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| author | Michael S. Tsirkin <mst@redhat.com> | 2015-01-04 17:28:27 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2015-01-06 16:35:36 +0200 |
| commit | a1eb03f546d651a8f39c7d0692b1f7f5b4e7e3cd (patch) | |
| tree | 5c13bec69e729fef992d61b9acaa0710aac6f6b7 /drivers/virtio | |
| parent | 63bd62a08ca45a0c804c3c89777edc7f76a2d6da (diff) | |
| download | lwn-a1eb03f546d651a8f39c7d0692b1f7f5b4e7e3cd.tar.gz lwn-a1eb03f546d651a8f39c7d0692b1f7f5b4e7e3cd.zip | |
virtio_pci: document why we defer kfree
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.
Cc: stable@vger.kernel.org
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/virtio')
| -rw-r--r-- | drivers/virtio/virtio_pci_legacy.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_pci_legacy.c b/drivers/virtio/virtio_pci_legacy.c index 4beaee384906..a5486e65e04b 100644 --- a/drivers/virtio/virtio_pci_legacy.c +++ b/drivers/virtio/virtio_pci_legacy.c @@ -216,6 +216,9 @@ static void virtio_pci_release_dev(struct device *_d) 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); } |