[Intel-gfx] [PATCH v2 12/14] vfio/ap, ccw: Fix open/close when multiple device FDs are open

Jason Gunthorpe
2021-07-20T17:43:33Z

The user can open multiple device FDs if it likes, however these open()
functions call vfio_register_notifier() on some device global
state. Calling vfio_register_notifier() twice in will trigger a WARN_ON
from notifier_chain_register() and the first close will wrongly delete the
notifier and more.

Since these really want the new open/close_device() semantics just change
the functions over.

Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
drivers/s390/cio/vfio_ccw_ops.c | 8 ++++----
drivers/s390/crypto/vfio_ap_ops.c | 8 ++++----
2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index c57d2a7f091975..7f540ad0b568bc 100644
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -159,7 +159,7 @@ static int vfio_ccw_mdev_remove(struct mdev_device *mdev)
return 0;
}

-static int vfio_ccw_mdev_open(struct mdev_device *mdev)
+static int vfio_ccw_mdev_open_device(struct mdev_device *mdev)
{
struct vfio_ccw_private *private =
dev_get_drvdata(mdev_parent_dev(mdev));
@@ -194,7 +194,7 @@ static int vfio_ccw_mdev_open(struct mdev_device *mdev)
return ret;
}

-static void vfio_ccw_mdev_release(struct mdev_device *mdev)
+static void vfio_ccw_mdev_close_device(struct mdev_device *mdev)
{
struct vfio_ccw_private *private =
dev_get_drvdata(mdev_parent_dev(mdev));
@@ -638,8 +638,8 @@ static const struct mdev_parent_ops vfio_ccw_mdev_ops = {
.supported_type_groups = mdev_type_groups,
.create = vfio_ccw_mdev_create,
.remove = vfio_ccw_mdev_remove,
- .open = vfio_ccw_mdev_open,
- .release = vfio_ccw_mdev_release,
+ .open_device = vfio_ccw_mdev_open_device,
+ .close_device = vfio_ccw_mdev_close_device,
.read = vfio_ccw_mdev_read,
.write = vfio_ccw_mdev_write,
.ioctl = vfio_ccw_mdev_ioctl,
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 122c85c224695e..cee5626fe0a4ef 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -1315,7 +1315,7 @@ static int vfio_ap_mdev_reset_queues(struct mdev_device *mdev)
return rc;
}

-static int vfio_ap_mdev_open(struct mdev_device *mdev)
+static int vfio_ap_mdev_open_device(struct mdev_device *mdev)
{
struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
unsigned long events;
@@ -1348,7 +1348,7 @@ static int vfio_ap_mdev_open(struct mdev_device *mdev)
return ret;
}

-static void vfio_ap_mdev_release(struct mdev_device *mdev)
+static void vfio_ap_mdev_close_device(struct mdev_device *mdev)
{
struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);

@@ -1427,8 +1427,8 @@ static const struct mdev_parent_ops vfio_ap_matrix_ops = {
.mdev_attr_groups = vfio_ap_mdev_attr_groups,
.create = vfio_ap_mdev_create,
.remove = vfio_ap_mdev_remove,
- .open = vfio_ap_mdev_open,
- .release = vfio_ap_mdev_release,
+ .open_device = vfio_ap_mdev_open_device,
+ .close_device = vfio_ap_mdev_close_device,
.ioctl = vfio_ap_mdev_ioctl,
};

--
2.32.0