[PATCH] drm/i915: check status and reply value both in skl_pcode_try_request()

[Weinan Li]

skl_pcode_try_request() call sandybridge_pcode_read(), check both return
status and value simultanously, ensure it got correct value without error.

Signed-off-by: Weinan Li <weinan.z.li at intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index ae2c0bb..e7b12ec 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -7882,7 +7882,7 @@ static bool skl_pcode_try_request(struct drm_i915_private *dev_priv, u32 mbox,
 
 	*status = sandybridge_pcode_read(dev_priv, mbox, &val);
 
-	return *status || ((val & reply_mask) == reply);
+	return (!*status) && ((val & reply_mask) == reply);
 }
 
 /**
-- 
1.9.1