3.19.8-ckt9 -stable review patch. If anyone has any objections, please let me know.
------------------ From: Jenny Derzhavetz <jen...@mellanox.com> commit 3e03c4b01da3e6a5f3081eb0aa252490fe83e352 upstream. The iscsi target core teardown sequence calls wait_conn for all active commands to finish gracefully by: - move the queue-pair to error state - drain all the completions - wait for the core to finish handling all session commands However, when tearing down a session while there are sequenced commands that are still waiting for unsolicited data outs, we can block forever as these are missing an extra reference put. We basically need the equivalent of iscsit_free_queue_reqs_for_conn() which is called after wait_conn has returned. Address this by an explicit walk on conn_cmd_list and put the extra reference. Signed-off-by: Jenny Derzhavetz <jen...@mellanox.com> Signed-off-by: Sagi Grimberg <sa...@mellanox.com> Signed-off-by: Nicholas Bellinger <n...@linux-iscsi.org> Signed-off-by: Kamal Mostafa <ka...@canonical.com> --- drivers/infiniband/ulp/isert/ib_isert.c | 38 ++++++++++++++++++++++++++++++++- 1 file changed, 37 insertions(+), 1 deletion(-) diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c index aee23d9..46563f1 100644 --- a/drivers/infiniband/ulp/isert/ib_isert.c +++ b/drivers/infiniband/ulp/isert/ib_isert.c @@ -3294,6 +3294,41 @@ isert_wait4flush(struct isert_conn *isert_conn) wait_for_completion(&isert_conn->conn_wait_comp_err); } +/** + * isert_put_unsol_pending_cmds() - Drop commands waiting for + * unsolicitate dataout + * @conn: iscsi connection + * + * We might still have commands that are waiting for unsolicited + * dataouts messages. We must put the extra reference on those + * before blocking on the target_wait_for_session_cmds + */ +static void +isert_put_unsol_pending_cmds(struct iscsi_conn *conn) +{ + struct iscsi_cmd *cmd, *tmp; + static LIST_HEAD(drop_cmd_list); + + spin_lock_bh(&conn->cmd_lock); + list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) { + if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) && + (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) && + (cmd->write_data_done < cmd->se_cmd.data_length)) + list_move_tail(&cmd->i_conn_node, &drop_cmd_list); + } + spin_unlock_bh(&conn->cmd_lock); + + list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) { + list_del_init(&cmd->i_conn_node); + if (cmd->i_state != ISTATE_REMOVE) { + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + + isert_info("conn %p dropping cmd %p\n", conn, cmd); + isert_put_cmd(isert_cmd, true); + } + } +} + static void isert_wait_conn(struct iscsi_conn *conn) { struct isert_conn *isert_conn = conn->context; @@ -3312,8 +3347,9 @@ static void isert_wait_conn(struct iscsi_conn *conn) isert_conn_terminate(isert_conn); mutex_unlock(&isert_conn->conn_mutex); - isert_wait4cmds(conn); isert_wait4flush(isert_conn); + isert_put_unsol_pending_cmds(conn); + isert_wait4cmds(conn); isert_wait4logout(isert_conn); queue_work(isert_release_wq, &isert_conn->release_work); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/