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Message-Id: <20220607164921.190090347@linuxfoundation.org>
Date: Tue, 7 Jun 2022 19:04:41 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Eugenio Pérez <eperezma@...hat.com>,
"Michael S. Tsirkin" <mst@...hat.com>,
Stefano Garzarella <sgarzare@...hat.com>
Subject: [PATCH 5.10 424/452] vdpasim: allow to enable a vq repeatedly
From: Eugenio Pérez <eperezma@...hat.com>
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: 2c53d0f64c06 ("vdpasim: vDPA device simulator")
Cc: stable@...r.kernel.org
Signed-off-by: Eugenio Pérez <eperezma@...hat.com>
Message-Id: <20220519145919.772896-1-eperezma@...hat.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/vdpa/vdpa_sim/vdpa_sim.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -473,11 +473,14 @@ static void vdpasim_set_vq_ready(struct
{
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);
}
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