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[174.67.196.173]) by smtp.gmail.com with ESMTPSA id z3sm23578631pgl.77.2021.07.07.11.43.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jul 2021 11:43:56 -0700 (PDT) From: James Smart To: linux-scsi@vger.kernel.org Cc: James Smart , Justin Tee Subject: [PATCH 02/20] lpfc: Remove use of kmalloc in trace event logging Date: Wed, 7 Jul 2021 11:43:33 -0700 Message-Id: <20210707184351.67872-3-jsmart2021@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210707184351.67872-1-jsmart2021@gmail.com> References: <20210707184351.67872-1-jsmart2021@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org There are instances when trace event logs are triggered from an interrupt context. The trace event log may attempt to alloc memory causing scheduling while atomic bug call traces. Remove the need for the kmalloc'ed vport array when checking the log_verbose flag, which eliminates the need for any allocation. Co-developed-by: Justin Tee Signed-off-by: Justin Tee Signed-off-by: James Smart --- drivers/scsi/lpfc/lpfc_init.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c index cf5bfd27058a..51f4058a75b8 100644 --- a/drivers/scsi/lpfc/lpfc_init.c +++ b/drivers/scsi/lpfc/lpfc_init.c @@ -14162,8 +14162,9 @@ void lpfc_dmp_dbg(struct lpfc_hba *phba) unsigned int temp_idx; int i; int j = 0; - unsigned long rem_nsec; - struct lpfc_vport **vports; + unsigned long rem_nsec, iflags; + bool log_verbose = false; + struct lpfc_vport *port_iterator; /* Don't dump messages if we explicitly set log_verbose for the * physical port or any vport. @@ -14171,16 +14172,24 @@ void lpfc_dmp_dbg(struct lpfc_hba *phba) if (phba->cfg_log_verbose) return; - vports = lpfc_create_vport_work_array(phba); - if (vports != NULL) { - for (i = 0; i <= phba->max_vpi && vports[i] != NULL; i++) { - if (vports[i]->cfg_log_verbose) { - lpfc_destroy_vport_work_array(phba, vports); + spin_lock_irqsave(&phba->port_list_lock, iflags); + list_for_each_entry(port_iterator, &phba->port_list, listentry) { + if (port_iterator->load_flag & FC_UNLOADING) + continue; + if (scsi_host_get(lpfc_shost_from_vport(port_iterator))) { + if (port_iterator->cfg_log_verbose) + log_verbose = true; + + scsi_host_put(lpfc_shost_from_vport(port_iterator)); + + if (log_verbose) { + spin_unlock_irqrestore(&phba->port_list_lock, + iflags); return; } } } - lpfc_destroy_vport_work_array(phba, vports); + spin_unlock_irqrestore(&phba->port_list_lock, iflags); if (atomic_cmpxchg(&phba->dbg_log_dmping, 0, 1) != 0) return;