Re: [PATCH] vdpasim: allow to enable a vq repeatedly

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, May 19, 2022 at 04:31:45PM +0200, Eugenio Pérez wrote:
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.

Fixes: 2c53d0f64c06 ("vdpasim: vDPA device simulator")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Eugenio Pérez <eperezma@xxxxxxxxxx>
---
drivers/vdpa/vdpa_sim/vdpa_sim.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index ddbe142af09a..b53cd00ad161 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -355,9 +355,10 @@ static void vdpasim_set_vq_ready(struct vdpa_device *vdpa, u16 idx, bool ready)
	struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];

	spin_lock(&vdpasim->lock);
-	vq->ready = ready;
-	if (vq->ready)
+	if (!vq->ready) {
+		vq->ready = ready;
		vdpasim_queue_ready(vdpasim, idx);
+	}

But this way the first time vq->ready is set to true, then it will never be set back to false.

Should we leave the assignment out of the block?
Maybe after the if block to avoid the problem we are fixing.

Thanks,
Stefano




[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]

  Powered by Linux