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Commit 48991e493507 ("PCI/sysfs: Ensure devices are powered for config
reads") was applied to various linux-stable trees. However, prior to
6.12.y, we do not have commit d2bd39c0456b ("PCI: Store all PCIe
Supported Link Speeds"). Therefore, we also need to apply the change to
max_link_speed_show().
This was pointed out here:
Re: Patch "PCI/sysfs: Ensure devices are powered for config reads" has been added to the 6.6-stable tree
https://lore.kernel.org/all/aPEMIreBYZ7yk3cm@google.com/
Original change description follows:
The "max_link_width", "current_link_speed", "current_link_width",
"secondary_bus_number", and "subordinate_bus_number" sysfs files all access
config registers, but they don't check the runtime PM state. If the device
is in D3cold or a parent bridge is suspended, we may see -EINVAL, bogus
values, or worse, depending on implementation details.
Wrap these access in pci_config_pm_runtime_{get,put}() like most of the
rest of the similar sysfs attributes.
Notably, "max_link_speed" does not access config registers; it returns a
cached value since d2bd39c0456b ("PCI: Store all PCIe Supported Link
Speeds").
Fixes: 56c1af4606 ("PCI: Add sysfs max_link_speed/width, current_link_speed/width, etc")
Link: https://lore.kernel.org/all/aPEMIreBYZ7yk3cm@google.com/
Signed-off-by: Brian Norris <briannorris@google.com>
Signed-off-by: Brian Norris <briannorris@chromium.org>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
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