[PATCH v4 04/17] PCI: endpoint: Make *_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/functions/pci-epf-test.c |  2 ++
 drivers/pci/endpoint/pci-epc-core.c           | 12 ++++++------
 include/linux/pci-epc.h                       |  8 ++++----
 include/linux/pci-epf.h                       |  1 +
 4 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c 
b/drivers/pci/endpoint/functions/pci-epf-test.c
index e4e51d884553..7a1f3abfde48 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -834,6 +834,8 @@ static int pci_epf_test_bind(struct pci_epf *epf)
                linkup_notifier = epc_features->linkup_notifier;
                core_init_notifier = epc_features->core_init_notifier;
                test_reg_bar = pci_epc_get_first_free_bar(epc_features);
+               if (test_reg_bar < 0)
+                       return -EINVAL;
                pci_epf_configure_bar(epf, epc_features);
        }
 
diff --git a/drivers/pci/endpoint/pci-epc-core.c 
b/drivers/pci/endpoint/pci-epc-core.c
index 1afe5d9afb0d..ea7e7465ce7a 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -90,8 +90,8 @@ EXPORT_SYMBOL_GPL(pci_epc_get);
  * 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)
+enum pci_barno
+pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features)
 {
        return pci_epc_get_next_free_bar(epc_features, BAR_0);
 }
@@ -105,13 +105,13 @@ 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)
+enum pci_barno pci_epc_get_next_free_bar(const struct pci_epc_features
+                                        *epc_features, enum pci_barno bar)
 {
        unsigned long free_bar;
 
        if (!epc_features)
-               return 0;
+               return BAR_0;
 
        /* If 'bar - 1' is a 64-bit BAR, move to the next BAR */
        if ((epc_features->bar_fixed_64bit << 1) & 1 << bar)
@@ -126,7 +126,7 @@ 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 NO_BAR;
 
        return free_bar;
 }
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index cfe9b427e6b7..88d311bad984 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -201,10 +201,10 @@ int pci_epc_start(struct pci_epc *epc);
 void pci_epc_stop(struct pci_epc *epc);
 const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
                                                    u8 func_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);
+enum pci_barno
+pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features);
+enum pci_barno 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);
 
diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
index 6644ff3b0702..fa3aca43eb19 100644
--- a/include/linux/pci-epf.h
+++ b/include/linux/pci-epf.h
@@ -21,6 +21,7 @@ enum pci_notify_event {
 };
 
 enum pci_barno {
+       NO_BAR = -1,
        BAR_0,
        BAR_1,
        BAR_2,
-- 
2.17.1