From: Haiyang Zhang <haiyangz@microsoft.com>
Date: Fri, 27 Mar 2015 16:10:14 +0000 (-0700)
Subject: hv_vmbus: Add gradually increased delay for retries in vmbus_post_msg()
X-Git-Tag: omap-for-v4.1/fixes-rc1~73^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e1c0d82dab4a4605d3bd1968436f030dfed4a829;p=pandora-kernel.git

hv_vmbus: Add gradually increased delay for retries in vmbus_post_msg()

Most of the retries can be done within a millisecond successfully, so we
sleep 1ms before the first retry, then gradually increase the retry
interval to 2^n with max value of 2048ms. Doing so, we will have shorter
overall delay time, because most of the cases succeed within 1-2 attempts.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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