staging: most: remove dependency on networking-aim

The modules hdm-usb and hdm-dim2 depend on the module aim-network, because
they use the function most_deliver_netinfo that it exports.

To remove this dependency, this patch replaces the call of the function
most_deliver_netinfo with the call of the function that is the parameter
'on_netinfo' of the function request_netinfo.
Signed-off-by: Andrey Shvetsov <andrey.shvetsov@k2l.de>
Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/most/aim-network/networking.c

@@ -22,7 +22,6 @@
 #include <linux/wait.h>
 #include <linux/kobject.h>
 #include "mostcore.h"
-#include "networking.h"
 
 #define MEP_HDR_LEN 8
 #define MDP_HDR_LEN 16
@@ -176,6 +175,9 @@ static int most_nd_set_mac_address(struct net_device *dev, void *p)
 	return 0;
 }
 
+static void on_netinfo(struct most_interface *iface,
+		       unsigned char link_stat, unsigned char *mac_addr);
+
 static int most_nd_open(struct net_device *dev)
 {
 	struct net_dev_context *nd = dev->ml_priv;
@@ -204,7 +206,7 @@ static int most_nd_open(struct net_device *dev)
 		netif_dormant_on(dev);
 	netif_wake_queue(dev);
 	if (nd->iface->request_netinfo)
-		nd->iface->request_netinfo(nd->iface, nd->tx.ch_id);
+		nd->iface->request_netinfo(nd->iface, nd->tx.ch_id, on_netinfo);
 	return 0;
 }
 
@@ -216,6 +218,8 @@ static int most_nd_stop(struct net_device *dev)
 
 	BUG_ON(nd->dev != dev);
 	netif_stop_queue(dev);
+	if (nd->iface->request_netinfo)
+		nd->iface->request_netinfo(nd->iface, nd->tx.ch_id, NULL);
 	most_stop_channel(nd->iface, nd->rx.ch_id, &aim);
 	most_stop_channel(nd->iface, nd->tx.ch_id, &aim);
 
@@ -527,13 +531,13 @@ static void __exit most_net_exit(void)
 }
 
 /**
- * most_deliver_netinfo - callback for HDM to be informed about HW's MAC
+ * on_netinfo - callback for HDM to be informed about HW's MAC
  * @param iface - most interface instance
  * @param link_stat - link status
  * @param mac_addr - MAC address
  */
-void most_deliver_netinfo(struct most_interface *iface,
-			  unsigned char link_stat, unsigned char *mac_addr)
+static void on_netinfo(struct most_interface *iface,
+		       unsigned char link_stat, unsigned char *mac_addr)
 {
 	struct net_dev_context *nd;
 	struct net_device *dev;
@@ -564,7 +568,6 @@ void most_deliver_netinfo(struct most_interface *iface,
 		}
 	}
 }
-EXPORT_SYMBOL(most_deliver_netinfo);
 
 module_init(most_net_init);
 module_exit(most_net_exit);

drivers/staging/most/aim-network/networking.h

-/*
- * Networking AIM - Networking Application Interface Module for MostCore
- *
- * Copyright (C) 2015, Microchip Technology Germany II GmbH & Co. KG
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * This file is licensed under GPLv2.
- */
-#ifndef _NETWORKING_H_
-#define _NETWORKING_H_
-
-#include "mostcore.h"
-
-void most_deliver_netinfo(struct most_interface *iface,
-			  unsigned char link_stat, unsigned char *mac_addr);
-
-#endif

drivers/staging/most/hdm-dim2/Kconfig

@@ -4,7 +4,6 @@
 
 config HDM_DIM2
 	tristate "DIM2 HDM"
-	depends on AIM_NETWORK
 	depends on HAS_IOMEM
 
 	---help---

drivers/staging/most/hdm-dim2/dim2_hdm.c

@@ -26,7 +26,6 @@
 #include <linux/kthread.h>
 
 #include <mostcore.h>
-#include <networking.h>
 #include "dim2_hal.h"
 #include "dim2_hdm.h"
 #include "dim2_errors.h"
@@ -107,6 +106,8 @@ struct dim2_hdm {
 	unsigned char link_state;
 	int atx_idx;
 	struct medialb_bus bus;
+	void (*on_netinfo)(struct most_interface *,
+			   unsigned char, unsigned char *);
 };
 
 #define iface_to_hdm(iface) container_of(iface, struct dim2_hdm, most_iface)
@@ -287,8 +288,11 @@ static int deliver_netinfo_thread(void *data)
 
 		if (dev->deliver_netinfo) {
 			dev->deliver_netinfo--;
-			most_deliver_netinfo(&dev->most_iface, dev->link_state,
-					     dev->mac_addrs);
+			if (dev->on_netinfo) {
+				dev->on_netinfo(&dev->most_iface,
+						dev->link_state,
+						dev->mac_addrs);
+			}
 		}
 	}
 
@@ -654,12 +658,18 @@ static int enqueue(struct most_interface *most_iface, int ch_idx,
  * Send a command to INIC which triggers retrieving of network info by means of
  * "Message exchange over MDP/MEP". Return 0 on success, negative on failure.
  */
-static void request_netinfo(struct most_interface *most_iface, int ch_idx)
+static void request_netinfo(struct most_interface *most_iface, int ch_idx,
+			    void (*on_netinfo)(struct most_interface *,
+					       unsigned char, unsigned char *))
 {
 	struct dim2_hdm *dev = iface_to_hdm(most_iface);
 	struct mbo *mbo;
 	u8 *data;
 
+	dev->on_netinfo = on_netinfo;
+	if (!on_netinfo)
+		return;
+
 	if (dev->atx_idx < 0) {
 		pr_err("Async Tx Not initialized\n");
 		return;

drivers/staging/most/hdm-usb/Kconfig

@@ -5,7 +5,7 @@
 config HDM_USB
 	tristate "USB HDM"
 	depends on USB && NET
-	select AIM_NETWORK
+
 	---help---
 	  Say Y here if you want to connect via USB to network tranceiver.
 	  This device driver depends on the networking AIM.

drivers/staging/most/hdm-usb/hdm_usb.c

@@ -30,7 +30,6 @@
 #include <linux/etherdevice.h>
 #include <linux/uaccess.h>
 #include "mostcore.h"
-#include "networking.h"
 
 #define USB_MTU			512
 #define NO_ISOCHRONOUS_URB	0
@@ -126,6 +125,8 @@ struct most_dev {
 	struct mutex io_mutex;
 	struct timer_list link_stat_timer;
 	struct work_struct poll_work_obj;
+	void (*on_netinfo)(struct most_interface *, unsigned char,
+			   unsigned char *);
 };
 
 #define to_mdev(d) container_of(d, struct most_dev, iface)
@@ -719,12 +720,19 @@ static int hdm_configure_channel(struct most_interface *iface, int channel,
  * polls for the NI state of the INIC every 2 seconds.
  *
  */
-static void hdm_request_netinfo(struct most_interface *iface, int channel)
+static void hdm_request_netinfo(struct most_interface *iface, int channel,
+				void (*on_netinfo)(struct most_interface *,
+						   unsigned char,
+						   unsigned char *))
 {
 	struct most_dev *mdev;
 
 	BUG_ON(!iface);
 	mdev = to_mdev(iface);
+	mdev->on_netinfo = on_netinfo;
+	if (!on_netinfo)
+		return;
+
 	mdev->link_stat_timer.expires = jiffies + HZ;
 	mod_timer(&mdev->link_stat_timer, mdev->link_stat_timer.expires);
 }
@@ -786,7 +794,8 @@ static void wq_netinfo(struct work_struct *wq_obj)
 	hw_addr[4] = lo >> 8;
 	hw_addr[5] = lo;
 
-	most_deliver_netinfo(&mdev->iface, link, hw_addr);
+	if (mdev->on_netinfo)
+		mdev->on_netinfo(&mdev->iface, link, hw_addr);
 }
 
 /**

drivers/staging/most/mostcore/mostcore.h

@@ -233,6 +233,8 @@ struct mbo {
  *   The callback returns a negative value on error, otherwise 0.
  * @request_netinfo: triggers retrieving of network info from the HDM by
  *   means of "Message exchange over MDP/MEP"
+ *   The call of the function request_netinfo with the parameter on_netinfo as
+ *   NULL prohibits use of the previously obtained function pointer.
  * @priv Private field used by mostcore to store context information.
  */
 struct most_interface {
@@ -246,7 +248,10 @@ struct most_interface {
 	int (*enqueue)(struct most_interface *iface, int channel_idx,
 		       struct mbo *mbo);
 	int (*poison_channel)(struct most_interface *iface, int channel_idx);
-	void (*request_netinfo)(struct most_interface *iface, int channel_idx);
+	void (*request_netinfo)(struct most_interface *iface, int channel_idx,
+				void (*on_netinfo)(struct most_interface *iface,
+						   unsigned char link_stat,
+						   unsigned char *mac_addr));
 	void *priv;
 };