--- linux-2.4.20-quota-ctx/kernel/sys.c	2003-01-30 14:40:56.000000000 +0000
+++ new/kernel/sys.c	2003-03-17 21:52:38.000000000 +0000
@@ -15,6 +15,7 @@
 #include <linux/prctl.h>
 #include <linux/init.h>
 #include <linux/highuid.h>
+#include <linux/spinlock.h>
 
 #include <asm/uaccess.h>
 #include <asm/io.h>
@@ -1089,6 +1090,8 @@
 	}
 }
 
+spinlock_t ip_info_lock = SPIN_LOCK_UNLOCKED;
+
 /*
 	Decrease the reference count on the ip_info struct
 	Free the struct if the reference count reach 0.
@@ -1096,13 +1099,13 @@
 void sys_release_ip_info (struct iproot_info *ip_info)
 {
 	if (ip_info != NULL){
-		down_write (&uts_sem);
+		spin_lock(&ip_info_lock);
 		ip_info->refcount--;
 		if (ip_info->refcount == 0){
-			// printk ("vfree s_info %d\n",p->pid);
+			// printk ("%5d vfree ip_info 0x%08x\n", current->pid, ip_info );
 			vfree (ip_info);
 		}
-		up_write (&uts_sem);
+		spin_unlock(&ip_info_lock);
 	}
 }
 /*
@@ -1111,9 +1114,9 @@
 void sys_assign_ip_info (struct iproot_info *ip_info)
 {
 	if (ip_info != NULL){
-		down_write (&uts_sem);
+		spin_lock(&ip_info_lock);
 		ip_info->refcount++;
-		up_write (&uts_sem);
+		spin_unlock(&ip_info_lock);
 	}
 }