linux-kernel - [char-misc-next 09/27] mei: amthif: allow only one request at a time

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Date:	Sun,  7 Feb 2016 23:35:25 +0200
From:	Tomas Winkler <tomas.winkler@...el.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Alexander Usyskin <alexander.usyskin@...el.com>,
	linux-kernel@...r.kernel.org,
	Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next 09/27] mei: amthif: allow only one request at a time

From: Alexander Usyskin <alexander.usyskin@...el.com>

A next amthif write can be executed only after the previous one has
completed.

Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
 drivers/misc/mei/amthif.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/misc/mei/amthif.c b/drivers/misc/mei/amthif.c
index 647edc68884f..4383a9ad9208 100644
--- a/drivers/misc/mei/amthif.c
+++ b/drivers/misc/mei/amthif.c
@@ -315,6 +315,14 @@ int mei_amthif_write(struct mei_cl *cl, struct mei_cl_cb *cb)
 	dev = cl->dev;
 
 	list_add_tail(&cb->list, &dev->amthif_cmd_list.list);
+
+	/*
+	 * The previous request is still in processing, queue this one.
+	 */
+	if (dev->iamthif_state > MEI_IAMTHIF_IDLE &&
+	    dev->iamthif_state < MEI_IAMTHIF_READ_COMPLETE)
+		return 0;
+
 	return mei_amthif_run_next_cmd(dev);
 }
 
-- 
2.4.3