[LU-12431] Close race on cp_state changes

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.13.0
• Environment: Affects aarch64
• Severity: 2
• Assignee: Shaun Tancheff
• Reporter: Shaun Tancheff

Description

Close a race on cp_state changes per discussion on lustre-devel

http://lists.lustre.org/pipermail/lustre-devel-lustre.org/2019-June/008860.html

Migrate wait_event / wake_up changes from upstream cl_sync_io_wait() / cl_sync_io_note().

Issue Links

• is related to: LU-12362 kernel warning 'do not call blocking ops when !TASK_RUNNING ' in ptlrpcd