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(parent: 9798586) | patch
virtio: expose added descriptors immediately.
authorRusty Russell <rusty@rustcorp.com.au>
Mon, 14 Nov 2011 23:07:38 +0000 (10:07 +1100)
committerStephen Rothwell <sfr@canb.auug.org.au>
Mon, 14 Nov 2011 23:10:07 +0000 (10:10 +1100)
commitcc09929dfe0cacc27d25bca224657f087bdbbec3
treec25dd3a3ac50a1d041a44df0d43849b1148e876btree | snapshot
parent97985861e1e08c8cc82da08ada98b0ea1ebc17b2commit | diff
virtio: expose added descriptors immediately.

A virtio driver does virtqueue_add_buf() multiple times before finally
calling virtqueue_kick(); previously we only exposed the added buffers
in the virtqueue_kick() call.  This means we don't need a memory
barrier in virtqueue_add_buf(), but it reduces concurrency as the
device (ie. host) can't see the buffers until the kick.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
drivers/virtio/virtio_ring.c diff | blob | history
Linux kernel for KaRo TX COM modules