[ATM]: Cleanup br2684_ioctl_hook.

net/atm/br2684.c

@@ -16,9 +16,12 @@ Author: Marcell GAL, 2000, XDSL Ltd, Hungary
 #include <linux/ip.h>
 #include <asm/uaccess.h>
 #include <net/arp.h>
+#include <linux/atm.h>
+#include <linux/atmdev.h>
 
 #include <linux/atmbr2684.h>
 
+#include "common.h"
 #include "ipcommon.h"
 
 /*
@@ -768,8 +771,6 @@ static struct file_operations br2684_proc_operations = {
 
 extern struct proc_dir_entry *atm_proc_root;	/* from proc.c */
 
-extern int (*br2684_ioctl_hook)(struct atm_vcc *, unsigned int, unsigned long);
-
 /* the following avoids some spurious warnings from the compiler */
 #define UNUSED __attribute__((unused))
 
@@ -779,14 +780,14 @@ static int __init UNUSED br2684_init(void)
 	if ((p = create_proc_entry("br2684", 0, atm_proc_root)) == NULL)
 		return -ENOMEM;
 	p->proc_fops = &br2684_proc_operations;
-	br2684_ioctl_hook = br2684_ioctl;
+	br2684_ioctl_set(br2684_ioctl);
 	return 0;
 }
 
 static void __exit UNUSED br2684_exit(void)
 {
 	struct br2684_dev *brdev;
-	br2684_ioctl_hook = NULL;
+	br2684_ioctl_set(NULL);
 	remove_proc_entry("br2684", atm_proc_root);
 	while (!list_empty(&br2684_devs)) {
 		brdev = list_entry_brdev(br2684_devs.next);

net/atm/common.c

@@ -145,9 +145,18 @@ EXPORT_SYMBOL(pppoatm_ioctl_set);
 #endif
 
 #if defined(CONFIG_ATM_BR2684) || defined(CONFIG_ATM_BR2684_MODULE)
-int (*br2684_ioctl_hook)(struct atm_vcc *, unsigned int, unsigned long);
+static DECLARE_MUTEX(br2684_ioctl_mutex);
+
+static int (*br2684_ioctl_hook)(struct atm_vcc *, unsigned int, unsigned long);
+
+void br2684_ioctl_set(int (*hook)(struct atm_vcc *, unsigned int, unsigned long))
+{
+	down(&br2684_ioctl_mutex);
+	br2684_ioctl_hook = hook;
+	up(&br2684_ioctl_mutex);
+}
 #ifdef CONFIG_ATM_BR2684_MODULE
-EXPORT_SYMBOL(br2684_ioctl_hook);
+EXPORT_SYMBOL(br2684_ioctl_set);
 #endif
 #endif
 
@@ -880,11 +889,12 @@ int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 		goto done;
 #endif
 #if defined(CONFIG_ATM_BR2684) || defined(CONFIG_ATM_BR2684_MODULE)
-	if (br2684_ioctl_hook) {
+	down(&br2684_ioctl_mutex);
+	if (br2684_ioctl_hook)
 		error = br2684_ioctl_hook(vcc, cmd, arg);
+	up(&br2684_ioctl_mutex);
 	if (error != -ENOIOCTLCMD)
 		goto done;
-	}
 #endif
 
 	error = atm_dev_ioctl(cmd, arg);

net/atm/common.h

@@ -27,6 +27,7 @@ int vcc_getsockopt(struct socket *sock, int level, int optname, char *optval,
 void atm_shutdown_dev(struct atm_dev *dev);
 
 void pppoatm_ioctl_set(int (*hook)(struct atm_vcc *, unsigned int, unsigned long));
+void br2684_ioctl_set(int (*hook)(struct atm_vcc *, unsigned int, unsigned long));
 
 int atmpvc_init(void);
 void atmpvc_exit(void);