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PCI: endpoint: Make sure that BAR_5 does not have 64-bit flag set when clearing

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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_clear_bar(), so that we don't need
to do this sanity check in all epc->ops->clear_bar() implementations.

Signed-off-by: Niklas Cassel <[email protected]>
Signed-off-by: Lorenzo Pieralisi <[email protected]>
Acked-by: Kishon Vijay Abraham I <[email protected]>
This commit is contained in:
Niklas Cassel 2018-03-28 13:50:15 +02:00 • committed by Lorenzo Pieralisi
commit 6474a4e554
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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@ -285,7 +285,9 @@ void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no,
{
unsigned long 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;
if (!epc->ops->clear_bar)