01f769c62a
Checking if destruct is false and setting destruct to true are separated by mutex in remove_cb() and bdev_nvme_library_fini(). It was possible that multiple threads called nvme_bdev_ctrlr_destruct() because the caller could call nvme_bdev_ctrlr_destruct() before setting destruct to true after knowing it was false. This patch ensures that nvme_bdev_ctrlr_destruct() is called only once. Set ctrlr->destruct to true without releasing mutex after checking if ctrlr->destruct is false. If destruct is set to true before calling nvme_ctrlr_depopulate_namespaces(), nvme_ctrlr_depopulate_namespace_done() may call nvme_bdev_ctrlr_destruct() because it is likely that reference count is zero and destruct is true. In this case, remove_cb() or bdev_nvme_library_fini() cannot call nvme_bdev_destruct() after returning from nvme_ctrlr_depopulate_namespaces(). On the other hand, if a controller has no namespace, nvme_ctrlr_depopulate_namespaces() does nothing and nvme_ctrlr_depopulate_namespace_done() is not called. Hence remove_cb() or bdev_nvme_library_fini() has to call nvme_bdev_destruct() after returning nvme_ctrlr_depopulate_namespaces(). To unify both cases, initialize reference count to one as a sentinel value and remove_cb() and bdev_nvme_library_fini() decrement reference count and then calls nvme_bdev_ctrlr_destruct() if reference count is zero after returning from nvme_ctrlr_depopulate_namespaces(). Additionally, add assert to check if reference count is not negative to find bug in future. Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com> Change-Id: I8a617b5aa4d0a9faff832e63c2ed4b353341dd6b Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/4817 Community-CI: Broadcom CI Community-CI: Mellanox Build Bot Reviewed-by: Changpeng Liu <changpeng.liu@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com> Reviewed-by: Aleksey Marchuk <alexeymar@mellanox.com> Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> |
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| .. | ||
| accel | ||
| bdev | ||
| blob | ||
| blobfs | ||
| env_dpdk | ||
| event | ||
| sock | ||
| Makefile | ||