sparc32, leon: Require separate snoop tags set to regard snooping to be enabled

Even if data snooping is enabled, without separate snoop tags snooping will not
work when the MMU is enabled.
Signed-off-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/include/asm/leon.h

@@ -108,7 +108,7 @@ static inline int sparc_leon3_snooping_enabled(void)
 {
 	u32 cctrl;
 	__asm__ __volatile__("lda [%%g0] 2, %0\n\t" : "=r"(cctrl));
-        return (cctrl >> 23) & 1;
+	return ((cctrl >> 23) & 1) && ((cctrl >> 17) & 1);
 };
 
 static inline void sparc_leon3_disable_cache(void)