pci_epc_get_first_free_bar() uses only "reserved_bar" member in
epc_features to get the first unreserved BAR. However if the
reserved BAR is also a 64-bit BAR, then the next BAR shouldn't be
returned (since 64-bit BAR uses two BARs).
Make pci_epc_get_first_free_bar() take into account 64 bit BAR while
returning the first free unreserved BAR.
Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
---
drivers/pci/endpoint/pci-epc-core.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 177a3fc1a0dd..49bffa2349c5 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -153,12 +153,20 @@ EXPORT_SYMBOL_GPL(of_pci_epc_get_by_name);
unsigned int pci_epc_get_first_free_bar(const struct pci_epc_features
*epc_features)
{
- int free_bar;
+ unsigned long free_bar;
if (!epc_features)
return 0;
- free_bar = ffz(epc_features->reserved_bar);
+ /* Find if the reserved BAR is also a 64-bit BAR */
+ free_bar = epc_features->reserved_bar & epc_features->bar_fixed_64bit;
+
+ /* Set the adjacent bit if the reserved BAR is also a 64-bit BAR */
+ free_bar <<= 1;
+ free_bar |= epc_features->reserved_bar;
+
+ /* Now find the free BAR */
+ free_bar = ffz(free_bar);
if (free_bar > 5)
return 0;
--
2.17.1
