[PATCH v2 5/6] PCI: endpoint: cleanup get_msix() callback

[Niklas Cassel <cassel@kernel.org>]

The kdoc for pci_epc_get_msix() says:
"Invoke to get the number of MSI-X interrupts allocated by the RC"
the kdoc for the callback pci_epc_ops->get_msix() says:
"ops to get the number of MSI-X interrupts allocated by the RC from the
MSI-X capability register"

pci_epc_ops->get_msix() does however return the number of interrupts
in the encoding as defined by the Table Size field.

Nowhere in the kdoc does it say that the returned number of interrupts
is in Table Size encoding.

Thus, it is very confusing that the wrapper function (pci_epc_get_msix())
and the callback function (pci_epc_ops->get_msix()) don't return the same
value.

Cleanup the API so that the wrapper function and the callback function
will have the same semantics.

Cc: <stable+noautosel@kernel.org> # this is simply a cleanup
Signed-off-by: Niklas Cassel <cassel@kernel.org>
---
 drivers/pci/controller/cadence/pcie-cadence-ep.c | 2 +-
 drivers/pci/controller/dwc/pcie-designware-ep.c  | 2 +-
 drivers/pci/endpoint/pci-epc-core.c              | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/controller/cadence/pcie-cadence-ep.c b/drivers/pci/controller/cadence/pcie-cadence-ep.c
index f307256826e6..bbb310135977 100644
--- a/drivers/pci/controller/cadence/pcie-cadence-ep.c
+++ b/drivers/pci/controller/cadence/pcie-cadence-ep.c
@@ -283,7 +283,7 @@ static int cdns_pcie_ep_get_msix(struct pci_epc *epc, u8 func_no, u8 vfunc_no)
 
 	val &= PCI_MSIX_FLAGS_QSIZE;
 
-	return val;
+	return val + 1;
 }
 
 static int cdns_pcie_ep_set_msix(struct pci_epc *epc, u8 fn, u8 vfn,
diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index e7a916bf6b2c..d74d21c42559 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -576,7 +576,7 @@ static int dw_pcie_ep_get_msix(struct pci_epc *epc, u8 func_no, u8 vfunc_no)
 
 	val &= PCI_MSIX_FLAGS_QSIZE;
 
-	return val;
+	return val + 1;
 }
 
 static int dw_pcie_ep_set_msix(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index cc012373293a..7b4a9292f801 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -352,7 +352,7 @@ int pci_epc_get_msix(struct pci_epc *epc, u8 func_no, u8 vfunc_no)
 	if (interrupt < 0)
 		return 0;
 
-	return interrupt + 1;
+	return interrupt;
 }
 EXPORT_SYMBOL_GPL(pci_epc_get_msix);
 
-- 
2.49.0