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).
Red Bear OS
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