Summary

In the shutdown path the vbus lock is dropped, LDM command pools are freed and adapter handles kfree'd, but the periodic vbus timer (callout_init_lk'd to the vbus lock, armed for background RAID/rebuild tasks) is only terminated AFTERWARDS. A timer callback firing in the window executes LDM code over freed command structures. Shutdown-time crash when a rebuild/verify has the timer armed. Terminate-before-free fix.