From 1813e80ef7833579ba7a802781a66361a3d8906d Mon Sep 17 00:00:00 2001 From: Sagi Grimberg Date: Mon, 19 May 2014 17:44:23 +0300 Subject: [PATCH] Target/iser: Fix hangs in connection teardown commit 9d49f5e284e700576f3b65f1e28dea8539da6661 upstream. In ungraceful teardowns isert close flows seem racy such that isert_wait_conn hangs as RDMA_CM_EVENT_DISCONNECTED never gets invoked (no one called rdma_disconnect). Both graceful and ungraceful teardowns will have rx flush errors (isert posts a batch once connection is established). Once all flush errors are consumed we invoke isert_wait_conn and it will be responsible for calling rdma_disconnect. This way it can be sure that rdma_disconnect was called and it won't wait forever. This patch also removes the logout_posted indicator. either the logout completion was consumed and no problem decrementing the post_send_buf_count, or it was consumed as a flush error. no point of keeping it for isert_wait_conn as there is no danger that isert_conn will be accidentally removed while it is running. (Drop unnecessary sleep_on_conn_wait_comp check in isert_cq_rx_comp_err - nab) Signed-off-by: Sagi Grimberg Signed-off-by: Nicholas Bellinger Signed-off-by: Greg Kroah-Hartman --- drivers/infiniband/ulp/isert/ib_isert.c | 31 ++++++++----------------- drivers/infiniband/ulp/isert/ib_isert.h | 1 - 2 files changed, 10 insertions(+), 22 deletions(-) diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c index c5aeab06acc7..f8007df8f079 100644 --- a/drivers/infiniband/ulp/isert/ib_isert.c +++ b/drivers/infiniband/ulp/isert/ib_isert.c @@ -572,14 +572,10 @@ isert_disconnect_work(struct work_struct *work) isert_put_conn(isert_conn); return; } - if (!isert_conn->logout_posted) { - pr_debug("Calling rdma_disconnect for !logout_posted from" - " isert_disconnect_work\n"); - rdma_disconnect(isert_conn->conn_cm_id); - mutex_unlock(&isert_conn->conn_mutex); - iscsit_cause_connection_reinstatement(isert_conn->conn, 0); - goto wake_up; - } + + /* Send DREQ/DREP towards our initiator */ + rdma_disconnect(isert_conn->conn_cm_id); + mutex_unlock(&isert_conn->conn_mutex); wake_up: @@ -1371,11 +1367,8 @@ isert_do_control_comp(struct work_struct *work) break; case ISTATE_SEND_LOGOUTRSP: pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n"); - /* - * Call atomic_dec(&isert_conn->post_send_buf_count) - * from isert_wait_conn() - */ - isert_conn->logout_posted = true; + + atomic_dec(&isert_conn->post_send_buf_count); iscsit_logout_post_handler(cmd, cmd->conn); break; default: @@ -1483,6 +1476,8 @@ isert_cq_rx_comp_err(struct isert_conn *isert_conn) isert_conn->state = ISER_CONN_DOWN; mutex_unlock(&isert_conn->conn_mutex); + iscsit_cause_connection_reinstatement(isert_conn->conn, 0); + complete(&isert_conn->conn_wait_comp_err); } @@ -2247,15 +2242,9 @@ static void isert_wait_conn(struct iscsi_conn *conn) struct isert_conn *isert_conn = conn->context; pr_debug("isert_wait_conn: Starting \n"); - /* - * Decrement post_send_buf_count for special case when called - * from isert_do_control_comp() -> iscsit_logout_post_handler() - */ - mutex_lock(&isert_conn->conn_mutex); - if (isert_conn->logout_posted) - atomic_dec(&isert_conn->post_send_buf_count); - if (isert_conn->conn_cm_id && isert_conn->state != ISER_CONN_DOWN) { + mutex_lock(&isert_conn->conn_mutex); + if (isert_conn->conn_cm_id) { pr_debug("Calling rdma_disconnect from isert_wait_conn\n"); rdma_disconnect(isert_conn->conn_cm_id); } diff --git a/drivers/infiniband/ulp/isert/ib_isert.h b/drivers/infiniband/ulp/isert/ib_isert.h index dfe4a2ebef0d..df193dc19f61 100644 --- a/drivers/infiniband/ulp/isert/ib_isert.h +++ b/drivers/infiniband/ulp/isert/ib_isert.h @@ -78,7 +78,6 @@ struct isert_device; struct isert_conn { enum iser_conn_state state; - bool logout_posted; int post_recv_buf_count; atomic_t post_send_buf_count; u32 responder_resources; -- 2.20.1