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>

7 files changed, 16 insertions, 8 deletions

diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index fa71fea3b6ee..9ab52e27cf71 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -282,6 +282,14 @@ extern int opal_error_code(int rc);
 
 ssize_t opal_msglog_copy(char *to, loff_t pos, size_t count);
 
+static inline int opal_get_async_rc(struct opal_msg msg)
+{
+        if (msg.msg_type != OPAL_MSG_ASYNC_COMP)
+                return OPAL_PARAMETER;
+        else
+                return be64_to_cpu(msg.params[1]);
+}
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* _ASM_POWERPC_OPAL_H */
diff --git a/arch/powerpc/platforms/powernv/opal-sensor.c b/arch/powerpc/platforms/powernv/opal-sensor.c
index a06059df9239..308efd170c27 100644
--- a/arch/powerpc/platforms/powernv/opal-sensor.c
+++ b/arch/powerpc/platforms/powernv/opal-sensor.c
@@ -55,7 +55,7 @@ int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data)
                         goto out_token;
                 }
 
-                ret = opal_error_code(be64_to_cpu(msg.params[1]));
+                ret = opal_error_code(opal_get_async_rc(msg));
                 *sensor_data = be32_to_cpu(data);
                 break;
 
diff --git a/arch/powerpc/platforms/powernv/opal-sysparam.c b/arch/powerpc/platforms/powernv/opal-sysparam.c
index afe66c576a38..23fb6647dced 100644
--- a/arch/powerpc/platforms/powernv/opal-sysparam.c
+++ b/arch/powerpc/platforms/powernv/opal-sysparam.c
@@ -67,7 +67,7 @@ static ssize_t opal_get_sys_param(u32 param_id, u32 length, void *buffer)
                 goto out_token;
         }
 
-        ret = opal_error_code(be64_to_cpu(msg.params[1]));
+        ret = opal_error_code(opal_get_async_rc(msg));
 
 out_token:
         opal_async_release_token(token);
@@ -103,7 +103,7 @@ static int opal_set_sys_param(u32 param_id, u32 length, void *buffer)
                 goto out_token;
         }
 
-        ret = opal_error_code(be64_to_cpu(msg.params[1]));
+        ret = opal_error_code(opal_get_async_rc(msg));
 
 out_token:
         opal_async_release_token(token);
diff --git a/drivers/i2c/busses/i2c-opal.c b/drivers/i2c/busses/i2c-opal.c
index 75dd6d041241..11e2a1fc10e9 100644
--- a/drivers/i2c/busses/i2c-opal.c
+++ b/drivers/i2c/busses/i2c-opal.c
@@ -71,7 +71,7 @@ static int i2c_opal_send_request(u32 bus_id, struct opal_i2c_request *req)
         if (rc)
                 goto exit;
 
-        rc = be64_to_cpu(msg.params[1]);
+        rc = opal_get_async_rc(msg);
         if (rc != OPAL_SUCCESS) {
                 rc = i2c_opal_translate_error(rc);
                 goto exit;
diff --git a/drivers/leds/leds-powernv.c b/drivers/leds/leds-powernv.c
index dfb8bd390125..b2a98c7b521b 100644
--- a/drivers/leds/leds-powernv.c
+++ b/drivers/leds/leds-powernv.c
@@ -118,7 +118,7 @@ static int powernv_led_set(struct powernv_led_data *powernv_led,
                 goto out_token;
         }
 
-        rc = be64_to_cpu(msg.params[1]);
+        rc = opal_get_async_rc(msg);
         if (rc != OPAL_SUCCESS)
                 dev_err(dev, "%s : OAPL async call returned failed [rc=%d]\n",
                         __func__, rc);
diff --git a/drivers/mtd/devices/powernv_flash.c b/drivers/mtd/devices/powernv_flash.c
index d5b870b3fd4e..f5396f26ddb4 100644
--- a/drivers/mtd/devices/powernv_flash.c
+++ b/drivers/mtd/devices/powernv_flash.c
@@ -95,7 +95,7 @@ static int powernv_flash_async_op(struct mtd_info *mtd, enum flash_op op,
                 return -EIO;
         }
 
-        rc = be64_to_cpu(msg.params[1]);
+        rc = opal_get_async_rc(msg);
         if (rc == OPAL_SUCCESS) {
                 rc = 0;
                 if (retlen)
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;