powerpc/opal: Add inline function to get rc from an ASYNC_COMP opal_msg

An opal_msg of type OPAL_MSG_ASYNC_COMP contains the return code in the
params[1] struct member. However this isn't intuitive or obvious when
reading the code and requires that a user look at the skiboot
documentation or opal-api.h to verify this.

Add an inline function to get the return code from an opal_msg and update
call sites accordingly.

Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/rtc/rtc-opal.c b/drivers/rtc/rtc-opal.c
index 9c18d6fd8107..ea20f627dabe 100644
--- a/drivers/rtc/rtc-opal.c
+++ b/drivers/rtc/rtc-opal.c
@@ -134,7 +134,7 @@ static int opal_get_tpo_time(struct device *dev, struct rtc_wkalrm *alarm)
                 goto exit;
         }
 
-        rc = be64_to_cpu(msg.params[1]);
+        rc = opal_get_async_rc(msg);
         if (rc != OPAL_SUCCESS) {
                 rc = -EIO;
                 goto exit;
@@ -181,7 +181,7 @@ static int opal_set_tpo_time(struct device *dev, struct rtc_wkalrm *alarm)
                 goto exit;
         }
 
-        rc = be64_to_cpu(msg.params[1]);
+        rc = opal_get_async_rc(msg);
         if (rc != OPAL_SUCCESS)
                 rc = -EIO;