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Commit 7ae3e035 authored Dec 01, 2012 by K. Y. Srinivasan Committed by Greg Kroah-Hartman Jan 17, 2013

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>

parent 132368bd

drivers/hv/hv_util.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -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)