** Summary changed:
- template
+ [SRU] Fix ice PTP crash on suspend/resume
** Description changed:
- aaaaaaaaaaaaaaaa
+ SRU Justification:
+
+ [ Impact ]
+
+ Intel E810 network adapters experience kernel NULL pointer dereference
+ crashes during system resume when PTP is enabled. This occurs due to a
+ race condition where PTP periodic work attempts to access vsi->rx_rings
+ while VSI structures are being rebuilt, causing system instability and
+ potential data loss during suspend/resume cycles.
+
+ The crash occurs in this sequence:
+ 1. System suspend triggers ice_ptp_prepare_for_reset() which cancels PTP work
+ 2. ice_ptp_rebuild() immediately queues PTP work before VSI rebuild
+ 3. PTP work executes and accesses NULL vsi->rx_rings
+ 4. System crashes with NULL pointer dereference
+
+ [ Fix ]
+
+ Cherry-pick upstream commit:
+ - 8be3a229a6112 ("ice: Fix PTP NULL pointer dereference during VSI rebuild")
+ from https://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue.git
dev-queue
+
+ The fix keeps PTP work cancelled during rebuild and only queues it after
+ VSI rebuild completes. Adds ice_ptp_queue_work() helper function to
+ encapsulate proper timing of PTP work queue.
+
+ [ Test Plan ]
+
+ 1. System with Intel E810 network adapter (ice driver)
+ 2. Enable PTP: ptp4l -i <interface> -m
+ 3. Suspend system: systemctl suspend
+ 4. Resume system
+ 5. Verify no kernel crash in dmesg (check for NULL pointer dereference in
ice_ptp_update_cached_phctime)
+ 6. Verify network connectivity restored: ping <target>
+ 7. Verify PTP synchronization working: ptp4l shows proper sync
+ 8. Repeat suspend/resume cycle multiple times to ensure stability
+
+ [ Where problems could occur ]
+
+ The patch changes when PTP work is queued during VSI rebuild. If there's
+ an error in the timing logic, PTP synchronization might be delayed after
+ resume, though the delay would be minimal (sub-second).
+
+ Risk is very low because:
+ - The fix only affects the suspend/resume path, not normal operation
+ - PTP work is still queued, just at the correct time (after VSI rebuild)
+ - The helper function includes proper state checking (ICE_PTP_READY)
+ - Change is isolated to PTP subsystem
+
+ [ Other Info ]
+
+ This issue affects systems using Intel E810 NICs with PTP enabled,
+ particularly in environments requiring frequent suspend/resume cycles
+ (laptops, power-managed servers).
+
+ The upstream commit is in the Intel Wired LAN maintainer's tree
+ (next-queue) and expected to be merged to mainline in the next cycle.
** Tags added: jira-sutton-3740 oem-priority sutton
** Also affects: linux-oem-6.17 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Resolute)
Importance: Undecided
Status: New
** Also affects: linux-oem-6.17 (Ubuntu Resolute)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Noble)
Importance: Undecided
Status: New
** Also affects: linux-oem-6.17 (Ubuntu Noble)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Questing)
Importance: Undecided
Status: New
** Also affects: linux-oem-6.17 (Ubuntu Questing)
Importance: Undecided
Status: New
** Changed in: hwe-next
Assignee: (unassigned) => AaronMa (mapengyu)
** Changed in: hwe-next
Importance: Undecided => Medium
** Changed in: linux-oem-6.17 (Ubuntu Questing)
Status: New => Invalid
** Changed in: linux-oem-6.17 (Ubuntu Resolute)
Status: New => Invalid
** Changed in: linux (Ubuntu Noble)
Status: New => Confirmed
** Changed in: linux (Ubuntu Questing)
Status: New => Confirmed
** Changed in: linux (Ubuntu Resolute)
Status: New => Confirmed
** Changed in: linux (Ubuntu Resolute)
Assignee: (unassigned) => AaronMa (mapengyu)
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https://bugs.launchpad.net/bugs/2140514
Title:
[SRU] Fix ice PTP crash on suspend/resume
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