PCI: endpoint: Setting BAR_5 to 64-bits wide is invalid

Since a 64-bit BAR consists of a BAR pair, and since there is no
BAR after BAR_5, BAR_5 cannot be 64-bits wide.

This sanity check is done in pci_epc_set_bar(), so that we don't need
to do this sanity check in all epc->ops->set_bar() implementations.

Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 784e33d..109d75f 100644 (file)
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -310,7 +310,9 @@ int pci_epc_set_bar(struct pci_epc *epc, u8 func_no,
        int ret;
        unsigned long irq_flags;
 
-       if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
+       if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
+           (epf_bar->barno == BAR_5 &&
+            epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64))
                return -EINVAL;
 
        if (!epc->ops->set_bar)