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virtio_config: Add virtio_config_val_len()

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This patch adds virtio_config_val_len() which allows retrieving variable
length data from the virtio config space only if a specific feature is on.

Cc: Amit Shah <amit.shah@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: virtualization@lists.linux-foundation.org
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Sasha Levin 2011-08-14 17:52:32 +03:00 committed by Rusty Russell
parent 51c6d61ac5
commit 3ead6f4d42
1 changed files with 3 additions and 0 deletions
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3
include/linux/virtio_config.h
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@ -155,6 +155,9 @@ static inline bool virtio_has_feature(const struct virtio_device *vdev,
#define virtio_config_val(vdev, fbit, offset, v) \
virtio_config_buf((vdev), (fbit), (offset), (v), sizeof(*v))
#define virtio_config_val_len(vdev, fbit, offset, v, len) \
virtio_config_buf((vdev), (fbit), (offset), (v), (len))
static inline int virtio_config_buf(struct virtio_device *vdev,
unsigned int fbit,
unsigned int offset,