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| author | Daniel Verkamp <dverkamp@chromium.org> | 2020-01-03 10:40:45 -0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2020-02-06 03:40:26 -0500 |
| commit | 303090b513fd1ee45aa1536b71a3838dc054bc05 (patch) | |
| tree | 2b7767288f55fbe821d9eccd7583b13d894892ca /drivers/virtio | |
| parent | 5790b53390e18fdd21e70776e46d058c05eda2f2 (diff) | |
| download | linux-303090b513fd1ee45aa1536b71a3838dc054bc05.tar.gz linux-303090b513fd1ee45aa1536b71a3838dc054bc05.tar.bz2 linux-303090b513fd1ee45aa1536b71a3838dc054bc05.zip | |
virtio-pci: check name when counting MSI-X vectors
VQs without a name specified are not valid; they are skipped in the
later loop that assigns MSI-X vectors to queues, but the per_vq_vectors
loop above that counts the required number of vectors previously still
counted any queue with a non-NULL callback as needing a vector.
Add a check to the per_vq_vectors loop so that vectors with no name are
not counted to make the two loops consistent. This prevents
over-counting unnecessary vectors (e.g. for features which were not
negotiated with the device).
Cc: stable@vger.kernel.org
Fixes: 86a559787e6f ("virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT")
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Daniel Verkamp <dverkamp@chromium.org>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Wang, Wei W <wei.w.wang@intel.com>
Diffstat (limited to 'drivers/virtio')
| -rw-r--r-- | drivers/virtio/virtio_pci_common.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c index f2862f66c2ac..222d630c41fc 100644 --- a/drivers/virtio/virtio_pci_common.c +++ b/drivers/virtio/virtio_pci_common.c @@ -294,7 +294,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs, /* Best option: one for change interrupt, one per vq. */ nvectors = 1; for (i = 0; i < nvqs; ++i) - if (callbacks[i]) + if (names[i] && callbacks[i]) ++nvectors; } else { /* Second best: one for change, shared for all vqs. */ |