Re: [PATCH v3 3/6] virtio: allow finalize_features to fail
From: Cornelia Huck <hidden>
Date: 2014-12-09 10:47:14
Also in:
linux-s390, lkml
Subsystem:
s390 architecture, the rest · Maintainers:
Heiko Carstens, Vasily Gorbik, Alexander Gordeev, Linus Torvalds
Possibly related (same subject, not in this thread)
- 2014-12-08 · [PATCH v3 3/6] virtio: allow finalize_features to fail · "Michael S. Tsirkin" <mst@redhat.com>
On Mon, 8 Dec 2014 15:05:58 +0200 "Michael S. Tsirkin" [off-list ref] wrote:
This will make it easy for transports to validate features and return failure. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> --- include/linux/virtio_config.h | 3 ++- drivers/lguest/lguest_device.c | 4 +++- drivers/misc/mic/card/mic_virtio.c | 4 +++- drivers/remoteproc/remoteproc_virtio.c | 4 +++- drivers/s390/kvm/kvm_virtio.c | 4 +++- drivers/s390/kvm/virtio_ccw.c | 6 ++++-- drivers/virtio/virtio.c | 21 ++++++++++++++------- drivers/virtio/virtio_mmio.c | 4 +++- drivers/virtio/virtio_pci.c | 4 +++- 9 files changed, 38 insertions(+), 16 deletions(-)
quoted hunk
diff --git a/drivers/s390/kvm/virtio_ccw.c b/drivers/s390/kvm/virtio_ccw.c index c792b5f..789275f 100644 --- a/drivers/s390/kvm/virtio_ccw.c +++ b/drivers/s390/kvm/virtio_ccw.c@@ -752,7 +752,7 @@ out_free: return rc; } -static void virtio_ccw_finalize_features(struct virtio_device *vdev) +static int virtio_ccw_finalize_features(struct virtio_device *vdev) { struct virtio_ccw_device *vcdev = to_vc_device(vdev); struct virtio_feature_desc *features;@@ -760,7 +760,7 @@ static void virtio_ccw_finalize_features(struct virtio_device *vdev) ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); if (!ccw) - return; + return 0;
I think we'll want to return an error in this case as well to fail probing. Also for the other places where something can go wrong. Something like this:
diff --git a/drivers/s390/kvm/virtio_ccw.c b/drivers/s390/kvm/virtio_ccw.c
index 789275f..bc6e671 100644
--- a/drivers/s390/kvm/virtio_ccw.c
+++ b/drivers/s390/kvm/virtio_ccw.c@@ -757,15 +757,17 @@ 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; 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);
@@ -776,7 +778,9 @@ 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;
@@ -788,13 +792,13 @@ 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,