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vduse: Use proper spinlock for IRQ injection 

[ Upstream commit 7ca26efb09 ]

The IRQ injection work used spin_lock_irq() to protect the
scheduling of the softirq, but spin_lock_bh() should be
used.

With spin_lock_irq(), we noticed delay of more than 6
seconds between the time a NAPI polling work is scheduled
and the time it is executed.

Fixes: c8a6153b6c ("vduse: Introduce VDUSE - vDPA Device in Userspace")
Cc: xieyongji@bytedance.com

Suggested-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Message-Id: <20230705114505.63274-1-maxime.coquelin@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Xie Yongji <xieyongji@bytedance.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Maxime Coquelin 2023-07-05 13:45:05 +02:00 committed by Greg Kroah-Hartman
parent af5818c351
commit e706675bee
1 changed files with 4 additions and 4 deletions
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8
drivers/vdpa/vdpa_user/vduse_dev.c
View File

@ -899,10 +899,10 @@ static void vduse_dev_irq_inject(struct work_struct *work)
{
struct vduse_dev *dev = container_of(work, struct vduse_dev, inject);
spin_lock_irq(&dev->irq_lock);
spin_lock_bh(&dev->irq_lock);
if (dev->config_cb.callback)
dev->config_cb.callback(dev->config_cb.private);
spin_unlock_irq(&dev->irq_lock);
spin_unlock_bh(&dev->irq_lock);
}
static void vduse_vq_irq_inject(struct work_struct *work)
@ -910,10 +910,10 @@ static void vduse_vq_irq_inject(struct work_struct *work)
struct vduse_virtqueue *vq = container_of(work,
struct vduse_virtqueue, inject);
spin_lock_irq(&vq->irq_lock);
spin_lock_bh(&vq->irq_lock);
if (vq->ready && vq->cb.callback)
vq->cb.callback(vq->cb.private);
spin_unlock_irq(&vq->irq_lock);
spin_unlock_bh(&vq->irq_lock);
}
static int vduse_dev_queue_irq_work(struct vduse_dev *dev,