tree 6494bb165a918f418e7db6ca459d8cd66575f578
parent 6e0dd4e4ffd850d48849907c815fbef50092aa17
author Angel Pons <th3fanbus@gmail.com> 1624191344 +0200
committer Patrick Georgi <pgeorgi@google.com> 1624337240 +0000

nb/intel/haswell/pcie.c: Avoid needless death

Using `config_of(dev)` to access `dev->chip_info` will make coreboot die
if the latter is NULL, which is the case for devices detected at runtime
(i.e. not statically declared in the devicetree). Given that the code is
designed to work when the PEG config is all-zeroes (devicetree default),
dying because `dev->chip_info` is NULL is foolish and unwarranted.

Introduce a helper function that returns a pointer to devicetree config
when available, and otherwise returns a pointer to a zero-filled static
struct. In addition, avoid an out-of-bounds access in the very unlikely
case where the device's function is too large.

Tested on Asrock B85M Pro4, can now boot when `device pci 01.0 on end`
is commented out in its devicetree. Without this commit, it could not.

Change-Id: Ia2d3a03da9eab601fb834b0c51a8a51c9ae14c33
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55690
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>