[PATCH v4 1/5] powerpc/vphn: Check for error from hcall_vphn

[Srikar Dronamraju <srikar@linux.vnet.ibm.com>]

There is no value in unpacking associativity, if
H_HOME_NODE_ASSOCIATIVITY hcall has returned an error.

Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Nathan Lynch <nathanl@linux.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
Reported-by: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
---
Changelog (v2->v1):
- Split the patch into 2(Suggested by Nathan).

 arch/powerpc/platforms/pseries/vphn.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/pseries/vphn.c b/arch/powerpc/platforms/pseries/vphn.c
index 3f07bf6..cca474a 100644
--- a/arch/powerpc/platforms/pseries/vphn.c
+++ b/arch/powerpc/platforms/pseries/vphn.c
@@ -82,7 +82,8 @@ long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity)
 	long retbuf[PLPAR_HCALL9_BUFSIZE] = {0};
 
 	rc = plpar_hcall9(H_HOME_NODE_ASSOCIATIVITY, retbuf, flags, cpu);
-	vphn_unpack_associativity(retbuf, associativity);
+	if (rc == H_SUCCESS)
+		vphn_unpack_associativity(retbuf, associativity);
 
 	return rc;
 }
-- 
1.8.3.1