X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=arch%2Fum%2Fsys-i386%2Fldt.c;h=762a12aec7578c2a6f4d7f3c9a3076e09dae99c3;hb=4c9e13851315a25a705e7a686116e491041ca228;hp=69971b78beaf9900a92d27de56117343f05d26c7;hpb=a12f66fccf2e266ad197df142b5ebafc6a169a8c;p=linux-2.6-omap-h63xx.git

diff --git a/arch/um/sys-i386/ldt.c b/arch/um/sys-i386/ldt.c
index 69971b78bea..762a12aec75 100644
--- a/arch/um/sys-i386/ldt.c
+++ b/arch/um/sys-i386/ldt.c
@@ -3,12 +3,11 @@
  * Licensed under the GPL
  */
 
-#include "linux/stddef.h"
-#include "linux/config.h"
 #include "linux/sched.h"
 #include "linux/slab.h"
 #include "linux/types.h"
 #include "linux/errno.h"
+#include "linux/spinlock.h"
 #include "asm/uaccess.h"
 #include "asm/smp.h"
 #include "asm/ldt.h"
@@ -20,72 +19,6 @@
 
 extern int modify_ldt(int func, void *ptr, unsigned long bytecount);
 
-#ifdef CONFIG_MODE_TT
-
-static long do_modify_ldt_tt(int func, void __user *ptr,
-			      unsigned long bytecount)
-{
-	struct user_desc info;
-	int res = 0;
-	void *buf = NULL;
-	void *p = NULL; /* What we pass to host. */
-
-	switch(func){
-	case 1:
-	case 0x11: /* write_ldt */
-		/* Do this check now to avoid overflows. */
-		if (bytecount != sizeof(struct user_desc)) {
-			res = -EINVAL;
-			goto out;
-		}
-
-		if(copy_from_user(&info, ptr, sizeof(info))) {
-			res = -EFAULT;
-			goto out;
-		}
-
-		p = &info;
-		break;
-	case 0:
-	case 2: /* read_ldt */
-
-		/* The use of info avoids kmalloc on the write case, not on the
-		 * read one. */
-		buf = kmalloc(bytecount, GFP_KERNEL);
-		if (!buf) {
-			res = -ENOMEM;
-			goto out;
-		}
-		p = buf;
-		break;
-	default:
-		res = -ENOSYS;
-		goto out;
-	}
-
-	res = modify_ldt(func, p, bytecount);
-	if(res < 0)
-		goto out;
-
-	switch(func){
-	case 0:
-	case 2:
-		/* Modify_ldt was for reading and returned the number of read
-		 * bytes.*/
-		if(copy_to_user(ptr, p, res))
-			res = -EFAULT;
-		break;
-	}
-
-out:
-	kfree(buf);
-	return res;
-}
-
-#endif
-
-#ifdef CONFIG_MODE_SKAS
-
 #include "skas.h"
 #include "skas_ptrace.h"
 #include "asm/mmu_context.h"
@@ -168,7 +101,7 @@ static long read_ldt_from_host(void __user * ptr, unsigned long bytecount)
 	struct ptrace_ldt ptrace_ldt = (struct ptrace_ldt) {
 			.func = 0,
 			.bytecount = bytecount,
-			.ptr = (void *)kmalloc(bytecount, GFP_KERNEL)};
+			.ptr = kmalloc(bytecount, GFP_KERNEL)};
 	u32 cpu;
 
 	if(ptrace_ldt.ptr == NULL)
@@ -388,23 +321,34 @@ static long do_modify_ldt_skas(int func, void __user *ptr,
 	return ret;
 }
 
-short dummy_list[9] = {0, -1};
-short * host_ldt_entries = NULL;
+static DEFINE_SPINLOCK(host_ldt_lock);
+static short dummy_list[9] = {0, -1};
+static short * host_ldt_entries = NULL;
 
-void ldt_get_host_info(void)
+static void ldt_get_host_info(void)
 {
 	long ret;
 	struct ldt_entry * ldt;
+	short *tmp;
 	int i, size, k, order;
 
+	spin_lock(&host_ldt_lock);
+
+	if(host_ldt_entries != NULL){
+		spin_unlock(&host_ldt_lock);
+		return;
+	}
 	host_ldt_entries = dummy_list+1;
 
+	spin_unlock(&host_ldt_lock);
+
 	for(i = LDT_PAGES_MAX-1, order=0; i; i>>=1, order++);
 
 	ldt = (struct ldt_entry *)
 	      __get_free_pages(GFP_KERNEL|__GFP_ZERO, order);
 	if(ldt == NULL) {
-		printk("ldt_get_host_info: couldn't allocate buffer for host ldt\n");
+		printk("ldt_get_host_info: couldn't allocate buffer for host "
+		       "ldt\n");
 		return;
 	}
 
@@ -428,11 +372,13 @@ void ldt_get_host_info(void)
 		host_ldt_entries = dummy_list;
 	else {
 		size = (size + 1) * sizeof(dummy_list[0]);
-		host_ldt_entries = (short *)kmalloc(size, GFP_KERNEL);
-		if(host_ldt_entries == NULL) {
-			printk("ldt_get_host_info: couldn't allocate host ldt list\n");
+		tmp = kmalloc(size, GFP_KERNEL);
+		if(tmp == NULL) {
+			printk("ldt_get_host_info: couldn't allocate host ldt "
+			       "list\n");
 			goto out_free;
 		}
+		host_ldt_entries = tmp;
 	}
 
 	for(i=0, k=0; i<ret/LDT_ENTRY_SIZE; i++){
@@ -482,8 +428,7 @@ long init_new_ldt(struct mmu_context_skas * new_mm,
 			 * inherited from the host. All ldt-entries found
 			 * will be reset in the following loop
 			 */
-			if(host_ldt_entries == NULL)
-				ldt_get_host_info();
+			ldt_get_host_info();
 			for(num_p=host_ldt_entries; *num_p != -1; num_p++){
 				desc.entry_number = *num_p;
 				err = write_ldt_entry(&new_mm->id, 1, &desc,
@@ -558,10 +503,9 @@ void free_ldt(struct mmu_context_skas * mm)
 	}
 	mm->ldt.entry_count = 0;
 }
-#endif
 
 int sys_modify_ldt(int func, void __user *ptr, unsigned long bytecount)
 {
-	return(CHOOSE_MODE_PROC(do_modify_ldt_tt, do_modify_ldt_skas, func,
-	                        ptr, bytecount));
+	return CHOOSE_MODE_PROC(do_modify_ldt_tt, do_modify_ldt_skas, func,
+	                        ptr, bytecount);
 }