Comment 12 for bug 2065927

Reviewed: https://review.opendev.org/c/openstack/nova/+/922984
Committed: https://opendev.org/openstack/nova/commit/1581f6695f00c6b4fb694b6e946a4ed204c1680f
Submitter: "Zuul (22348)"
Branch: stable/2024.1

commit 1581f6695f00c6b4fb694b6e946a4ed204c1680f
Author: Sean Mooney <email address hidden>
Date: Wed May 22 18:59:02 2024 +0100

    retry write_sys call on device busy

    This change adds a retry_if_busy decorator
    to the read_sys and write_sys functions in the filesystem
    module that will retry reads and writes up to 5 times with
    an linear backoff.

    This allows nova to tolerate short periods of time where
    sysfs retruns device busy. If the reties are exausted
    and offlineing a core fails a warning is log and the failure is
    ignored. onling a core is always treated as a hard error if
    retries are exausted.

    Closes-Bug: #2065927
    Change-Id: I2a6a9f243cb403167620405e167a8dd2bbf3fa79
    (cherry picked from commit 44c1b48b3121682cf959c90b3adaf2a3f92e318c)