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The original code used fread(), which on some libc implementions
(ie glibc 2.17) would pre-read a full 4K (PAGE_SIZE) of the
PCI config space, when only 64 bytes were requested.
I have recently come across PCIe hardware which responds with
Completion Timeouts when accesses above 256 bytes are attempted.
This can cause server systems with GHES/AEPI support to cause
and immediate kernel panic due to the failed PCI transaction.
This change replaces the buffered fread() with an explict
unbuffered read() of 64 bytes, which corrects this issue by
only reading the guaranteed first 64 bytes of PCIe config space.
With the v221 release these APIs should be public, stable APIs, hence
let's install their headers by default now, and add their symbols to the
.sym file.
We will create the symlink on boot as a fallback to provide name
resolution. But if the symlink was removed afterwards, it most likely
should not be recreated. Creating it only on boot also solves the
issue where it would be created prematurely during installation,
before the system was actually booted.
https://bugzilla.redhat.com/show_bug.cgi?id=1197204
The parser used for MTU and Speed expects them to be size_t, not unsigned int.
This caused a corruption in the rest of the structure.
Reported by David O Neill <david.m.oneill@intel.com>.
Use strjoina to avoid error handling, and openat to simplify things.
Some fixes on the way:
- ferror does not set errno, so the return value was wrong in some cases
- errors are propagated in more cases
- EFI/systemd was created, but EFI/systemd-boot was deleted
- something is always printed on error
- when checking the version, comparison was done against "systemd-bo" for some reason
- return value was converted from negative to EXIT_SUCCESS/EXIT_FAILURE twice,
resulting in EXIT_SUCCESS all the time
