diff options
| author | Michael S. Tsirkin <mst@redhat.com> | 2014-10-23 18:40:30 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2014-12-09 12:05:27 +0200 |
| commit | 485551366d56c752fcd9aaac0544b9f057226ad6 (patch) | |
| tree | e848f3e1f286bc2706ea12a1c1c960cfd517a03a | |
| parent | d4674240f31f8c4289abba07d64291c6ddce51bc (diff) | |
KVM: s390 allow virtio_ccw status writes to fail
Gracefully handle failure to write device status.
We really should handle other errors as well, but this one is needed for
virtio 1.0 compliance.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
| -rw-r--r-- | drivers/s390/kvm/virtio_ccw.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/s390/kvm/virtio_ccw.c b/drivers/s390/kvm/virtio_ccw.c index 1c21c08f33be..45ab269d70db 100644 --- a/drivers/s390/kvm/virtio_ccw.c +++ b/drivers/s390/kvm/virtio_ccw.c @@ -862,7 +862,9 @@ static u8 virtio_ccw_get_status(struct virtio_device *vdev) static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) { struct virtio_ccw_device *vcdev = to_vc_device(vdev); + u8 old_status = *vcdev->status; struct ccw1 *ccw; + int ret; ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); if (!ccw) @@ -874,7 +876,10 @@ static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) ccw->flags = 0; ccw->count = sizeof(status); ccw->cda = (__u32)(unsigned long)vcdev->status; - ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); + ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); + /* Write failed? We assume status is unchanged. */ + if (ret) + *vcdev->status = old_status; kfree(ccw); } |