wifi: rtw89: pci: add .shutdown callback to stop rfkill polling on reboot

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Summary

CVECVE-2026-80939
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:18:58 UTC
Updated2026-09-11 20:18:58 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: wifi: rtw89: pci: add .shutdown callback to stop rfkill polling on reboot Since the hardware rfkill polling was introduced, arm64 platforms can panic with an asynchronous SError during warm reboot: SError Interrupt on CPU8, code 0x00000000be000011 -- SError Workqueue: events_power_efficient rfkill_poll [rfkill] rtw89_pci_ops_read8+0x94/0x160 [rtw89_pci] rtw89_core_rfkill_poll+0x50/0x1e0 [rtw89_core] rtw89_ops_rfkill_poll+0x40/0x68 [rtw89_core] ieee80211_rfkill_poll+0x3c/0x70 [mac80211] cfg80211_rfkill_poll+0x40/0x2a0 [cfg80211] rfkill_poll+0x30/0x88 [rfkill] Kernel panic - not syncing: Asynchronous SError Interrupt On the reboot path the kernel only runs device_shutdown(), which calls each driver's .shutdown callback; .remove is not invoked. The rtw89 PCI driver had no .shutdown callback, so nothing stopped the rfkill polling work while the platform was tearing the PCIe link down. Once the link is gone, the next MMIO read from the poll handler targets a non-responding device and is reported as a fatal asynchronous SError on arm64. Add rtw89_pci_shutdown(), wired to all rtw89 PCI device drivers, which sets a new RTW89_FLAG_SHUTDOWN flag (mirroring the USB RTW89_FLAG_UNPLUGGED pattern). When the flag is set, rtw89_ops_rfkill_poll() returns early, so no MMIO read is issued to the chip after shutdown begins and the SError no longer occurs. This does not call the full .remove path from .shutdown, to keep the shutdown handler minimal and avoid running the non-idempotent teardown twice.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0b38e6277aed8a59ccb64fcc1172d962c1f11b4c c1f214dd1351244156deb57761b14190a233aef6 git Not specified
CNA Linux Linux affected 0b38e6277aed8a59ccb64fcc1172d962c1f11b4c 667c12782aaf8dd3cb2213e528fe63a73cb63345 git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/667c12782aaf8dd3cb2213e528fe63a73cb63345 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c1f214dd1351244156deb57761b14190a233aef6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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