dpll: zl3073x: use __dpll_device_change_ntf() and remove change_work

Overview

In the Linux kernel, the following vulnerability has been resolved:

dpll: zl3073x: use __dpll_device_change_ntf() and remove change_work

The change_work was introduced to send device change notifications from DPLL device callbacks without deadlocking on dpll_lock, since the callbacks are already invoked under that lock. Now that __dpll_device_change_ntf() is exported for callers that already hold dpll_lock, use it directly and remove the change_work infrastructure entirely.

This eliminates a race condition where change_work could be re-scheduled after cancel_work_sync() during device teardown, potentially causing the handler to dereference a freed or NULL dpll_dev pointer.

Affected

• Linux >= 9363b4837659d1b7ee04cfa714373ce4b4b8269f < e7a33807fb3f87a855993474ac21684ce105927b
• Linux >= 9363b4837659d1b7ee04cfa714373ce4b4b8269f < d733f519f6443540f8359461a34e3b0042099bbe
• Linux 6.18

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.