nvme: fix RCU hole that allowed for endless looping in multipath round robin

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Make nvme_ns_remove match the assumptions elsewhere.

1) !NVME_NS_READY needs to be srcu synchronized to make sure nothing is
   running in __nvme_find_path or nvme_round_robin_path that will
   re-assign this ns to current_path.

2) Any matching current_path entries need to be cleared before removing
   from the siblings list, to prevent calling nvme_round_robin_path with
   an "old" ns that's off list.

3) Finally the list_del_rcu can happen, and then synchronize again
   before releasing any reference counts.

Signed-off-by: Christoph Hellwig <hch@lst.de>

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Chris Leech 2022-03-21 15:43:04 -07:00 • committed by Christoph Hellwig

parent 5974ea7ce0

commit d6d6742772

1 changed files with 10 additions and 4 deletions

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drivers/nvme/host/core.c

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