From 928bd1b4709045355fad8bf858904884c0a1e87f Mon Sep 17 00:00:00 2001
From: Russell King <rmk@dyn-67.arm.linux.org.uk>
Date: Tue, 25 Apr 2006 20:41:27 +0100
Subject: [PATCH] [ARM] vfp: fix leak of VFP_NAN_FLAG into FPSCR

The VFP code can leak VFP_NAN_FLAG into the FPSCR. It doesn't correspond
to any real FPSCR bit (and overlaps one of the exception flags).

Bug report from Daniel Jacobowitz

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/vfp/vfpdouble.c | 2 +-
 arch/arm/vfp/vfpmodule.c | 2 +-
 arch/arm/vfp/vfpsingle.c | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm/vfp/vfpdouble.c b/arch/arm/vfp/vfpdouble.c
index febd115dba28a..009038c8113e8 100644
--- a/arch/arm/vfp/vfpdouble.c
+++ b/arch/arm/vfp/vfpdouble.c
@@ -197,7 +197,7 @@ u32 vfp_double_normaliseround(int dd, struct vfp_double *vd, u32 fpscr, u32 exce
 			 dd, d, exceptions);
 		vfp_put_double(dd, d);
 	}
-	return exceptions & ~VFP_NAN_FLAG;
+	return exceptions;
 }
 
 /*
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c
index 22f3da4e0829b..37ff8145b5b50 100644
--- a/arch/arm/vfp/vfpmodule.c
+++ b/arch/arm/vfp/vfpmodule.c
@@ -180,7 +180,7 @@ static u32 vfp_emulate_instruction(u32 inst, u32 fpscr, struct pt_regs *regs)
 		 * emulate it.
 		 */
 	}
-	return exceptions;
+	return exceptions & ~VFP_NAN_FLAG;
 }
 
 /*
diff --git a/arch/arm/vfp/vfpsingle.c b/arch/arm/vfp/vfpsingle.c
index 4ac27f1939347..dae2c2f460529 100644
--- a/arch/arm/vfp/vfpsingle.c
+++ b/arch/arm/vfp/vfpsingle.c
@@ -203,7 +203,7 @@ u32 vfp_single_normaliseround(int sd, struct vfp_single *vs, u32 fpscr, u32 exce
 		vfp_put_float(sd, d);
 	}
 
-	return exceptions & ~VFP_NAN_FLAG;
+	return exceptions;
 }
 
 /*
-- 
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