From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Karsten Graul , Ursula Braun , "David S. Miller" Subject: [PATCH 4.18 135/150] net/smc: fix smc_buf_unuse to use the lgr pointer Date: Fri, 2 Nov 2018 19:34:57 +0100 Message-Id: <20181102182912.056921139@linuxfoundation.org> In-Reply-To: <20181102182902.250560510@linuxfoundation.org> References: <20181102182902.250560510@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Karsten Graul [ Upstream commit fb692ec4117f6fd25044cfb5720d6b79d400dc65 ] The pointer to the link group is unset in the smc connection structure right before the call to smc_buf_unuse. Provide the lgr pointer to smc_buf_unuse explicitly. And move the call to smc_lgr_schedule_free_work to the end of smc_conn_free. Fixes: a6920d1d130c ("net/smc: handle unregistered buffers") Signed-off-by: Karsten Graul Signed-off-by: Ursula Braun Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/smc/smc_core.c | 23 +++++++++++------------ 1 file changed, 11 insertions(+), 12 deletions(-) --- a/net/smc/smc_core.c +++ b/net/smc/smc_core.c @@ -114,22 +114,17 @@ static void __smc_lgr_unregister_conn(st sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */ } -/* Unregister connection and trigger lgr freeing if applicable +/* Unregister connection from lgr */ static void smc_lgr_unregister_conn(struct smc_connection *conn) { struct smc_link_group *lgr = conn->lgr; - int reduced = 0; write_lock_bh(&lgr->conns_lock); if (conn->alert_token_local) { - reduced = 1; __smc_lgr_unregister_conn(conn); } write_unlock_bh(&lgr->conns_lock); - if (!reduced || lgr->conns_num) - return; - smc_lgr_schedule_free_work(lgr); } static void smc_lgr_free_work(struct work_struct *work) @@ -238,7 +233,8 @@ out: return rc; } -static void smc_buf_unuse(struct smc_connection *conn) +static void smc_buf_unuse(struct smc_connection *conn, + struct smc_link_group *lgr) { if (conn->sndbuf_desc) conn->sndbuf_desc->used = 0; @@ -248,8 +244,6 @@ static void smc_buf_unuse(struct smc_con conn->rmb_desc->used = 0; } else { /* buf registration failed, reuse not possible */ - struct smc_link_group *lgr = conn->lgr; - write_lock_bh(&lgr->rmbs_lock); list_del(&conn->rmb_desc->list); write_unlock_bh(&lgr->rmbs_lock); @@ -262,11 +256,16 @@ static void smc_buf_unuse(struct smc_con /* remove a finished connection from its link group */ void smc_conn_free(struct smc_connection *conn) { - if (!conn->lgr) + struct smc_link_group *lgr = conn->lgr; + + if (!lgr) return; smc_cdc_tx_dismiss_slots(conn); - smc_lgr_unregister_conn(conn); - smc_buf_unuse(conn); + smc_lgr_unregister_conn(conn); /* unsets conn->lgr */ + smc_buf_unuse(conn, lgr); /* allow buffer reuse */ + + if (!lgr->conns_num) + smc_lgr_schedule_free_work(lgr); } static void smc_link_clear(struct smc_link *lnk)