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PCI: pci-bridge-emul: Make expansion ROM Base Address register read-only

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commit 1c1a3b4d3e86b997a313ffb297c1129540882859 upstream.

If expansion ROM is unsupported (which is the case of pci-bridge-emul.c
driver) then ROM Base Address register must be implemented as read-only
register that return 0 when read, same as for unused Base Address
registers.

Link: https://lore.kernel.org/r/20211124155944.1290-2-pali@kernel.org
Fixes: 23a5fba4d9 ("PCI: Introduce PCI bridge emulated config space common logic")
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pali Rohár
2021-11-24 16:59:39 +01:00
committed by Greg Kroah-Hartman
parent def2825b09
commit 2a0d437d8a
1 changed files with 6 additions and 1 deletions
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7
drivers/pci/pci-bridge-emul.c
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@@ -139,8 +139,13 @@ struct pci_bridge_reg_behavior pci_regs_behavior[PCI_STD_HEADER_SIZEOF / 4] = {
.ro = GENMASK(7, 0), .ro = GENMASK(7, 0),
}, },
/*
* If expansion ROM is unsupported then ROM Base Address register must
* be implemented as read-only register that return 0 when read, same
* as for unused Base Address registers.
*/
[PCI_ROM_ADDRESS1 / 4] = { [PCI_ROM_ADDRESS1 / 4] = {
.rw = GENMASK(31, 11) | BIT(0), .ro = ~0,
}, },
/* /*