[PATCH 07/15] PCI: mvebu: Do not modify PCI IO type bits in conf_write

Pali Rohár
2021-11-25T12:50:18Z

PCI IO type bits are already initialized in mvebu_pci_bridge_emul_init()
function and only when IO support is enabled. These type bits are read-only
and pci-bridge-emul.c code already does not allow to modify them from upper
layers.

When IO support is disabled then all IO registers should be read-only and
return zeros. Therefore do not modify PCI IO type bits in
mvebu_pci_bridge_emul_base_conf_write() callback.

Signed-off-by: Pali Rohár <pali@kernel.org>
Fixes: 1f08673eef12 ("PCI: mvebu: Convert to PCI emulated bridge config space")
Cc: stable@vger.kernel.org
---
drivers/pci/controller/pci-mvebu.c | 7 -------
1 file changed, 7 deletions(-)

diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
index 32694763e930..a0b661972436 100644
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -522,13 +522,6 @@ mvebu_pci_bridge_emul_base_conf_write(struct pci_bridge_emul *bridge,
break;

case PCI_IO_BASE:
- /*
- * We keep bit 1 set, it is a read-only bit that
- * indicates we support 32 bits addressing for the
- * I/O
- */
- conf->iobase |= PCI_IO_RANGE_TYPE_32;
- conf->iolimit |= PCI_IO_RANGE_TYPE_32;
mvebu_pcie_handle_iobase_change(port);
break;

--
2.20.1