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scsi: lpfc: correct rcu unlock issue in lpfc_nvme_info_show

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[ Upstream commit 79080d349f ]

Many of the exit cases were not releasing the rcu read lock.  Corrected the
exit paths.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Tested-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
James Smart
2019-05-06 17:26:48 -07:00
committed by Greg Kroah-Hartman
parent 32d3f7d9de
commit 334d1a2373
1 changed files with 19 additions and 13 deletions
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32
drivers/scsi/lpfc/lpfc_attr.c
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@@ -341,7 +341,7 @@ lpfc_nvme_info_show(struct device *dev, struct device_attribute *attr,
phba->sli4_hba.scsi_xri_max,
lpfc_sli4_get_els_iocb_cnt(phba));
if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)
goto buffer_done;
goto rcu_unlock_buf_done;
/* Port state is only one of two values for now. */
if (localport->port_id)
@@ -357,7 +357,7 @@ lpfc_nvme_info_show(struct device *dev, struct device_attribute *attr,
wwn_to_u64(vport->fc_nodename.u.wwn),
localport->port_id, statep);
if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)
goto buffer_done;
goto rcu_unlock_buf_done;
list_for_each_entry(ndlp, &vport->fc_nodes, nlp_listp) {
nrport = NULL;
@@ -384,39 +384,39 @@ lpfc_nvme_info_show(struct device *dev, struct device_attribute *attr,
/* Tab in to show lport ownership. */
if (strlcat(buf, "NVME RPORT ", PAGE_SIZE) >= PAGE_SIZE)
goto buffer_done;
goto rcu_unlock_buf_done;
if (phba->brd_no >= 10) {
if (strlcat(buf, " ", PAGE_SIZE) >= PAGE_SIZE)
goto buffer_done;
goto rcu_unlock_buf_done;
}
scnprintf(tmp, sizeof(tmp), "WWPN x%llx ",
nrport->port_name);
if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)
goto buffer_done;
goto rcu_unlock_buf_done;
scnprintf(tmp, sizeof(tmp), "WWNN x%llx ",
nrport->node_name);
if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)
goto buffer_done;
goto rcu_unlock_buf_done;
scnprintf(tmp, sizeof(tmp), "DID x%06x ",
nrport->port_id);
if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)
goto buffer_done;
goto rcu_unlock_buf_done;
/* An NVME rport can have multiple roles. */
if (nrport->port_role & FC_PORT_ROLE_NVME_INITIATOR) {
if (strlcat(buf, "INITIATOR ", PAGE_SIZE) >= PAGE_SIZE)
goto buffer_done;
goto rcu_unlock_buf_done;
}
if (nrport->port_role & FC_PORT_ROLE_NVME_TARGET) {
if (strlcat(buf, "TARGET ", PAGE_SIZE) >= PAGE_SIZE)
goto buffer_done;
goto rcu_unlock_buf_done;
}
if (nrport->port_role & FC_PORT_ROLE_NVME_DISCOVERY) {
if (strlcat(buf, "DISCSRVC ", PAGE_SIZE) >= PAGE_SIZE)
goto buffer_done;
goto rcu_unlock_buf_done;
}
if (nrport->port_role & ~(FC_PORT_ROLE_NVME_INITIATOR |
FC_PORT_ROLE_NVME_TARGET |
@@ -424,12 +424,12 @@ lpfc_nvme_info_show(struct device *dev, struct device_attribute *attr,
scnprintf(tmp, sizeof(tmp), "UNKNOWN ROLE x%x",
nrport->port_role);
if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)
goto buffer_done;
goto rcu_unlock_buf_done;
}
scnprintf(tmp, sizeof(tmp), "%s\n", statep);
if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)
goto buffer_done;
goto rcu_unlock_buf_done;
}
rcu_read_unlock();
@@ -491,7 +491,13 @@ lpfc_nvme_info_show(struct device *dev, struct device_attribute *attr,
atomic_read(&lport->cmpl_fcp_err));
strlcat(buf, tmp, PAGE_SIZE);
buffer_done:
/* RCU is already unlocked. */
goto buffer_done;
rcu_unlock_buf_done:
rcu_read_unlock();
buffer_done:
len = strnlen(buf, PAGE_SIZE);
if (unlikely(len >= (PAGE_SIZE - 1))) {