This is a note to let you know that I've just added the patch titled PCI: pci-bridge-emul: Make expansion ROM Base Address register read-only to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: pci-pci-bridge-emul-make-expansion-rom-base-address-register-read-only.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 1c1a3b4d3e86b997a313ffb297c1129540882859 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@xxxxxxxxxx> Date: Wed, 24 Nov 2021 16:59:39 +0100 Subject: PCI: pci-bridge-emul: Make expansion ROM Base Address register read-only MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Pali Rohár <pali@xxxxxxxxxx> 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@xxxxxxxxxx Fixes: 23a5fba4d941 ("PCI: Introduce PCI bridge emulated config space common logic") Signed-off-by: Pali Rohár <pali@xxxxxxxxxx> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/pci/pci-bridge-emul.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/drivers/pci/pci-bridge-emul.c +++ b/drivers/pci/pci-bridge-emul.c @@ -139,8 +139,13 @@ struct pci_bridge_reg_behavior pci_regs_ .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] = { - .rw = GENMASK(31, 11) | BIT(0), + .ro = ~0, }, /* Patches currently in stable-queue which might be from pali@xxxxxxxxxx are queue-5.15/pci-pci-bridge-emul-make-expansion-rom-base-address-register-read-only.patch queue-5.15/pci-pci-bridge-emul-fix-definitions-of-reserved-bits.patch queue-5.15/pci-pci-bridge-emul-correctly-set-pcie-capabilities.patch queue-5.15/pci-pci-bridge-emul-properly-mark-reserved-pcie-bits-in-pci-config-space.patch queue-5.15/pci-pci-bridge-emul-set-pci_status_cap_list-for-pcie-device.patch queue-5.15/arm-dts-armada-38x-add-generic-compatible-to-uart-no.patch