[RTEMS Project] #4956: Deadlock caused by locking inversion in JFFS2

[RTEMS trac]

#4956: Deadlock caused by locking inversion in JFFS2
---------------------------+--------------------
  Reporter:  Kinsey Moore  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  normal        |  Milestone:  6.1
 Component:  admin         |    Version:
  Severity:  normal        |   Keywords:
Blocked By:                |   Blocking:
---------------------------+--------------------
 When the code for delayed writes was added to support JFFS2 on NAND, it
 introduced a possible locking inversion when managing the delayed write
 work queue.

 This has been partially addressed by
 fa85760c99a72b8186c70c896b98efe0d7cde2b6, but there are other issues with
 this code that need to be addressed as well.

 First is that when not compiling with RTEMS_DEBUG, nodes are not
 automatically set as off the chain upon extraction and this behavior is
 depended upon.

 Second is that protected (ISR-locked) chain calls are used when they are
 not necessary due to already being locked.

 Third is that the bug fixed by the referenced commit needs a test that
 verifies the fix.

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Ticket URL: <http://devel.rtems.org/ticket/4956>
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