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| author | David S. Miller <davem@davemloft.net> | 2008-09-09 01:59:05 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-09-09 01:59:05 +0200 |
| commit | 17dce5dfe38ae2fb359b61e855f5d8a3a8b7892b (patch) | |
| tree | 88bb1fcf84f9ebfa4299c9a8dcd9e6330b358446 /drivers/lguest/lguest_device.c | |
| parent | netns bridge: cleanup bridges during netns stop (diff) | |
| parent | Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/hskinn... (diff) | |
| download | linux-17dce5dfe38ae2fb359b61e855f5d8a3a8b7892b.tar.xz linux-17dce5dfe38ae2fb359b61e855f5d8a3a8b7892b.zip | |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
Conflicts:
net/mac80211/mlme.c
Diffstat (limited to 'drivers/lguest/lguest_device.c')
| -rw-r--r-- | drivers/lguest/lguest_device.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c index 37344aaee22f..a661bbdae3d6 100644 --- a/drivers/lguest/lguest_device.c +++ b/drivers/lguest/lguest_device.c @@ -98,6 +98,10 @@ static u32 lg_get_features(struct virtio_device *vdev) return features; } +/* The virtio core takes the features the Host offers, and copies the + * ones supported by the driver into the vdev->features array. Once + * that's all sorted out, this routine is called so we can tell the + * Host which features we understand and accept. */ static void lg_finalize_features(struct virtio_device *vdev) { unsigned int i, bits; @@ -108,6 +112,10 @@ static void lg_finalize_features(struct virtio_device *vdev) /* Give virtio_ring a chance to accept features. */ vring_transport_features(vdev); + /* The vdev->feature array is a Linux bitmask: this isn't the + * same as a the simple array of bits used by lguest devices + * for features. So we do this slow, manual conversion which is + * completely general. */ memset(out_features, 0, desc->feature_len); bits = min_t(unsigned, desc->feature_len, sizeof(vdev->features)) * 8; for (i = 0; i < bits; i++) { |