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On receipt of a namespace attribute changed AER, we acquire the namespace mutex lock before proceeding to scan and validate the namespace list. In case of namespace detach/delete command, nvme_ns_remove function deadlocks trying to acquire the already held lock. All callers, except nvme_remove_namespaces(), of nvme_ns_remove() already held namespaces_mutex. So we can simply fix the deadlock by not acquiring the mutex in nvme_ns_remove() and acquiring it in nvme_remove_namespaces(). Reported-by: Sunad Bhandary S <sunad.s@samsung.com> Signed-off-by: Ming Lin <ming.l@ssi.samsung.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Sagi Grimerg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com> |
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