ Upstream commit 45ebc7e6c1 ]

The virtqueue_resize() function was not correctly propagating error codes
from its internal resize helper functions, specifically
virtqueue_resize_packet() and virtqueue_resize_split(). If these helpers
returned an error, but the subsequent call to virtqueue_enable_after_reset()
succeeded, the original error from the resize operation would be masked.
Consequently, virtqueue_resize() could incorrectly report success to its
caller despite an underlying resize failure.

This change restores the original code behavior:

       if (vdev->config->enable_vq_after_reset(_vq))
               return -EBUSY;

       return err;

Fix: commit ad48d53b5b ("virtio_ring: separate the logic of reset/enable from virtqueue_resize")
Cc: xuanzhuo@linux.alibaba.com
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Link: https://patch.msgid.link/20250521092236.661410-2-lvivier@redhat.com
Tested-by: Lei Yang <leiyang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Laurent Vivier 2025-05-21 11:22:34 +02:00 committed by Greg Kroah-Hartman
parent fa53beab47
commit 0e8c65939b
1 changed files with 6 additions and 2 deletions
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8
drivers/virtio/virtio_ring.c
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@ -2739,7 +2739,7 @@ int virtqueue_resize(struct virtqueue *_vq, u32 num,
void (*recycle)(struct virtqueue *vq, void *buf))
{
struct vring_virtqueue *vq = to_vvq(_vq);
int err;
int err, err_reset;
if (num > vq->vq.num_max)
return -E2BIG;
@ -2759,7 +2759,11 @@ int virtqueue_resize(struct virtqueue *_vq, u32 num,
else
err = virtqueue_resize_split(_vq, num);
return virtqueue_enable_after_reset(_vq);
err_reset = virtqueue_enable_after_reset(_vq);
if (err_reset)
return err_reset;
return err;
}
EXPORT_SYMBOL_GPL(virtqueue_resize);