[Qemu-devel] [PATCH v2 2/6] pci: Add comment for pci_add_capability2()

[Mao Zhongyi]

Add a comment for pci_add_capability2() to explain the return
value. This may help to make a correct return value check for
its callers.

Cc: address@hidden
Cc: address@hidden
Cc: address@hidden
Suggested-by: Markus Armbruster <address@hidden>
Signed-off-by: Mao Zhongyi <address@hidden>
---
 hw/pci/pci.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 53566b8..9810d5f 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -2276,6 +2276,10 @@ int pci_add_capability(PCIDevice *pdev, uint8_t cap_id,
     return ret;
 }
 
+/*
+ * On success, pci_add_capability2() returns a positive value.
+ * On failure, it sets an error and returns a negative value.
+ */
 int pci_add_capability2(PCIDevice *pdev, uint8_t cap_id,
                        uint8_t offset, uint8_t size,
                        Error **errp)
-- 
2.9.3