write operations could be blocked even when using O_NONBLOCK

Solution Verified - Updated -

Issue

  • This is a backport request of a fix to 5.2.z async erratum.
  • When write operation is issued, the mutex using tty->atomic_write_lock is held at the top of do_tty_write
    
(tty_io.c).

Environment

  • Red Hat Enterprise Linux 5 Update 2
  • All architectures

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