[PATCH v3 13/14] vfio/gvt: Fix open/close when multiple device FDs are open
From: Jason Gunthorpe <jgg@nvidia.com>
Date: 2021-07-29 00:49:52
Also in:
dri-devel, intel-gfx, kvm, linux-s390
Subsystem:
drm drivers, intel drm i915 driver (meteor lake, dg2 and older excluding poulsbo, moorestown and derivative), intel gvt-g drivers (intel gpu virtualization), the rest · Maintainers:
David Airlie, Simona Vetter, Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin, Linus Torvalds
The user can open multiple device FDs if it likes, however the open function calls vfio_register_notifier() on device global state. Calling vfio_register_notifier() twice 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 function over. Reviewed-by: Zhenyu Wang <redacted> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> --- drivers/gpu/drm/i915/gvt/kvmgt.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 1ac98f8aba31e6..7efa386449d104 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c@@ -885,7 +885,7 @@ static int intel_vgpu_group_notifier(struct notifier_block *nb, return NOTIFY_OK; } -static int intel_vgpu_open(struct mdev_device *mdev) +static int intel_vgpu_open_device(struct mdev_device *mdev) { struct intel_vgpu *vgpu = mdev_get_drvdata(mdev); struct kvmgt_vdev *vdev = kvmgt_vdev(vgpu);
@@ -1004,7 +1004,7 @@ static void __intel_vgpu_release(struct intel_vgpu *vgpu) vgpu->handle = 0; } -static void intel_vgpu_release(struct mdev_device *mdev) +static void intel_vgpu_close_device(struct mdev_device *mdev) { struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
@@ -1753,8 +1753,8 @@ static struct mdev_parent_ops intel_vgpu_ops = { .create = intel_vgpu_create, .remove = intel_vgpu_remove, - .open = intel_vgpu_open, - .release = intel_vgpu_release, + .open_device = intel_vgpu_open_device, + .close_device = intel_vgpu_close_device, .read = intel_vgpu_read, .write = intel_vgpu_write,
--
2.32.0