summaryrefslogtreecommitdiffstats
path: root/include/linux/virtio.h
diff options
context:
space:
mode:
authorRussell King <rmk@dyn-67.arm.linux.org.uk>2008-04-19 17:17:29 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-04-19 17:17:29 +0100
commitadf6d34e460387ee3e8f1e1875d52bff51212c7d (patch)
tree88ef100143e6184103a608f82dfd232bf6376eaf /include/linux/virtio.h
parentd1964dab60ce7c104dd21590e987a8787db18051 (diff)
parent3760d31f11bfbd0ead9eaeb8573e0602437a9d7c (diff)
Merge branch 'omap2-upstream' into devel
Diffstat (limited to 'include/linux/virtio.h')
-rw-r--r--include/linux/virtio.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 12c18ac1b97..e7d10845b3c 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -41,6 +41,8 @@ struct virtqueue
* Returns NULL or the "data" token handed to add_buf.
* @disable_cb: disable callbacks
* vq: the struct virtqueue we're talking about.
+ * Note that this is not necessarily synchronous, hence unreliable and only
+ * useful as an optimization.
* @enable_cb: restart callbacks after disable_cb.
* vq: the struct virtqueue we're talking about.
* This re-enables callbacks; it returns "false" if there are pending
@@ -48,7 +50,8 @@ struct virtqueue
* checking for more work, and enabling callbacks.
*
* Locking rules are straightforward: the driver is responsible for
- * locking. No two operations may be invoked simultaneously.
+ * locking. No two operations may be invoked simultaneously, with the exception
+ * of @disable_cb.
*
* All operations can be called in any context.
*/