| From | Ben Hutchings <> | Date | Tue, 17 Feb 2015 01:46:53 +0000 | Subject | [PATCH 3.2 084/152] virtio_pci: document why we defer kfree |
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3.2.67-rc1 review patch. If anyone has any objections, please let me know.
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From: "Michael S. Tsirkin" <mst@redhat.com>
commit a1eb03f546d651a8f39c7d0692b1f7f5b4e7e3cd upstream.
The reason we defer kfree until release function is because it's a general rule for kobjects: kfree of the reference counter itself is only legal in the release function.
Previous patch didn't make this clear, document this in code.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com> [bwh: Backported to 3.2: adjust filename] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- drivers/virtio/virtio_pci.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/virtio/virtio_pci.c +++ b/drivers/virtio/virtio_pci.c @@ -615,6 +615,9 @@ static void virtio_pci_release_dev(struc struct virtio_device *vdev = dev_to_virtio(_d); struct virtio_pci_device *vp_dev = to_vp_device(vdev); + /* As struct device is a kobject, it's not safe to + * free the memory (including the reference counter itself) + * until it's release callback. */ kfree(vp_dev); }
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