|author||K. Y. Srinivasan <email@example.com>||2012-12-01 06:46:34 -0800|
|committer||Greg Kroah-Hartman <firstname.lastname@example.org>||2013-01-17 10:46:39 -0800|
Drivers: hv: Turn off batched reading for util drivers
Util driver is not a performance critical driver and furthermore some util services such as KVP can only handle one outstanding message from the host. Turn off batched reading for util drivers. Signed-off-by: K. Y. Srinivasan <email@example.com> Reviewed-by: Haiyang Zhang <firstname.lastname@example.org> Signed-off-by: Greg Kroah-Hartman <email@example.com>
Diffstat (limited to 'drivers/hv')
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c
index a0667de7a04c..a62a76062508 100644
@@ -274,6 +274,16 @@ static int util_probe(struct hv_device *dev,
+ * The set of services managed by the util driver are not performance
+ * critical and do not need batched reading. Furthermore, some services
+ * such as KVP can only handle one message from the host at a time.
+ * Turn off batched reading for all util drivers before we open the
+ * channel.
+ set_channel_read_state(dev->channel, false);
ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,