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virtio: document virtio_config_ops restrictions 

Some transports (e.g. virtio-ccw) implement virtio operations that
seem to be a simple read/write as something more involved that
cannot be done from an atomic context.

Give at least a hint about that.

Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Cornelia Huck 2019-01-03 17:08:04 +01:00 committed by Michael S. Tsirkin
parent b89a07c437
commit d1c1dad89e
1 changed files with 5 additions and 0 deletions
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5
include/linux/virtio_config.h
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@ -12,6 +12,11 @@ struct irq_affinity;
/**
* virtio_config_ops - operations for configuring a virtio device
* Note: Do not assume that a transport implements all of the operations
* getting/setting a value as a simple read/write! Generally speaking,
* any of @get/@set, @get_status/@set_status, or @get_features/
* @finalize_features are NOT safe to be called from an atomic
* context.
* @get: read the value of a configuration field
* vdev: the virtio_device
* offset: the offset of the configuration field