[PATCH] PCI: endpoint: Return error code when callback is not implemented

[Rick Wertenbroek <rick.wertenbroek@gmail.com>]

Return an error code when the callback for an endpoint controller
function is not implemented (is null). Among all the functions, only
map_msi_irq() had an error returned if the callback was null. Extend
this error handling to other functions as well.

Signed-off-by: Rick Wertenbroek <rick.wertenbroek@gmail.com>
---
 drivers/pci/endpoint/pci-epc-core.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 5a4a8b0be626..14f4256b9410 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -196,7 +196,7 @@ int pci_epc_start(struct pci_epc *epc)
 		return -EINVAL;
 
 	if (!epc->ops->start)
-		return 0;
+		return -EINVAL;
 
 	mutex_lock(&epc->lock);
 	ret = epc->ops->start(epc);
@@ -228,7 +228,7 @@ int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
 		return -EINVAL;
 
 	if (!epc->ops->raise_irq)
-		return 0;
+		return -EINVAL;
 
 	mutex_lock(&epc->lock);
 	ret = epc->ops->raise_irq(epc, func_no, vfunc_no, type, interrupt_num);
@@ -340,7 +340,7 @@ int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 vfunc_no, u8 interrupts)
 		return -EINVAL;
 
 	if (!epc->ops->set_msi)
-		return 0;
+		return -EINVAL;
 
 	encode_int = order_base_2(interrupts);
 
@@ -408,7 +408,7 @@ int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
 		return -EINVAL;
 
 	if (!epc->ops->set_msix)
-		return 0;
+		return -EINVAL;
 
 	mutex_lock(&epc->lock);
 	ret = epc->ops->set_msix(epc, func_no, vfunc_no, interrupts - 1, bir,
@@ -469,7 +469,7 @@ int pci_epc_map_addr(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
 		return -EINVAL;
 
 	if (!epc->ops->map_addr)
-		return 0;
+		return -EINVAL;
 
 	mutex_lock(&epc->lock);
 	ret = epc->ops->map_addr(epc, func_no, vfunc_no, phys_addr, pci_addr,
@@ -537,7 +537,7 @@ int pci_epc_set_bar(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
 		return -EINVAL;
 
 	if (!epc->ops->set_bar)
-		return 0;
+		return -EINVAL;
 
 	mutex_lock(&epc->lock);
 	ret = epc->ops->set_bar(epc, func_no, vfunc_no, epf_bar);
@@ -575,7 +575,7 @@ int pci_epc_write_header(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
 		return -EINVAL;
 
 	if (!epc->ops->write_header)
-		return 0;
+		return -EINVAL;
 
 	mutex_lock(&epc->lock);
 	ret = epc->ops->write_header(epc, func_no, vfunc_no, header);
-- 
2.25.1