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authorK. Y. Srinivasan <kys@microsoft.com>2012-12-01 06:46:34 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-01-17 10:46:39 -0800
commit7ae3e035195735f9b6ce3308b6240af877a41ea0 (patch)
treea33df83eaf8364a013c6dd98a87ae9463fc9cf9f /drivers/hv
parent132368bd0b286457f83f56d0bbdecd85999562dc (diff)
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 <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/hv_util.c10
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
--- a/drivers/hv/hv_util.c
+++ b/drivers/hv/hv_util.c
@@ -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,
srv->util_cb, dev->channel);
if (ret)

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