When CONFIG_PCC is disabled, pcc_mbox_request_channel() needs to
return ERR_PTR(-ENODEV), not a NULL pointer, as the callers of
this function use IS_ERR() to check for error code.

Signed-off-by: Duc Dang <dhd...@apm.com>
Signed-off-by: Hoan Tran <hot...@apm.com>
---
 include/acpi/pcc.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/acpi/pcc.h b/include/acpi/pcc.h
index 17a940a..8caa79c 100644
--- a/include/acpi/pcc.h
+++ b/include/acpi/pcc.h
@@ -21,7 +21,7 @@ extern struct mbox_chan *pcc_mbox_request_channel(struct 
mbox_client *cl,
 static inline struct mbox_chan *pcc_mbox_request_channel(struct mbox_client 
*cl,
                                                         int subspace_id)
 {
-       return NULL;
+       return ERR_PTR(-ENODEV);
 }
 static inline void pcc_mbox_free_channel(struct mbox_chan *chan) { }
 #endif
-- 
1.9.1

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