[RFC PATCH v2 0/4] Remove unncessary linked list from aspm.c

From: Saheed O. Bolarinwa
Date: Tue Sep 28 2021 - 20:43:30 EST

From: "Bolarinwa O. Saheed" <refactormyself@xxxxxxxxx>

An extra linked list is created inside aspm.c to keep track of devices
on which the link state was enabled. However, it is possible to access
them via existing device lists.

This series remove the extra linked list and other related members of
the struct pcie_link_state: `root`, `parent` and `downstream`. All
these are now either calculated or obtained directly when needed.

- v2:
» - Avoid using BUG_ON()
» - Create helper function pci_get_parent()
» - Fix a bug from the previous version

These series are based on
» 'commit e4e737bb5c17 ("Linux 5.15-rc2")'

Bolarinwa O. Saheed (4):
PCI/ASPM: Remove struct pcie_link_state.parent
PCI/ASPM: Remove struct pcie_link_state.root
PCI/ASPM: Remove struct pcie_link_state.downstream
PCI/ASPM: Remove unncessary linked list from aspm.c

drivers/pci/pcie/aspm.c | 134 +++++++++++++++++++++++-----------------
1 file changed, 78 insertions(+), 56 deletions(-)