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    Subject[PATCH 5.17 033/158] vhost_vdpa: dont setup irq offloading when irq_num < 0
    Date
    From: Zhu Lingshan <lingshan.zhu@intel.com>

    [ Upstream commit cce0ab2b2a39072d81f98017f7b076f3410ef740 ]

    When irq number is negative(e.g., -EINVAL), the virtqueue
    may be disabled or the virtqueues are sharing a device irq.
    In such case, we should not setup irq offloading for a virtqueue.

    Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
    Link: https://lore.kernel.org/r/20220222115428.998334-3-lingshan.zhu@intel.com
    Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/vhost/vdpa.c | 5 ++++-
    1 file changed, 4 insertions(+), 1 deletion(-)

    diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
    index ec5249e8c32d..05f5fd2af58f 100644
    --- a/drivers/vhost/vdpa.c
    +++ b/drivers/vhost/vdpa.c
    @@ -97,8 +97,11 @@ static void vhost_vdpa_setup_vq_irq(struct vhost_vdpa *v, u16 qid)
    return;

    irq = ops->get_vq_irq(vdpa, qid);
    + if (irq < 0)
    + return;
    +
    irq_bypass_unregister_producer(&vq->call_ctx.producer);
    - if (!vq->call_ctx.ctx || irq < 0)
    + if (!vq->call_ctx.ctx)
    return;

    vq->call_ctx.producer.token = vq->call_ctx.ctx;
    --
    2.35.1


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