[RFC PATCH 17/21] PCI: endpoint: *_free_bar() to return error codes on failure

[Kishon Vijay Abraham I]

Modify pci_epc_get_next_free_bar() and pci_epc_get_first_free_bar() to
return error values if there are no free BARs available.

Signed-off-by: Kishon Vijay Abraham I <kis...@ti.com>
---
 drivers/pci/endpoint/pci-epc-core.c | 9 ++++-----
 include/linux/pci-epc.h             | 7 +++----
 2 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/pci/endpoint/pci-epc-core.c 
b/drivers/pci/endpoint/pci-epc-core.c
index 33c745546a42..a93c78488bca 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -173,8 +173,7 @@ EXPORT_SYMBOL_GPL(of_pci_epc_get_by_name);
  * Invoke to get the first unreserved BAR that can be used by the endpoint
  * function. For any incorrect value in reserved_bar return '0'.
  */
-unsigned int pci_epc_get_first_free_bar(const struct pci_epc_features
-                                       *epc_features)
+int pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features)
 {
        return pci_epc_get_next_free_bar(epc_features, BAR_0);
 }
@@ -188,8 +187,8 @@ EXPORT_SYMBOL_GPL(pci_epc_get_first_free_bar);
  * Invoke to get the next unreserved BAR starting from @bar that can be used
  * for endpoint function. For any incorrect value in reserved_bar return '0'.
  */
-unsigned int pci_epc_get_next_free_bar(const struct pci_epc_features
-                                      *epc_features, enum pci_barno bar)
+int pci_epc_get_next_free_bar(const struct pci_epc_features
+                             *epc_features, enum pci_barno bar)
 {
        unsigned long free_bar;
 
@@ -209,7 +208,7 @@ unsigned int pci_epc_get_next_free_bar(const struct 
pci_epc_features
 
        free_bar = find_next_zero_bit(&free_bar, 6, bar);
        if (free_bar > 5)
-               return 0;
+               return -EINVAL;
 
        return free_bar;
 }
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index 0632a4d4714d..ad8021b0efb7 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -227,10 +227,9 @@ void pci_epc_of_parse_header(struct device_node *node,
                             struct pci_epf_header *header);
 const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
                                                    u8 func_no, u8 vfunc_no);
-unsigned int pci_epc_get_first_free_bar(const struct pci_epc_features
-                                       *epc_features);
-unsigned int pci_epc_get_next_free_bar(const struct pci_epc_features
-                                      *epc_features, enum pci_barno bar);
+int pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features);
+int pci_epc_get_next_free_bar(const struct pci_epc_features
+                             *epc_features, enum pci_barno bar);
 struct pci_epc *pci_epc_get(const char *epc_name);
 void pci_epc_put(struct pci_epc *epc);
 struct pci_epc *of_pci_epc_get(struct device_node *node, int index);
-- 
2.17.1