From: James Smart Date: Fri, 11 Jan 2008 06:53:27 +0000 (-0500) Subject: [SCSI] lpfc 8.2.4 : Rework misplaced reference taking on node structure X-Git-Tag: v2.6.25-rc1~1230^2~51 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fa4066b672821d24cb7180b8d0434b01a7043172;p=linux-2.6 [SCSI] lpfc 8.2.4 : Rework misplaced reference taking on node structure Rework misplaced reference taking on node structure Signed-off-by: James Smart Signed-off-by: James Bottomley --- diff --git a/drivers/scsi/lpfc/lpfc_ct.c b/drivers/scsi/lpfc/lpfc_ct.c index 3759ae1dc5..92441ce610 100644 --- a/drivers/scsi/lpfc/lpfc_ct.c +++ b/drivers/scsi/lpfc/lpfc_ct.c @@ -561,7 +561,6 @@ lpfc_cmpl_ct_cmd_gid_ft(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb, if (vport->load_flag & FC_UNLOADING) goto out; - if (lpfc_els_chk_latt(vport) || lpfc_error_lost_link(irsp)) { lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY, "0216 Link event during NS query\n"); diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c index 8da6e8be9d..c6b739dc6b 100644 --- a/drivers/scsi/lpfc/lpfc_els.c +++ b/drivers/scsi/lpfc/lpfc_els.c @@ -120,12 +120,8 @@ lpfc_prep_els_iocb(struct lpfc_vport *vport, uint8_t expectRsp, pcmd = kmalloc(sizeof(struct lpfc_dmabuf), GFP_KERNEL); if (pcmd) pcmd->virt = lpfc_mbuf_alloc(phba, MEM_PRI, &pcmd->phys); - if (!pcmd || !pcmd->virt) { - kfree(pcmd); - - lpfc_sli_release_iocbq(phba, elsiocb); - return NULL; - } + if (!pcmd || !pcmd->virt) + goto els_iocb_free_pcmb_exit; INIT_LIST_HEAD(&pcmd->list); @@ -135,13 +131,8 @@ lpfc_prep_els_iocb(struct lpfc_vport *vport, uint8_t expectRsp, if (prsp) prsp->virt = lpfc_mbuf_alloc(phba, MEM_PRI, &prsp->phys); - if (!prsp || !prsp->virt) { - kfree(prsp); - lpfc_mbuf_free(phba, pcmd->virt, pcmd->phys); - kfree(pcmd); - lpfc_sli_release_iocbq(phba, elsiocb); - return NULL; - } + if (!prsp || !prsp->virt) + goto els_iocb_free_prsp_exit; INIT_LIST_HEAD(&prsp->list); } else { prsp = NULL; @@ -152,15 +143,8 @@ lpfc_prep_els_iocb(struct lpfc_vport *vport, uint8_t expectRsp, if (pbuflist) pbuflist->virt = lpfc_mbuf_alloc(phba, MEM_PRI, &pbuflist->phys); - if (!pbuflist || !pbuflist->virt) { - lpfc_sli_release_iocbq(phba, elsiocb); - lpfc_mbuf_free(phba, pcmd->virt, pcmd->phys); - lpfc_mbuf_free(phba, prsp->virt, prsp->phys); - kfree(pcmd); - kfree(prsp); - kfree(pbuflist); - return NULL; - } + if (!pbuflist || !pbuflist->virt) + goto els_iocb_free_pbuf_exit; INIT_LIST_HEAD(&pbuflist->list); @@ -205,7 +189,10 @@ lpfc_prep_els_iocb(struct lpfc_vport *vport, uint8_t expectRsp, bpl->tus.w = le32_to_cpu(bpl->tus.w); } + /* prevent preparing iocb with NULL ndlp reference */ elsiocb->context1 = lpfc_nlp_get(ndlp); + if (!elsiocb->context1) + goto els_iocb_free_pbuf_exit; elsiocb->context2 = pcmd; elsiocb->context3 = pbuflist; elsiocb->retry = retry; @@ -231,8 +218,20 @@ lpfc_prep_els_iocb(struct lpfc_vport *vport, uint8_t expectRsp, cmdSize); } return elsiocb; -} +els_iocb_free_pbuf_exit: + lpfc_mbuf_free(phba, prsp->virt, prsp->phys); + kfree(pbuflist); + +els_iocb_free_prsp_exit: + lpfc_mbuf_free(phba, pcmd->virt, pcmd->phys); + kfree(prsp); + +els_iocb_free_pcmb_exit: + kfree(pcmd); + lpfc_sli_release_iocbq(phba, elsiocb); + return NULL; +} static int lpfc_issue_fabric_reglogin(struct lpfc_vport *vport) @@ -513,6 +512,9 @@ lpfc_cmpl_els_flogi(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb, /* Check to see if link went down during discovery */ if (lpfc_els_chk_latt(vport)) { + /* One additional decrement on node reference count to + * trigger the release of the node + */ lpfc_nlp_put(ndlp); goto out; } @@ -731,6 +733,9 @@ lpfc_initial_flogi(struct lpfc_vport *vport) } if (lpfc_issue_els_flogi(vport, ndlp, 0)) { + /* This decrement of reference count to node shall kick off + * the release of the node. + */ lpfc_nlp_put(ndlp); } return 1; @@ -754,7 +759,11 @@ lpfc_initial_fdisc(struct lpfc_vport *vport) lpfc_dequeue_node(vport, ndlp); } if (lpfc_issue_els_fdisc(vport, ndlp, 0)) { + /* decrement node reference count to trigger the release of + * the node. + */ lpfc_nlp_put(ndlp); + return 0; } return 1; } @@ -1557,6 +1566,9 @@ lpfc_issue_els_scr(struct lpfc_vport *vport, uint32_t nportid, uint8_t retry) ndlp->nlp_DID, ELS_CMD_SCR); if (!elsiocb) { + /* This will trigger the release of the node just + * allocated + */ lpfc_nlp_put(ndlp); return 1; } @@ -1578,10 +1590,17 @@ lpfc_issue_els_scr(struct lpfc_vport *vport, uint32_t nportid, uint8_t retry) phba->fc_stat.elsXmitSCR++; elsiocb->iocb_cmpl = lpfc_cmpl_els_cmd; if (lpfc_sli_issue_iocb(phba, pring, elsiocb, 0) == IOCB_ERROR) { + /* The additional lpfc_nlp_put will cause the following + * lpfc_els_free_iocb routine to trigger the rlease of + * the node. + */ lpfc_nlp_put(ndlp); lpfc_els_free_iocb(phba, elsiocb); return 1; } + /* This will cause the callback-function lpfc_cmpl_els_cmd to + * trigger the release of node. + */ lpfc_nlp_put(ndlp); return 0; } @@ -1613,6 +1632,9 @@ lpfc_issue_els_farpr(struct lpfc_vport *vport, uint32_t nportid, uint8_t retry) elsiocb = lpfc_prep_els_iocb(vport, 1, cmdsize, retry, ndlp, ndlp->nlp_DID, ELS_CMD_RNID); if (!elsiocb) { + /* This will trigger the release of the node just + * allocated + */ lpfc_nlp_put(ndlp); return 1; } @@ -1649,10 +1671,17 @@ lpfc_issue_els_farpr(struct lpfc_vport *vport, uint32_t nportid, uint8_t retry) phba->fc_stat.elsXmitFARPR++; elsiocb->iocb_cmpl = lpfc_cmpl_els_cmd; if (lpfc_sli_issue_iocb(phba, pring, elsiocb, 0) == IOCB_ERROR) { + /* The additional lpfc_nlp_put will cause the following + * lpfc_els_free_iocb routine to trigger the release of + * the node. + */ lpfc_nlp_put(ndlp); lpfc_els_free_iocb(phba, elsiocb); return 1; } + /* This will cause the callback-function lpfc_cmpl_els_cmd to + * trigger the release of the node. + */ lpfc_nlp_put(ndlp); return 0; } @@ -1712,7 +1741,10 @@ lpfc_els_retry_delay(unsigned long ptr) return; } - evtp->evt_arg1 = ndlp; + /* We need to hold the node by incrementing the reference + * count until the queued work is done + */ + evtp->evt_arg1 = lpfc_nlp_get(ndlp); evtp->evt = LPFC_EVT_ELS_RETRY; list_add_tail(&evtp->evt_listp, &phba->work_list); if (phba->work_wait) @@ -2190,6 +2222,11 @@ lpfc_cmpl_els_logo_acc(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb, * thread, just unregister the RPI. */ lpfc_unreg_rpi(vport, ndlp); + } else { + /* Indicate the node has already released, should + * not reference to it from within lpfc_els_free_iocb. + */ + cmdiocb->context1 = NULL; } } lpfc_els_free_iocb(phba, cmdiocb); @@ -2208,7 +2245,6 @@ lpfc_mbx_cmpl_dflt_rpi(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb) mempool_free(pmb, phba->mbox_mem_pool); if (ndlp) { lpfc_nlp_put(ndlp); - /* This is the end of the default RPI cleanup logic for this * ndlp. If no other discovery threads are using this ndlp. * we should free all resources associated with it. @@ -2236,11 +2272,13 @@ lpfc_cmpl_els_rsp(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb, if (cmdiocb->context_un.mbox) mbox = cmdiocb->context_un.mbox; - /* First determine if this is a LS_RJT cmpl */ + /* First determine if this is a LS_RJT cmpl. Note, this callback + * function can have cmdiocb->contest1 (ndlp) field set to NULL. + */ pcmd = (uint8_t *) (((struct lpfc_dmabuf *) cmdiocb->context2)->virt); - if (*((uint32_t *) (pcmd)) == ELS_CMD_LS_RJT) { - /* A LS_RJT associated with Default RPI cleanup - * has its own seperate code path. + if (ndlp && (*((uint32_t *) (pcmd)) == ELS_CMD_LS_RJT)) { + /* A LS_RJT associated with Default RPI cleanup has its own + * seperate code path. */ if (!(ndlp->nlp_flag & NLP_RM_DFLT_RPI)) ls_rjt = 1; @@ -2257,8 +2295,14 @@ lpfc_cmpl_els_rsp(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb, mempool_free(mbox, phba->mbox_mem_pool); } if (ndlp && (ndlp->nlp_flag & NLP_RM_DFLT_RPI)) - if (lpfc_nlp_not_used(ndlp)) + if (lpfc_nlp_not_used(ndlp)) { ndlp = NULL; + /* Indicate the node has already released, + * should not reference to it from within + * the routine lpfc_els_free_iocb. + */ + cmdiocb->context1 = NULL; + } goto out; } @@ -2302,14 +2346,27 @@ lpfc_cmpl_els_rsp(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb, ndlp->nlp_DID, ndlp->nlp_flag, ndlp->nlp_state, ndlp->nlp_rpi); - if (lpfc_nlp_not_used(ndlp)) + if (lpfc_nlp_not_used(ndlp)) { ndlp = NULL; + /* Indicate node has already been released, + * should not reference to it from within + * the routine lpfc_els_free_iocb. + */ + cmdiocb->context1 = NULL; + } } else { /* Do not drop node for lpfc_els_abort'ed ELS cmds */ if (!lpfc_error_lost_link(irsp) && ndlp->nlp_flag & NLP_ACC_REGLOGIN) { - if (lpfc_nlp_not_used(ndlp)) + if (lpfc_nlp_not_used(ndlp)) { ndlp = NULL; + /* Indicate node has already been + * released, should not reference + * to it from within the routine + * lpfc_els_free_iocb. + */ + cmdiocb->context1 = NULL; + } } } mp = (struct lpfc_dmabuf *) mbox->context1; @@ -2331,7 +2388,12 @@ out: * resources. */ if (ls_rjt) - lpfc_nlp_not_used(ndlp); + if (lpfc_nlp_not_used(ndlp)) + /* Indicate node has already been released, + * should not reference to it from within + * the routine lpfc_els_free_iocb. + */ + cmdiocb->context1 = NULL; } lpfc_els_free_iocb(phba, cmdiocb); @@ -3292,7 +3354,10 @@ lpfc_els_rsp_rps_acc(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb) elsiocb = lpfc_prep_els_iocb(phba->pport, 0, cmdsize, lpfc_max_els_tries, ndlp, ndlp->nlp_DID, ELS_CMD_ACC); + + /* Decrement the ndlp reference count from previous mbox command */ lpfc_nlp_put(ndlp); + if (!elsiocb) return; @@ -3375,11 +3440,13 @@ lpfc_els_rcv_rps(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb, mbox->context2 = lpfc_nlp_get(ndlp); mbox->vport = vport; mbox->mbox_cmpl = lpfc_els_rsp_rps_acc; - if (lpfc_sli_issue_mbox (phba, mbox, MBX_NOWAIT) + if (lpfc_sli_issue_mbox(phba, mbox, MBX_NOWAIT) != MBX_NOT_FINISHED) /* Mbox completion will send ELS Response */ return 0; - + /* Decrement reference count used for the failed mbox + * command. + */ lpfc_nlp_put(ndlp); mempool_free(mbox, phba->mbox_mem_pool); } @@ -4284,7 +4351,6 @@ lpfc_cmpl_reg_new_vport(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb) spin_lock_irq(shost->host_lock); vport->fc_flag &= ~FC_VPORT_NEEDS_REG_VPI; spin_unlock_irq(shost->host_lock); - lpfc_nlp_put(ndlp); if (mb->mbxStatus) { lpfc_printf_vlog(vport, KERN_ERR, LOG_MBOX, @@ -4317,6 +4383,12 @@ lpfc_cmpl_reg_new_vport(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb) else lpfc_do_scr_ns_plogi(phba, vport); } + + /* Now, we decrement the ndlp reference count held for this + * callback function + */ + lpfc_nlp_put(ndlp); + mempool_free(pmb, phba->mbox_mem_pool); return; } @@ -4336,26 +4408,29 @@ lpfc_register_new_vport(struct lpfc_hba *phba, struct lpfc_vport *vport, mbox->mbox_cmpl = lpfc_cmpl_reg_new_vport; if (lpfc_sli_issue_mbox(phba, mbox, MBX_NOWAIT) == MBX_NOT_FINISHED) { + /* mailbox command not success, decrement ndlp + * reference count for this command + */ + lpfc_nlp_put(ndlp); mempool_free(mbox, phba->mbox_mem_pool); - spin_lock_irq(shost->host_lock); - vport->fc_flag &= ~FC_VPORT_NEEDS_REG_VPI; - spin_unlock_irq(shost->host_lock); - lpfc_vport_set_state(vport, FC_VPORT_FAILED); lpfc_printf_vlog(vport, KERN_ERR, LOG_MBOX, "0253 Register VPI: Can't send mbox\n"); + goto mbox_err_exit; } } else { - lpfc_vport_set_state(vport, FC_VPORT_FAILED); - lpfc_printf_vlog(vport, KERN_ERR, LOG_MBOX, "0254 Register VPI: no memory\n"); - - spin_lock_irq(shost->host_lock); - vport->fc_flag &= ~FC_VPORT_NEEDS_REG_VPI; - spin_unlock_irq(shost->host_lock); - lpfc_nlp_put(ndlp); + goto mbox_err_exit; } + return; + +mbox_err_exit: + lpfc_vport_set_state(vport, FC_VPORT_FAILED); + spin_lock_irq(shost->host_lock); + vport->fc_flag &= ~FC_VPORT_NEEDS_REG_VPI; + spin_unlock_irq(shost->host_lock); + return; } static void @@ -4436,7 +4511,8 @@ lpfc_cmpl_els_fdisc(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb, else lpfc_do_scr_ns_plogi(phba, vport); - lpfc_nlp_put(ndlp); /* Free Fabric ndlp for vports */ + /* Unconditionaly kick off releasing fabric node for vports */ + lpfc_nlp_put(ndlp); } out: diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c index 644d96012d..dc042bd97b 100644 --- a/drivers/scsi/lpfc/lpfc_hbadisc.c +++ b/drivers/scsi/lpfc/lpfc_hbadisc.c @@ -149,7 +149,10 @@ lpfc_dev_loss_tmo_callbk(struct fc_rport *rport) return; spin_lock_irq(&phba->hbalock); - evtp->evt_arg1 = ndlp; + /* We need to hold the node by incrementing the reference + * count until this queued work is done + */ + evtp->evt_arg1 = lpfc_nlp_get(ndlp); evtp->evt = LPFC_EVT_DEV_LOSS; list_add_tail(&evtp->evt_listp, &phba->work_list); if (phba->work_wait) @@ -300,12 +303,18 @@ lpfc_work_list_done(struct lpfc_hba *phba) ndlp = (struct lpfc_nodelist *) (evtp->evt_arg1); lpfc_els_retry_delay_handler(ndlp); free_evt = 0; /* evt is part of ndlp */ + /* decrement the node reference count held + * for this queued work + */ + lpfc_nlp_put(ndlp); break; case LPFC_EVT_DEV_LOSS: ndlp = (struct lpfc_nodelist *)(evtp->evt_arg1); - lpfc_nlp_get(ndlp); lpfc_dev_loss_tmo_handler(ndlp); free_evt = 0; + /* decrement the node reference count held for + * this queued work + */ lpfc_nlp_put(ndlp); break; case LPFC_EVT_ONLINE: @@ -1176,6 +1185,9 @@ lpfc_mbx_cmpl_reg_login(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb) lpfc_mbuf_free(phba, mp->virt, mp->phys); kfree(mp); mempool_free(pmb, phba->mbox_mem_pool); + /* decrement the node reference count held for this callback + * function. + */ lpfc_nlp_put(ndlp); return; @@ -1363,6 +1375,9 @@ lpfc_mbx_cmpl_ns_reg_login(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb) if (mb->mbxStatus) { out: + /* decrement the node reference count held for this + * callback function. + */ lpfc_nlp_put(ndlp); lpfc_mbuf_free(phba, mp->virt, mp->phys); kfree(mp); @@ -1414,6 +1429,9 @@ out: goto out; } + /* decrement the node reference count held for this + * callback function. + */ lpfc_nlp_put(ndlp); lpfc_mbuf_free(phba, mp->virt, mp->phys); kfree(mp); @@ -1661,13 +1679,14 @@ void lpfc_drop_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp) { /* - * Use of lpfc_drop_node and UNUSED list. lpfc_drop_node should + * Use of lpfc_drop_node and UNUSED list: lpfc_drop_node should * be used if we wish to issue the "last" lpfc_nlp_put() to remove - * the ndlp from the vport. The ndlp resides on the UNUSED list - * until ALL other outstanding threads have completed. Thus, if a - * ndlp is on the UNUSED list already, we should never do another - * lpfc_drop_node() on it. + * the ndlp from the vport. The ndlp marked as UNUSED on the list + * until ALL other outstanding threads have completed. We check + * that the ndlp not already in the UNUSED state before we proceed. */ + if (ndlp->nlp_state == NLP_STE_UNUSED_NODE) + return; lpfc_nlp_set_state(vport, ndlp, NLP_STE_UNUSED_NODE); lpfc_nlp_put(ndlp); return; @@ -2767,7 +2786,9 @@ lpfc_mbx_cmpl_fdmi_reg_login(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb) else mod_timer(&vport->fc_fdmitmo, jiffies + HZ * 60); - /* Mailbox took a reference to the node */ + /* decrement the node reference count held for this callback + * function. + */ lpfc_nlp_put(ndlp); lpfc_mbuf_free(phba, mp->virt, mp->phys); kfree(mp); diff --git a/drivers/scsi/lpfc/lpfc_nportdisc.c b/drivers/scsi/lpfc/lpfc_nportdisc.c index 783659aa21..4a0e3406e3 100644 --- a/drivers/scsi/lpfc/lpfc_nportdisc.c +++ b/drivers/scsi/lpfc/lpfc_nportdisc.c @@ -922,6 +922,9 @@ lpfc_cmpl_plogi_plogi_issue(struct lpfc_vport *vport, NLP_STE_REG_LOGIN_ISSUE); return ndlp->nlp_state; } + /* decrement node reference count to the failed mbox + * command + */ lpfc_nlp_put(ndlp); mp = (struct lpfc_dmabuf *) mbox->context1; lpfc_mbuf_free(phba, mp->virt, mp->phys); diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c index 584c545164..fdd01e384e 100644 --- a/drivers/scsi/lpfc/lpfc_sli.c +++ b/drivers/scsi/lpfc/lpfc_sli.c @@ -2605,7 +2605,7 @@ lpfc_sli_issue_mbox(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmbox, uint32_t flag) "1806 Mbox x%x failed. No vport\n", pmbox->mb.mbxCommand); dump_stack(); - return MBXERR_ERROR; + return MBX_NOT_FINISHED; } }