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tty: tty_buffer: Fix the softlockup issues in flush_to_ldisc

Steve Best requested to merge sfbest/centos-stream-9:j32592 into main

Description:
Updates to fix tty: tty_buffer: softlockup issues in flush_to_ldisc

JIRA: https://issues.redhat.com/browse/RHEL-32592
CVE: CVE-2021-47185

Build Info: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=60552952

Tested: Successfully sanity tested tty on Intel (intel-arrowlake-s-02) system and
arm (ampere-mtsnow-altramax-01-vm-06 and ampere-mtsnow-altramax-02) systems .

Signed-off-by: Steve Best sbest@redhat.com

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