Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()

Commit a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in
hv_need_to_signal_on_read()")
added the proper mb(), but removed the test "prev_write_sz < pending_sz"
when making the signal decision.

As a result, the guest can signal the host unnecessarily,
and then the host can throttle the guest because the host
thinks the guest is buggy or malicious; finally the user
running stress test can perceive intermittent freeze of
the guest.

This patch brings back the test, and properly handles the
in-place consumption APIs used by NetVSC (see get_next_pkt_raw(),
put_pkt_raw() and commit_rd_index()).

Fixes: a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in
hv_need_to_signal_on_read()")

Signed-off-by: Dexuan Cui <decui@microsoft.com>
Reported-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
Tested-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

path: root/include/dt-bindings/clock/clps711x-clock.h

/*
 * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#ifndef __DT_BINDINGS_CLOCK_CLPS711X_H
#define __DT_BINDINGS_CLOCK_CLPS711X_H

#define CLPS711X_CLK_DUMMY	0
#define CLPS711X_CLK_CPU	1
#define CLPS711X_CLK_BUS	2
#define CLPS711X_CLK_PLL	3
#define CLPS711X_CLK_TIMERREF	4
#define CLPS711X_CLK_TIMER1	5
#define CLPS711X_CLK_TIMER2	6
#define CLPS711X_CLK_PWM	7
#define CLPS711X_CLK_SPIREF	8
#define CLPS711X_CLK_SPI	9
#define CLPS711X_CLK_UART	10
#define CLPS711X_CLK_TICK	11
#define CLPS711X_CLK_MAX	12

#endif