From 91171c3414c6c69b580875ade6c84573f2a52977 Mon Sep 17 00:00:00 2001 From: Bruno Faccini Date: Sun, 2 Oct 2016 22:27:57 -0400 Subject: [PATCH] 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 Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5264 Reviewed-on: http://review.whamcloud.com/13103 Reviewed-by: Mike Pershin Reviewed-by: Alex Zhuravlev Reviewed-by: Oleg Drokin Signed-off-by: James Simmons Signed-off-by: Greg Kroah-Hartman --- drivers/staging/lustre/lustre/obdclass/lu_object.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/staging/lustre/lustre/obdclass/lu_object.c b/drivers/staging/lustre/lustre/obdclass/lu_object.c index 054e567..f0e74c6 100644 --- a/drivers/staging/lustre/lustre/obdclass/lu_object.c +++ b/drivers/staging/lustre/lustre/obdclass/lu_object.c @@ -1663,6 +1663,9 @@ void lu_context_exit(struct lu_context *ctx) ctx->lc_state = LCS_LEFT; if (ctx->lc_tags & LCT_HAS_EXIT && ctx->lc_value) { for (i = 0; i < ARRAY_SIZE(lu_keys); ++i) { + /* could race with key quiescency */ + if (ctx->lc_tags & LCT_REMEMBER) + spin_lock(&lu_keys_guard); if (ctx->lc_value[i]) { struct lu_context_key *key; @@ -1671,6 +1674,8 @@ void lu_context_exit(struct lu_context *ctx) key->lct_exit(ctx, key, ctx->lc_value[i]); } + if (ctx->lc_tags & LCT_REMEMBER) + spin_unlock(&lu_keys_guard); } } } -- 2.7.4