---

yaml --- r: 96350 b: refs/heads/master c: fd3c3ed h: refs/heads/master v: v3
git-mirror · May 10, 2008 · dce3f91 · dce3f91
1 parent b4fa24b
commit dce3f91
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Showing 3 changed files with 20 additions and 4 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 0646153921892cc7a81320a6920beaca06b3e9f0
+refs/heads/master: fd3c3ed5d1e3ceb37635cbe6d220ab94aae0781d
diff --git a/trunk/arch/x86/kernel/i387.c b/trunk/arch/x86/kernel/i387.c
@@ -450,7 +450,6 @@ static inline int restore_i387_fsave(struct _fpstate_ia32 __user *buf)
 {
 	struct task_struct *tsk = current;
 
-	clear_fpu(tsk);
 	return __copy_from_user(&tsk->thread.xstate->fsave, buf,
 				sizeof(struct i387_fsave_struct));
 }
@@ -461,7 +460,6 @@ static int restore_i387_fxsave(struct _fpstate_ia32 __user *buf)
 	struct user_i387_ia32_struct env;
 	int err;
 
-	clear_fpu(tsk);
 	err = __copy_from_user(&tsk->thread.xstate->fxsave, &buf->_fxsr_env[0],
 			       sizeof(struct i387_fxsave_struct));
 	/* mxcsr reserved bits must be masked to zero for security reasons */
@@ -478,6 +476,16 @@ int restore_i387_ia32(struct _fpstate_ia32 __user *buf)
 	int err;
 
 	if (HAVE_HWFP) {
+		struct task_struct *tsk = current;
+
+		clear_fpu(tsk);
+
+		if (!used_math()) {
+			err = init_fpu(tsk);
+			if (err)
+				return err;
+		}
+
 		if (cpu_has_fxsr)
 			err = restore_i387_fxsave(buf);
 		else

diff --git a/trunk/include/asm-x86/i387.h b/trunk/include/asm-x86/i387.h
@@ -175,7 +175,15 @@ static inline int save_i387(struct _fpstate __user *buf)
  */
 static inline int restore_i387(struct _fpstate __user *buf)
 {
-	set_used_math();
+	struct task_struct *tsk = current;
+	int err;
+
+	if (!used_math()) {
+		err = init_fpu(tsk);
+		if (err)
+			return err;
+	}
+
 	if (!(task_thread_info(current)->status & TS_USEDFPU)) {
 		clts();
 		task_thread_info(current)->status |= TS_USEDFPU;