The pci_enable_link_state() helper is currently only called from pci_walk_bus(), something which can lead to a deadlock as both helpers take a pci_bus_sem read lock. Add a new locked helper which can be called with the read lock held and fix up the two current users (the second is new in 6.7-rc1). Note that there are no users left of the original unlocked variant after this series, but I decided to leave it in place for now (e.g. to mirror the corresponding helpers to disable link states). Included are also a couple of related cleanups. Johan Changes in v2 - fix up the function name in a kernel doc comment as reported by the kernel test robot <lkp@xxxxxxxxx> Johan Hovold (6): PCI/ASPM: Add locked helper for enabling link state PCI: vmd: Fix deadlock when enabling ASPM PCI: qcom: Fix deadlock when enabling ASPM PCI: qcom: Clean up ASPM comment PCI/ASPM: Clean up disable link state parameter PCI/ASPM: Add lockdep assert to link state helper drivers/pci/controller/dwc/pcie-qcom.c | 7 ++- drivers/pci/controller/vmd.c | 2 +- drivers/pci/pcie/aspm.c | 65 +++++++++++++++++++------- include/linux/pci.h | 3 ++ 4 files changed, 56 insertions(+), 21 deletions(-) -- 2.41.0
