[PATCH 4/8] x86: cacheinfo: correct return value when cache_disable feature is not active

[Andreas Herrmann <andreas.herrmann3@amd.com>]

Impact: bug fix

If user writes to "cache_disable" attribute on a CPU that does not support
this feature, the process hangs due to an invalid return value in
store_cache_disable().

CC: Mark Langsdorf <mark.langsdorf@amd.com>
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
---
 arch/x86/kernel/cpu/intel_cacheinfo.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/cpu/intel_cacheinfo.c b/arch/x86/kernel/cpu/intel_cacheinfo.c
index 3973506..9dac235 100644
--- a/arch/x86/kernel/cpu/intel_cacheinfo.c
+++ b/arch/x86/kernel/cpu/intel_cacheinfo.c
@@ -771,7 +771,7 @@ store_cache_disable(struct _cpuid4_info *this_leaf, const char *buf,
 	unsigned int ret, index, val;
 
 	if (!this_leaf->can_disable)
-		return 0;
+		return -EINVAL;
 
 	if (strlen(buf) > 15)
 		return -EINVAL;
-- 
1.6.2