mei: add file pointer to the host client structure

Store the file associated with a client in the host client structure,
this enables dropping the special amthif client file pointer from struct
mei_device, and this is also a preparation for changing the way rx
packet allocation for fixed_address clients

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>

drivers/misc/mei/amthif.c

@@ -204,7 +204,7 @@ static int mei_amthif_read_start(struct mei_cl *cl, const struct file *file)
 	list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
 
 	dev->iamthif_state = MEI_IAMTHIF_READING;
-	dev->iamthif_fp = cb->fp;
+	cl->fp = cb->fp;
 
 	return 0;
 }
@@ -230,13 +230,13 @@ int mei_amthif_run_next_cmd(struct mei_device *dev)
 					typeof(*cb), list);
 	if (!cb) {
 		dev->iamthif_state = MEI_IAMTHIF_IDLE;
-		dev->iamthif_fp = NULL;
+		cl->fp = NULL;
 		return 0;
 	}
 
 	list_del_init(&cb->list);
 	dev->iamthif_state = MEI_IAMTHIF_WRITING;
-	dev->iamthif_fp = cb->fp;
+	cl->fp = cb->fp;
 
 	ret = mei_cl_write(cl, cb, false);
 	if (ret < 0)
@@ -375,7 +375,7 @@ void mei_amthif_complete(struct mei_cl *cl, struct mei_cl_cb *cb)
 			return;
 		}
 		dev->iamthif_state = MEI_IAMTHIF_IDLE;
-		dev->iamthif_fp = NULL;
+		cl->fp = NULL;
 		if (!dev->iamthif_canceled) {
 			/*
 			 * in case of error enqueue the write cb to complete
@@ -453,11 +453,12 @@ static void mei_clear_lists(struct mei_device *dev, const struct file *file)
 */
 int mei_amthif_release(struct mei_device *dev, struct file *file)
 {
+	struct mei_cl *cl = file->private_data;
+
 	if (dev->iamthif_open_count > 0)
 		dev->iamthif_open_count--;
 
-	if (dev->iamthif_fp == file &&
-	    dev->iamthif_state != MEI_IAMTHIF_IDLE) {
+	if (cl->fp == file && dev->iamthif_state != MEI_IAMTHIF_IDLE) {
 
 		dev_dbg(dev->dev, "amthif canceled iamthif state %d\n",
 		    dev->iamthif_state);

drivers/misc/mei/interrupt.c

@@ -516,7 +516,6 @@ void mei_timer(struct work_struct *work)
 			dev_err(dev->dev, "timer: amthif  hanged.\n");
 			mei_reset(dev);
 
-			dev->iamthif_fp = NULL;
 			mei_amthif_run_next_cmd(dev);
 		}
 	}

drivers/misc/mei/main.c

@@ -71,6 +71,7 @@ static int mei_open(struct inode *inode, struct file *file)
 		goto err_unlock;
 	}
 
+	cl->fp = file;
 	file->private_data = cl;
 
 	mutex_unlock(&dev->device_lock);

drivers/misc/mei/mei_dev.h

@@ -200,6 +200,7 @@ struct mei_cl_cb {
  * @ev_async: event async notification
  * @status: connection status
  * @me_cl: fw client connected
+ * @fp: file associated with client
  * @host_client_id: host id
  * @mei_flow_ctrl_creds: transmit flow credentials
  * @timer_count:  watchdog timer for operation completion
@@ -223,6 +224,7 @@ struct mei_cl {
 	struct fasync_struct *ev_async;
 	int status;
 	struct mei_me_client *me_cl;
+	const struct file *fp;
 	u8 host_client_id;
 	u8 mei_flow_ctrl_creds;
 	u8 timer_count;
@@ -398,7 +400,6 @@ const char *mei_pg_state_str(enum mei_pg_state state);
  * @override_fixed_address: force allow fixed address behavior
  *
  * @amthif_cmd_list : amthif list for cmd waiting
- * @iamthif_fp : file for current amthif operation
  * @iamthif_cl  : amthif host client
  * @iamthif_open_count : number of opened amthif connections
  * @iamthif_stall_timer : timer to detect amthif hang
@@ -481,8 +482,6 @@ struct mei_device {
 
 	/* amthif list for cmd waiting */
 	struct mei_cl_cb amthif_cmd_list;
-	/* driver managed amthif list for reading completed amthif cmd data */
-	const struct file *iamthif_fp;
 	struct mei_cl iamthif_cl;
 	long iamthif_open_count;
 	u32 iamthif_stall_timer;