Apply the same release/acquire fence pattern as e1000d and
rtl8168d:
- acquire fence before reading the RX status / length / data
bytes, so the compiler does not reorder the buffer reads
past the rxsts observation on weakly-ordered architectures.
- release fence before the CAPR write (RX doorbell) so the
device sees the buffer reads before the doorbell signals
the consumer is done with the ring.
- release fence before the TSD write (TX doorbell) so the
device sees the buffer writes before claiming ownership of
the descriptor.
The 8139 is a legacy 100 Mb/s chip with a 64 KB ring rather
than a 16-entry descriptor table, but the same hand-off
semantics apply: ownership bit is cleared on read, set on
write, and the device accesses buffer memory after the doorbell.
The fences are the same compiler-level ordering the Linux
8139too driver places around its MMIO writes; the 8139 chip
itself does not need anything more.
Continuation of 92924224 — the same conditional-ack bug class found in
six more drivers: a foreign interrupt on a shared INTx line skipped the
write-back ack, leaving the kernel-masked IRQ line dead forever.
- sb16d, ac97d: ack before the not-ours continue
- rtl8139d, rtl8168d, ixgbed: ack unconditionally, tick only when ours
(the stale 'TODO: spurious interrupts' comments removed — the
spurious-interrupt confusion was this bug)
- ihdgd: ack unconditionally, handle_events/tick only when ours
Verified: cargo check -Z build-std --target x86_64-unknown-redox for
sb16d, ac97d, rtl8139d, rtl8168d, ixgbed, ihdgd — clean, no new
warnings. nvmed audited: not affected (per-queue MSI pattern, no
conditional ack).
Per local/docs/PATCH-PRESERVATION-AUDIT-2026-07-12.md the base
fork was carrying only 38 of 100 patches in local/patches/base/.
The other 62 patches' content was silently missing from the fork
working tree, even though their .patch files were preserved.
This commit re-applies 41 patches that genuinely still apply
cleanly + 17 hunks that partially applied. Recovery covers:
- D-Bus initfs service wiring (P4-initfs-dbus-services)
- USB service wiring (P4-initfs-usb-drm-services)
- netcfg/dhcp/dhcpv6 driver fixes
- acpid shutdown/PM/quirk fixes
- inputd/ps2d hard-fail logging
- pcid driver interface refinements (server cmd channel)
- virtio-core for VirtualBox support
- ixgbed/rtl8139/rtl8168 net drivers
- ahcid NCQ + per-function interrupt coalescing
- logd persistent logging
- bootstrap procmgr race-condition fixes
- cargo version pin to +rb0.3.0 (synchronized release branch)
58 files changed, +1444/-318 lines.
Untracked mnt/ tree and *.orig / *.rej files cleaned up after
patch application (leftover from absolute-path patch headers).
Red Bear OS