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staging: lustre: obdclass: fix race during key quiescency
Upon umount, presumably of last device using same OSD back-end, to prepare for module unload, lu_context_key_quiesce() is run to remove all module's key reference in any context linked on lu_context_remembered list. Threads must protect against such transversal processing when exiting from its context. Signed-off-by: Bruno Faccini <bruno.faccini@intel.com> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5264 Reviewed-on: http://review.whamcloud.com/13103 Reviewed-by: Mike Pershin <mike.pershin@intel.com> Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com> Reviewed-by: Oleg Drokin <oleg.drokin@intel.com> Signed-off-by: James Simmons <jsimmons@infradead.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1663,6 +1663,9 @@ void lu_context_exit(struct lu_context *ctx)
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ctx->lc_state = LCS_LEFT;
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if (ctx->lc_tags & LCT_HAS_EXIT && ctx->lc_value) {
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for (i = 0; i < ARRAY_SIZE(lu_keys); ++i) {
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/* could race with key quiescency */
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if (ctx->lc_tags & LCT_REMEMBER)
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spin_lock(&lu_keys_guard);
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if (ctx->lc_value[i]) {
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struct lu_context_key *key;
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@ -1671,6 +1674,8 @@ void lu_context_exit(struct lu_context *ctx)
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key->lct_exit(ctx,
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key, ctx->lc_value[i]);
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}
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if (ctx->lc_tags & LCT_REMEMBER)
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spin_unlock(&lu_keys_guard);
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}
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}
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}
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