linux-kernel - [PATCH] scsi: lpfc: avoid uninitialized variable warning

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Date:   Fri, 22 Mar 2019 15:25:49 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     James Smart <james.smart@...adcom.com>,
        Dick Kennedy <dick.kennedy@...adcom.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Hannes Reinecke <hare@...e.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] scsi: lpfc: avoid uninitialized variable warning

clang -Wuninitialized incorrectly sees a variable being used without
initialization:

drivers/scsi/lpfc/lpfc_nvme.c:2102:37: error: variable 'localport' is uninitialized when used here
      [-Werror,-Wuninitialized]
                lport = (struct lpfc_nvme_lport *)localport->private;
                                                  ^~~~~~~~~
drivers/scsi/lpfc/lpfc_nvme.c:2059:38: note: initialize the variable 'localport' to silence this warning
        struct nvme_fc_local_port *localport;
                                            ^
                                             = NULL
1 error generated.

This is clearly in dead code, as the condition leading up to it is
always false when CONFIG_NVME_FC is disabled, and the variable
is always initialized when nvme_fc_register_localport() got
called successfully.

Change the preprocessor conditional to the equivalent C construct,
which makes the code more readable and gets rid of the warning.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/scsi/lpfc/lpfc_nvme.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_nvme.c b/drivers/scsi/lpfc/lpfc_nvme.c
index 1aa00d2c3f74..9defff711884 100644
--- a/drivers/scsi/lpfc/lpfc_nvme.c
+++ b/drivers/scsi/lpfc/lpfc_nvme.c
@@ -2080,15 +2080,15 @@ lpfc_nvme_create_localport(struct lpfc_vport *vport)
 		lpfc_nvme_template.max_hw_queues =
 			phba->sli4_hba.num_present_cpu;
 
+	if (!IS_ENABLED(CONFIG_NVME_FC))
+		return ret;
+
 	/* localport is allocated from the stack, but the registration
 	 * call allocates heap memory as well as the private area.
 	 */
-#if (IS_ENABLED(CONFIG_NVME_FC))
+
 	ret = nvme_fc_register_localport(&nfcp_info, &lpfc_nvme_template,
 					 &vport->phba->pcidev->dev, &localport);
-#else
-	ret = -ENOMEM;
-#endif
 	if (!ret) {
 		lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME | LOG_NVME_DISC,
 				 "6005 Successfully registered local "
-- 
2.20.0