[PATCH v4 11/14] vfio/mbochs: Fix close when multiple device FDs are open

Jason Gunthorpe
2021-08-06T01:19:19Z

mbochs_close() iterates over global device state and frees it. Currently
this is done every time a device FD is closed, but if multiple device FDs
are open this could corrupt other still active FDs.

Change this to use close_device() so it only runs on the last close.

Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
samples/vfio-mdev/mbochs.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
index 7b2e12fe70827c..c313ab4d1f4e4e 100644
--- a/samples/vfio-mdev/mbochs.c
+++ b/samples/vfio-mdev/mbochs.c
@@ -1278,7 +1278,7 @@ static long mbochs_ioctl(struct vfio_device *vdev, unsigned int cmd,
return -ENOTTY;
}

-static void mbochs_close(struct vfio_device *vdev)
+static void mbochs_close_device(struct vfio_device *vdev)
{
struct mdev_state *mdev_state =
container_of(vdev, struct mdev_state, vdev);
@@ -1396,7 +1396,7 @@ static struct attribute_group *mdev_type_groups[] = {
};

static const struct vfio_device_ops mbochs_dev_ops = {
- .release = mbochs_close,
+ .close_device = mbochs_close_device,
.read = mbochs_read,
.write = mbochs_write,
.ioctl = mbochs_ioctl,
--
2.32.0