We cannot use an embedded mutex in a structure with reference counting, as mutex unlock might be delayed, and the waiters might then access an already freed memory area. So convert it to a spinlock.
For details cf https://lkml.org/lkml/2015/2/11/245 Signed-off-by: Hannes Reinecke <[email protected]> --- drivers/scsi/libfc/fc_rport.c | 90 +++++++++++++++++++++---------------------- include/scsi/libfc.h | 4 +- 2 files changed, 47 insertions(+), 47 deletions(-) diff --git a/drivers/scsi/libfc/fc_rport.c b/drivers/scsi/libfc/fc_rport.c index 589ff9a..4520b5a 100644 --- a/drivers/scsi/libfc/fc_rport.c +++ b/drivers/scsi/libfc/fc_rport.c @@ -136,7 +136,7 @@ static struct fc_rport_priv *fc_rport_create(struct fc_lport *lport, rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN; kref_init(&rdata->kref); - mutex_init(&rdata->rp_mutex); + spin_lock_init(&rdata->rp_lock); rdata->local_port = lport; rdata->rp_state = RPORT_ST_INIT; rdata->event = RPORT_EV_NONE; @@ -251,7 +251,7 @@ static void fc_rport_work(struct work_struct *work) struct fc4_prov *prov; u8 type; - mutex_lock(&rdata->rp_mutex); + spin_lock(&rdata->rp_lock); event = rdata->event; rport_ops = rdata->ops; rport = rdata->rport; @@ -264,7 +264,7 @@ static void fc_rport_work(struct work_struct *work) rdata->event = RPORT_EV_NONE; rdata->major_retries = 0; kref_get(&rdata->kref); - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); if (!rport) rport = fc_remote_port_add(lport->host, 0, &ids); @@ -274,7 +274,7 @@ static void fc_rport_work(struct work_struct *work) kref_put(&rdata->kref, lport->tt.rport_destroy); return; } - mutex_lock(&rdata->rp_mutex); + spin_lock(&rdata->rp_lock); if (rdata->rport) FC_RPORT_DBG(rdata, "rport already allocated\n"); rdata->rport = rport; @@ -287,7 +287,7 @@ static void fc_rport_work(struct work_struct *work) rpriv->flags = rdata->flags; rpriv->e_d_tov = rdata->e_d_tov; rpriv->r_a_tov = rdata->r_a_tov; - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); if (rport_ops && rport_ops->event_callback) { FC_RPORT_DBG(rdata, "callback ev %d\n", event); @@ -313,7 +313,7 @@ static void fc_rport_work(struct work_struct *work) mutex_unlock(&fc_prov_mutex); } port_id = rdata->ids.port_id; - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); if (rport_ops && rport_ops->event_callback) { FC_RPORT_DBG(rdata, "callback ev %d\n", event); @@ -334,18 +334,18 @@ static void fc_rport_work(struct work_struct *work) if (rport) { rpriv = rport->dd_data; rpriv->rp_state = RPORT_ST_DELETE; - mutex_lock(&rdata->rp_mutex); + spin_lock(&rdata->rp_lock); rdata->rport = NULL; - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); fc_remote_port_delete(rport); } mutex_lock(&lport->disc.disc_mutex); - mutex_lock(&rdata->rp_mutex); + spin_lock(&rdata->rp_lock); if (rdata->rp_state == RPORT_ST_DELETE) { if (port_id == FC_FID_DIR_SERV) { rdata->event = RPORT_EV_NONE; - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); kref_put(&rdata->kref, lport->tt.rport_destroy); } else if ((rdata->flags & FC_RP_STARTED) && rdata->major_retries < @@ -354,11 +354,11 @@ static void fc_rport_work(struct work_struct *work) rdata->event = RPORT_EV_NONE; FC_RPORT_DBG(rdata, "work restart\n"); fc_rport_enter_flogi(rdata); - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); } else { FC_RPORT_DBG(rdata, "work delete\n"); list_del_rcu(&rdata->peers); - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); kref_put(&rdata->kref, lport->tt.rport_destroy); } } else { @@ -368,13 +368,13 @@ static void fc_rport_work(struct work_struct *work) rdata->event = RPORT_EV_NONE; if (rdata->rp_state == RPORT_ST_READY) fc_rport_enter_ready(rdata); - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); } mutex_unlock(&lport->disc.disc_mutex); break; default: - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); break; } } @@ -393,7 +393,7 @@ static void fc_rport_work(struct work_struct *work) */ static int fc_rport_login(struct fc_rport_priv *rdata) { - mutex_lock(&rdata->rp_mutex); + spin_lock(&rdata->rp_lock); rdata->flags |= FC_RP_STARTED; switch (rdata->rp_state) { @@ -409,7 +409,7 @@ static int fc_rport_login(struct fc_rport_priv *rdata) fc_rport_enter_flogi(rdata); break; } - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); return 0; } @@ -453,7 +453,7 @@ static void fc_rport_enter_delete(struct fc_rport_priv *rdata, */ static int fc_rport_logoff(struct fc_rport_priv *rdata) { - mutex_lock(&rdata->rp_mutex); + spin_lock(&rdata->rp_lock); FC_RPORT_DBG(rdata, "Remove port\n"); @@ -470,7 +470,7 @@ static int fc_rport_logoff(struct fc_rport_priv *rdata) */ fc_rport_enter_delete(rdata, RPORT_EV_STOP); out: - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); return 0; } @@ -505,7 +505,7 @@ static void fc_rport_timeout(struct work_struct *work) struct fc_rport_priv *rdata = container_of(work, struct fc_rport_priv, retry_work.work); - mutex_lock(&rdata->rp_mutex); + spin_lock(&rdata->rp_lock); switch (rdata->rp_state) { case RPORT_ST_FLOGI: @@ -530,7 +530,7 @@ static void fc_rport_timeout(struct work_struct *work) break; } - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); } /** @@ -666,7 +666,7 @@ static void fc_rport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp, if (fp == ERR_PTR(-FC_EX_CLOSED)) goto put; - mutex_lock(&rdata->rp_mutex); + spin_lock(&rdata->rp_lock); if (rdata->rp_state != RPORT_ST_FLOGI) { FC_RPORT_DBG(rdata, "Received a FLOGI response, but in state " @@ -700,7 +700,7 @@ static void fc_rport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp, out: fc_frame_free(fp); err: - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); put: kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); return; @@ -783,7 +783,7 @@ static void fc_rport_recv_flogi_req(struct fc_lport *lport, rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR; goto reject; } - mutex_lock(&rdata->rp_mutex); + spin_lock(&rdata->rp_lock); FC_RPORT_DBG(rdata, "Received FLOGI in %s state\n", fc_rport_state(rdata)); @@ -805,7 +805,7 @@ static void fc_rport_recv_flogi_req(struct fc_lport *lport, if (lport->point_to_multipoint) break; case RPORT_ST_DELETE: - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); rjt_data.reason = ELS_RJT_FIP; rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR; goto reject; @@ -822,13 +822,13 @@ static void fc_rport_recv_flogi_req(struct fc_lport *lport, * This queues work to be sure exchanges are reset. */ fc_rport_enter_delete(rdata, RPORT_EV_LOGO); - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); rjt_data.reason = ELS_RJT_BUSY; rjt_data.explan = ELS_EXPL_NONE; goto reject; } if (fc_rport_login_complete(rdata, fp)) { - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); rjt_data.reason = ELS_RJT_LOGIC; rjt_data.explan = ELS_EXPL_NONE; goto reject; @@ -850,7 +850,7 @@ static void fc_rport_recv_flogi_req(struct fc_lport *lport, else fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT); out: - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); mutex_unlock(&disc->disc_mutex); fc_frame_free(rx_fp); return; @@ -881,7 +881,7 @@ static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp, u16 cssp_seq; u8 op; - mutex_lock(&rdata->rp_mutex); + spin_lock(&rdata->rp_lock); FC_RPORT_DBG(rdata, "Received a PLOGI %s\n", fc_els_resp_type(fp)); @@ -922,7 +922,7 @@ static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp, out: fc_frame_free(fp); err: - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); } @@ -1005,7 +1005,7 @@ static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp, u8 op; u8 resp_code = 0; - mutex_lock(&rdata->rp_mutex); + spin_lock(&rdata->rp_lock); FC_RPORT_DBG(rdata, "Received a PRLI %s\n", fc_els_resp_type(fp)); @@ -1075,7 +1075,7 @@ static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp, out: fc_frame_free(fp); err: - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); } @@ -1153,7 +1153,7 @@ static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp, struct fc_rport_priv *rdata = rdata_arg; u8 op; - mutex_lock(&rdata->rp_mutex); + spin_lock(&rdata->rp_lock); FC_RPORT_DBG(rdata, "Received a RTV %s\n", fc_els_resp_type(fp)); @@ -1197,7 +1197,7 @@ static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp, out: fc_frame_free(fp); err: - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); } @@ -1289,7 +1289,7 @@ static void fc_rport_adisc_resp(struct fc_seq *sp, struct fc_frame *fp, struct fc_els_adisc *adisc; u8 op; - mutex_lock(&rdata->rp_mutex); + spin_lock(&rdata->rp_lock); FC_RPORT_DBG(rdata, "Received a ADISC response\n"); @@ -1326,7 +1326,7 @@ static void fc_rport_adisc_resp(struct fc_seq *sp, struct fc_frame *fp, out: fc_frame_free(fp); err: - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); } @@ -1483,7 +1483,7 @@ static void fc_rport_recv_els_req(struct fc_lport *lport, struct fc_frame *fp) mutex_unlock(&lport->disc.disc_mutex); goto reject; } - mutex_lock(&rdata->rp_mutex); + spin_lock(&rdata->rp_lock); mutex_unlock(&lport->disc.disc_mutex); switch (rdata->rp_state) { @@ -1493,7 +1493,7 @@ static void fc_rport_recv_els_req(struct fc_lport *lport, struct fc_frame *fp) case RPORT_ST_ADISC: break; default: - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); goto reject; } @@ -1523,7 +1523,7 @@ static void fc_rport_recv_els_req(struct fc_lport *lport, struct fc_frame *fp) break; } - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); return; reject: @@ -1616,7 +1616,7 @@ static void fc_rport_recv_plogi_req(struct fc_lport *lport, goto reject; } - mutex_lock(&rdata->rp_mutex); + spin_lock(&rdata->rp_lock); mutex_unlock(&disc->disc_mutex); rdata->ids.port_name = get_unaligned_be64(&pl->fl_wwpn); @@ -1643,7 +1643,7 @@ static void fc_rport_recv_plogi_req(struct fc_lport *lport, case RPORT_ST_PLOGI: FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI state\n"); if (rdata->ids.port_name < lport->wwpn) { - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); rjt_data.reason = ELS_RJT_INPROG; rjt_data.explan = ELS_EXPL_NONE; goto reject; @@ -1661,14 +1661,14 @@ static void fc_rport_recv_plogi_req(struct fc_lport *lport, case RPORT_ST_DELETE: FC_RPORT_DBG(rdata, "Received PLOGI in state %s - send busy\n", fc_rport_state(rdata)); - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); rjt_data.reason = ELS_RJT_BUSY; rjt_data.explan = ELS_EXPL_NONE; goto reject; } if (!fc_rport_compatible_roles(lport, rdata)) { FC_RPORT_DBG(rdata, "Received PLOGI for incompatible role\n"); - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); rjt_data.reason = ELS_RJT_LOGIC; rjt_data.explan = ELS_EXPL_NONE; goto reject; @@ -1691,7 +1691,7 @@ static void fc_rport_recv_plogi_req(struct fc_lport *lport, lport->tt.frame_send(lport, fp); fc_rport_enter_prli(rdata); out: - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); fc_frame_free(rx_fp); return; @@ -1910,12 +1910,12 @@ static void fc_rport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp) mutex_lock(&lport->disc.disc_mutex); rdata = lport->tt.rport_lookup(lport, sid); if (rdata) { - mutex_lock(&rdata->rp_mutex); + spin_lock(&rdata->rp_lock); FC_RPORT_DBG(rdata, "Received LOGO request while in state %s\n", fc_rport_state(rdata)); fc_rport_enter_delete(rdata, RPORT_EV_LOGO); - mutex_unlock(&rdata->rp_mutex); + spin_unlock(&rdata->rp_lock); } else FC_RPORT_ID_DBG(lport, sid, "Received LOGO from non-logged-in port\n"); diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h index 93d14da..7d63d23 100644 --- a/include/scsi/libfc.h +++ b/include/scsi/libfc.h @@ -187,7 +187,7 @@ struct fc_rport_libfc_priv { * @major_retries: The retry count for the entire PLOGI/PRLI state machine * @e_d_tov: Error detect timeout value (in msec) * @r_a_tov: Resource allocation timeout value (in msec) - * @rp_mutex: The mutex that protects the remote port + * @rp_lock: The lock that protects the remote port * @retry_work: Handle for retries * @event_callback: Callback when READY, FAILED or LOGO states complete * @prli_count: Count of open PRLI sessions in providers @@ -207,7 +207,7 @@ struct fc_rport_priv { unsigned int major_retries; unsigned int e_d_tov; unsigned int r_a_tov; - struct mutex rp_mutex; + spinlock_t rp_lock; struct delayed_work retry_work; enum fc_rport_event event; struct fc_rport_operations *ops; -- 1.8.5.6 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
