mei: drop amthif internal client

AMTHIF has special support in the mei drive, it handles multiplexing
multiple user space connection above single me client connection.
Since there is no additional addressing information there is a strict
requirement on the traffic order on each connection and on the "read
after write" order within the connection. This creates a lot of
complexity mostly because the other client types do not necessarily fall
under the same restriction.    After carefully studying the use of the
AMTHIF client, we came to conclusion that the multiplexing is not really
utilized by any application and we may safely remove that support and
significantly simplify the driver.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 7 insertions, 31 deletions

diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index 406e9e2b2fff..c14e35201721 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -47,10 +47,7 @@ void mei_irq_compl_handler(struct mei_device *dev, struct list_head *cmpl_list)
 		list_del_init(&cb->list);
 
 		dev_dbg(dev->dev, "completing call back.\n");
-		if (cl == &dev->iamthif_cl)
-			mei_amthif_complete(cl, cb);
-		else
-			mei_cl_complete(cl, cb);
+		mei_cl_complete(cl, cb);
 	}
 }
 EXPORT_SYMBOL_GPL(mei_irq_compl_handler);
@@ -76,7 +73,7 @@ static inline int mei_cl_hbm_equal(struct mei_cl *cl,
  * @dev: mei device
  * @hdr: message header
  */
-void mei_irq_discard_msg(struct mei_device *dev, struct mei_msg_hdr *hdr)
+static void mei_irq_discard_msg(struct mei_device *dev, struct mei_msg_hdr *hdr)
 {
 	/*
 	 * no need to check for size as it is guarantied
@@ -96,9 +93,9 @@ void mei_irq_discard_msg(struct mei_device *dev, struct mei_msg_hdr *hdr)
  *
  * Return: always 0
  */
-int mei_cl_irq_read_msg(struct mei_cl *cl,
-		       struct mei_msg_hdr *mei_hdr,
-		       struct list_head *cmpl_list)
+static int mei_cl_irq_read_msg(struct mei_cl *cl,
+			       struct mei_msg_hdr *mei_hdr,
+			       struct list_head *cmpl_list)
 {
 	struct mei_device *dev = cl->dev;
 	struct mei_cl_cb *cb;
@@ -313,11 +310,7 @@ int mei_irq_read_handler(struct mei_device *dev,
 		goto end;
 	}
 
-	if (cl == &dev->iamthif_cl) {
-		ret = mei_amthif_irq_read_msg(cl, mei_hdr, cmpl_list);
-	} else {
-		ret = mei_cl_irq_read_msg(cl, mei_hdr, cmpl_list);
-	}
+	ret = mei_cl_irq_read_msg(cl, mei_hdr, cmpl_list);
 
 
 reset_slots:
@@ -423,10 +416,7 @@ int mei_irq_write_handler(struct mei_device *dev, struct list_head *cmpl_list)
 	dev_dbg(dev->dev, "complete write list cb.\n");
 	list_for_each_entry_safe(cb, next, &dev->write_list, list) {
 		cl = cb->cl;
-		if (cl == &dev->iamthif_cl)
-			ret = mei_amthif_irq_write(cl, cb, cmpl_list);
-		else
-			ret = mei_cl_irq_write(cl, cb, cmpl_list);
+		ret = mei_cl_irq_write(cl, cb, cmpl_list);
 		if (ret)
 			return ret;
 	}
@@ -512,20 +502,6 @@ void mei_timer(struct work_struct *work)
 		}
 	}
 
-	if (!mei_cl_is_connected(&dev->iamthif_cl))
-		goto out;
-
-	if (dev->iamthif_stall_timer) {
-		if (--dev->iamthif_stall_timer == 0) {
-			dev_err(dev->dev, "timer: amthif  hanged.\n");
-			mei_reset(dev);
-
-			mei_amthif_run_next_cmd(dev);
-			goto out;
-		}
-		reschedule_timer = true;
-	}
-
 out:
 	if (dev->dev_state != MEI_DEV_DISABLED && reschedule_timer)
 		mei_schedule_stall_timer(dev);