linux-kernel - [PATCH 3.13 064/198] mei: me: drop harmful wait optimization

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Message-Id: <1405459868-15089-65-git-send-email-kamal@canonical.com>
Date:	Tue, 15 Jul 2014 14:28:54 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Tomas Winkler <tomas.winkler@...el.com>,
	Alexander Usyskin <alexander.usyskin@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 064/198] mei: me: drop harmful wait optimization

3.13.11.5 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tomas Winkler <tomas.winkler@...el.com>

commit 07cd7be3d92eeeae1f92a017f2cfe4fdd9256526 upstream.

It my take time till ME_RDY will be cleared after the reset,
so we cannot check the bit before we got the interrupt

Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/misc/mei/hw-me.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
index f285dc1..4835edc 100644
--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -186,6 +186,7 @@ static int mei_me_hw_reset(struct mei_device *dev, bool intr_enable)
 	else
 		hcsr &= ~H_IE;
 
+	dev->recvd_hw_ready = false;
 	mei_me_reg_write(hw, H_CSR, hcsr);
 
 	if (dev->dev_state == MEI_DEV_POWER_DOWN)
@@ -237,10 +238,7 @@ static bool mei_me_hw_is_ready(struct mei_device *dev)
 static int mei_me_hw_ready_wait(struct mei_device *dev)
 {
 	int err;
-	if (mei_me_hw_is_ready(dev))
-		return 0;
 
-	dev->recvd_hw_ready = false;
 	mutex_unlock(&dev->device_lock);
 	err = wait_event_interruptible_timeout(dev->wait_hw_ready,
 			dev->recvd_hw_ready,
-- 
1.9.1

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