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

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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>
This commit is contained in:
Niklas Cassel 2018-03-28 13:50:08 +02:00 committed by Lorenzo Pieralisi
parent bc4a48976f
commit f16b1f6fdf
1 changed files with 3 additions and 1 deletions
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4
drivers/pci/endpoint/pci-epc-core.c
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@ -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)