linux-kernel - [char-misc-next 1/7] mei: amthif: drop READ

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Message-Id: <1464120221-28151-2-git-send-email-tomas.winkler@intel.com>
Date:	Tue, 24 May 2016 16:03:35 -0400
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 1/7] mei: amthif: drop READ_COMPLETE state

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

AMTHIF code now uses read completed queue to store replies from the FW.
It is possible to send the next request as soon as a read from the FW is
completed. With these changes we don't need the READ_COMPLETE state.

Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
 drivers/misc/mei/amthif.c  | 34 +++++++++++-----------------------
 drivers/misc/mei/main.c    |  2 +-
 drivers/misc/mei/mei_dev.h |  5 +----
 3 files changed, 13 insertions(+), 28 deletions(-)

diff --git a/drivers/misc/mei/amthif.c b/drivers/misc/mei/amthif.c
index a039a5df6f21..13d89043ad76 100644
--- a/drivers/misc/mei/amthif.c
+++ b/drivers/misc/mei/amthif.c
@@ -299,8 +299,7 @@ int mei_amthif_write(struct mei_cl *cl, struct mei_cl_cb *cb)
 	/*
 	 * The previous request is still in processing, queue this one.
 	 */
-	if (dev->iamthif_state > MEI_IAMTHIF_IDLE &&
-	    dev->iamthif_state < MEI_IAMTHIF_READ_COMPLETE)
+	if (dev->iamthif_state != MEI_IAMTHIF_IDLE)
 		return 0;
 
 	return mei_amthif_run_next_cmd(dev);
@@ -309,7 +308,6 @@ int mei_amthif_write(struct mei_cl *cl, struct mei_cl_cb *cb)
 /**
  * mei_amthif_poll - the amthif poll function
  *
- * @dev: the device structure
  * @file: pointer to file structure
  * @wait: pointer to poll_table structure
  *
@@ -317,26 +315,19 @@ int mei_amthif_write(struct mei_cl *cl, struct mei_cl_cb *cb)
  *
  * Locking: called under "dev->device_lock" lock
  */
-
-unsigned int mei_amthif_poll(struct mei_device *dev,
-		struct file *file, poll_table *wait)
+unsigned int mei_amthif_poll(struct file *file, poll_table *wait)
 {
+	struct mei_cl *cl = file->private_data;
+	struct mei_cl_cb *cb = mei_cl_read_cb(cl, file);
 	unsigned int mask = 0;
 
-	poll_wait(file, &dev->iamthif_cl.rx_wait, wait);
-
-	if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE &&
-	    dev->iamthif_fp == file) {
-
+	poll_wait(file, &cl->rx_wait, wait);
+	if (cb)
 		mask |= POLLIN | POLLRDNORM;
-		mei_amthif_run_next_cmd(dev);
-	}
 
 	return mask;
 }
 
-
-
 /**
  * mei_amthif_irq_write - write iamthif command in irq thread context.
  *
@@ -393,7 +384,6 @@ int mei_amthif_irq_read_msg(struct mei_cl *cl,
 		return 0;
 
 	dev_dbg(dev->dev, "completed amthif read.\n ");
-	dev->iamthif_current_cb = NULL;
 	dev->iamthif_stall_timer = 0;
 
 	return 0;
@@ -425,14 +415,16 @@ void mei_amthif_complete(struct mei_cl *cl, struct mei_cl_cb *cb)
 	}
 
 	if (!dev->iamthif_canceled) {
-		dev->iamthif_state = MEI_IAMTHIF_READ_COMPLETE;
-		dev->iamthif_stall_timer = 0;
 		list_add_tail(&cb->list, &cl->rd_completed);
 		dev_dbg(dev->dev, "amthif read completed\n");
 	} else {
-		mei_amthif_run_next_cmd(dev);
+		mei_io_cb_free(cb);
 	}
 
+	dev->iamthif_current_cb = NULL;
+	dev->iamthif_stall_timer = 0;
+	mei_amthif_run_next_cmd(dev);
+
 	dev_dbg(dev->dev, "completing amthif call back.\n");
 	wake_up_interruptible(&cl->rx_wait);
 }
@@ -539,10 +531,6 @@ int mei_amthif_release(struct mei_device *dev, struct file *file)
 		dev_dbg(dev->dev, "amthif canceled iamthif state %d\n",
 		    dev->iamthif_state);
 		dev->iamthif_canceled = true;
-		if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE) {
-			dev_dbg(dev->dev, "run next amthif iamthif cb\n");
-			mei_amthif_run_next_cmd(dev);
-		}
 	}
 
 	if (mei_clear_lists(dev, file))
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
index 52635b063873..622ff19864df 100644
--- a/drivers/misc/mei/main.c
+++ b/drivers/misc/mei/main.c
@@ -610,7 +610,7 @@ static unsigned int mei_poll(struct file *file, poll_table *wait)
 	}
 
 	if (cl == &dev->iamthif_cl) {
-		mask = mei_amthif_poll(dev, file, wait);
+		mask = mei_amthif_poll(file, wait);
 		goto out;
 	}
 
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index e5e32503d4bc..fa6007707048 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -80,9 +80,7 @@ const char *mei_dev_state_str(int state);
 enum iamthif_states {
 	MEI_IAMTHIF_IDLE,
 	MEI_IAMTHIF_WRITING,
-	MEI_IAMTHIF_FLOW_CONTROL,
 	MEI_IAMTHIF_READING,
-	MEI_IAMTHIF_READ_COMPLETE
 };
 
 enum mei_file_transaction_states {
@@ -572,8 +570,7 @@ int mei_amthif_host_init(struct mei_device *dev, struct mei_me_client *me_cl);
 int mei_amthif_read(struct mei_device *dev, struct file *file,
 		char __user *ubuf, size_t length, loff_t *offset);
 
-unsigned int mei_amthif_poll(struct mei_device *dev,
-		struct file *file, poll_table *wait);
+unsigned int mei_amthif_poll(struct file *file, poll_table *wait);
 
 int mei_amthif_release(struct mei_device *dev, struct file *file);
 
-- 
2.5.5