This mini-series of two patches avoids that the device mapper
implementation can trigger a use-after-free during removal of a
mapped device. The two patches in this series are:
- block: Convert blk_run_queue() recursion into iteration.
- dm: Avoid running the md queue after the last dm_put().
Note: these patches are the result of source reading. As far as I know
this issue has not (yet) caused any harm.
Changes compared to v1:
- Invoking blk_run_queue() again guarantees that the queue will be run
sooner or later.
- Refined patch descriptions and source code comments.
- Left out the "Cc: <stable@xxxxxxxxxxxxxxx>" tags.
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