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vdpasim: allow to enable a vq repeatedly

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commit 242436973831aa97e8ce19533c6c912ea8def31b upstream.

Code must be resilient to enable a queue many times.

At the moment the queue is resetting so it's definitely not the expected
behavior.

v2: set vq->ready = 0 at disable.

Fixes: 2c53d0f64c ("vdpasim: vDPA device simulator")
Cc: stable@vger.kernel.org
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <20220519145919.772896-1-eperezma@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eugenio Pérez 2022-05-19 16:59:19 +02:00 committed by Greg Kroah-Hartman
parent ec029087df
commit 19e5aac38a
1 changed files with 4 additions and 1 deletions
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5
drivers/vdpa/vdpa_sim/vdpa_sim.c
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@ -473,11 +473,14 @@ static void vdpasim_set_vq_ready(struct vdpa_device *vdpa, u16 idx, bool ready)
{
struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
bool old_ready;
spin_lock(&vdpasim->lock);
old_ready = vq->ready;
vq->ready = ready;
if (vq->ready)
if (vq->ready && !old_ready) {
vdpasim_queue_ready(vdpasim, idx);
}
spin_unlock(&vdpasim->lock);
}