[PATCH v2 2/2] powerpc/pseries: Add failure related checks for h_get_mpp and h_get_ppp

[Shrikanth Hegde <sshegde@linux.ibm.com>]

Couple of Minor fixes:

- hcall return values are long. Fix that for h_get_mpp, h_get_ppp and
parse_ppp_data

- If hcall fails, values set should be at-least zero. It shouldn't be
uninitialized values. Fix that for h_get_mpp and h_get_ppp

Signed-off-by: Shrikanth Hegde <sshegde@linux.ibm.com>
---
 arch/powerpc/include/asm/hvcall.h        | 2 +-
 arch/powerpc/platforms/pseries/lpar.c    | 6 +++---
 arch/powerpc/platforms/pseries/lparcfg.c | 6 +++---
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/include/asm/hvcall.h b/arch/powerpc/include/asm/hvcall.h
index a41e542ba94d..3d642139b900 100644
--- a/arch/powerpc/include/asm/hvcall.h
+++ b/arch/powerpc/include/asm/hvcall.h
@@ -570,7 +570,7 @@ struct hvcall_mpp_data {
 	unsigned long backing_mem;
 };

-int h_get_mpp(struct hvcall_mpp_data *);
+long h_get_mpp(struct hvcall_mpp_data *mpp_data);

 struct hvcall_mpp_x_data {
 	unsigned long coalesced_bytes;
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index 4e9916bb03d7..c1d8bee8f701 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -1886,10 +1886,10 @@ notrace void __trace_hcall_exit(long opcode, long retval, unsigned long *retbuf)
  * h_get_mpp
  * H_GET_MPP hcall returns info in 7 parms
  */
-int h_get_mpp(struct hvcall_mpp_data *mpp_data)
+long h_get_mpp(struct hvcall_mpp_data *mpp_data)
 {
-	int rc;
-	unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
+	unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = {0};
+	long rc;

 	rc = plpar_hcall9(H_GET_MPP, retbuf);

diff --git a/arch/powerpc/platforms/pseries/lparcfg.c b/arch/powerpc/platforms/pseries/lparcfg.c
index 5c2a3e802a02..ed2176d8a866 100644
--- a/arch/powerpc/platforms/pseries/lparcfg.c
+++ b/arch/powerpc/platforms/pseries/lparcfg.c
@@ -113,8 +113,8 @@ struct hvcall_ppp_data {
  */
 static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
 {
-	unsigned long rc;
-	unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
+	unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = {0};
+	long rc;

 	rc = plpar_hcall9(H_GET_PPP, retbuf);

@@ -197,7 +197,7 @@ static void parse_ppp_data(struct seq_file *m)
 	struct hvcall_ppp_data ppp_data;
 	struct device_node *root;
 	const __be32 *perf_level;
-	int rc;
+	long rc;

 	rc = h_get_ppp(&ppp_data);
 	if (rc)
--
2.39.3