linux-kernel - [PATCH 5.17 750/772] vdpasim: allow to enable a vq repeatedly

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Date:   Tue,  7 Jun 2022 19:05:42 +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 5.17 750/772] 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
@@ -353,11 +353,14 @@ 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);
 }