[PATCH v4 2/9] pseries/plpks: fix double conversion of wrapping key flush errors

[Srish Srinivasan <ssrish@linux.ibm.com>]

plpks_confirm_object_flushed() returns zero or a negative Linux errno.
However, plpks_gen_wrapping_key() passes this return value through
pseries_status_to_err(), which treats it as a raw hypervisor status and
converts it again.

Convert only errors returned by H_PKS_GEN_KEY, and propagate errors from
plpks_confirm_object_flushed() unchanged.

Fixes: 133aa79e211d ("pseries/plpks: add HCALLs for PowerVM Key Wrapping Module")
Cc: stable@vger.kernel.org # 7.0
Signed-off-by: Srish Srinivasan <ssrish@linux.ibm.com>
---
 arch/powerpc/platforms/pseries/plpks.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/plpks.c b/arch/powerpc/platforms/pseries/plpks.c
index c86960f102dc..584091f9aa08 100644
--- a/arch/powerpc/platforms/pseries/plpks.c
+++ b/arch/powerpc/platforms/pseries/plpks.c
@@ -938,7 +938,7 @@ int plpks_gen_wrapping_key(void)
 	unsigned long retbuf[PLPAR_HCALL_BUFSIZE] = { 0 };
 	struct plpks_auth *auth;
 	struct label *label;
-	int rc = 0, pseries_status = 0;
+	int rc, pseries_status;
 	struct plpks_var var = {
 		.name = PLPKS_DEFAULT_WRAPKEY_LABEL,
 		.namelen = sizeof(PLPKS_DEFAULT_WRAPKEY_LABEL) - 1,
@@ -962,17 +962,17 @@ int plpks_gen_wrapping_key(void)
 			 label->size, var.policy,
 			 NULL, PLPKS_WRAPPING_KEY_LENGTH);
 
-	if (!rc)
+	if (!rc) {
 		rc = plpks_confirm_object_flushed(label, auth);
-
-	pseries_status = rc;
-	rc = pseries_status_to_err(rc);
-
-	if (rc && rc != -EEXIST) {
-		pr_err("H_PKS_GEN_KEY failed. pseries_status=%d, rc=%d",
-		       pseries_status, rc);
 	} else {
-		rc = 0;
+		pseries_status = rc;
+		rc = pseries_status_to_err(rc);
+
+		if (rc != -EEXIST)
+			pr_err("H_PKS_GEN_KEY failed. pseries_status=%d, rc=%d",
+			       pseries_status, rc);
+		else
+			rc = 0;
 	}
 
 	kfree(label);
-- 
2.52.0