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Subject[PATCH 2/2] virtio_ccw: finalize_features error handling
From: Cornelia Huck <cornelia.huck@de.ibm.com>

We previously tried to use device even if finalize_features failed, but
that's wrong since driver and device are now out of sync.

Fail probe if we detect failures during finalize_features.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
drivers/s390/kvm/virtio_ccw.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/s390/kvm/virtio_ccw.c b/drivers/s390/kvm/virtio_ccw.c
index f92b9e6..71d7802 100644
--- a/drivers/s390/kvm/virtio_ccw.c
+++ b/drivers/s390/kvm/virtio_ccw.c
@@ -757,6 +757,7 @@ static int virtio_ccw_finalize_features(struct virtio_device *vdev)
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
struct virtio_feature_desc *features;
struct ccw1 *ccw;
+ int ret;

if (vcdev->revision >= 1 &&
!__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
@@ -767,12 +768,13 @@ static int virtio_ccw_finalize_features(struct virtio_device *vdev)

ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
if (!ccw)
- return 0;
+ return -ENOMEM;

features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
- if (!features)
+ if (!features) {
+ ret = -ENOMEM;
goto out_free;
-
+ }
/* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev);

@@ -783,7 +785,9 @@ static int virtio_ccw_finalize_features(struct virtio_device *vdev)
ccw->flags = 0;
ccw->count = sizeof(*features);
ccw->cda = (__u32)(unsigned long)features;
- ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
+ ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
+ if (ret)
+ goto out_free;

if (vcdev->revision == 0)
goto out_free;
@@ -795,13 +799,13 @@ static int virtio_ccw_finalize_features(struct virtio_device *vdev)
ccw->flags = 0;
ccw->count = sizeof(*features);
ccw->cda = (__u32)(unsigned long)features;
- ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
+ ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);

out_free:
kfree(features);
kfree(ccw);

- return 0;
+ return ret;
}

static void virtio_ccw_get_config(struct virtio_device *vdev,
--
MST


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