linux-kernel - [PATCH v2 1/1] scsi: lpfc: Do not abuse UUID APIs

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Message-Id: <20230807100217.34646-1-andriy.shevchenko@linux.intel.com>
Date:   Mon,  7 Aug 2023 13:02:17 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     "Martin K. Petersen" <martin.petersen@...cle.com>,
        Justin Tee <justin.tee@...adcom.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     James Smart <james.smart@...adcom.com>,
        Dick Kennedy <dick.kennedy@...adcom.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v2 1/1] scsi: lpfc: Do not abuse UUID APIs

The lpfc_vmid_host_uuid is not defined as uuid_t and its usage is not
the same as for uuid_t operations (like exporting or importing).
Hence replace call to uuid_is_null() by respective memchr_inv() without
abusing casting.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
v2: fixed the logic: memchr_inv() returns "true" when uuid_is_null() returns false.
 drivers/scsi/lpfc/lpfc_els.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
index 2bad9954c355..1e74ae65768d 100644
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -1332,7 +1332,7 @@ lpfc_issue_els_flogi(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
 	if (phba->cfg_vmid_priority_tagging) {
 		sp->cmn.priority_tagging = 1;
 		/* lpfc_vmid_host_uuid is combination of wwpn and wwnn */
-		if (uuid_is_null((uuid_t *)vport->lpfc_vmid_host_uuid)) {
+		if (!memchr_inv(vport->lpfc_vmid_host_uuid, 0, LPFC_COMPRESS_VMID_SIZE)) {
 			memcpy(vport->lpfc_vmid_host_uuid, phba->wwpn,
 			       sizeof(phba->wwpn));
 			memcpy(&vport->lpfc_vmid_host_uuid[8], phba->wwnn,
@@ -12331,7 +12331,7 @@ lpfc_vmid_uvem(struct lpfc_vport *vport,
 	elsiocb->vmid_tag.vmid_context = vmid_context;
 	pcmd = (u8 *)elsiocb->cmd_dmabuf->virt;
 
-	if (uuid_is_null((uuid_t *)vport->lpfc_vmid_host_uuid))
+	if (!memchr_inv(vport->lpfc_vmid_host_uuid, 0, LPFC_COMPRESS_VMID_SIZE))
 		memcpy(vport->lpfc_vmid_host_uuid, vmid->host_vmid,
 		       LPFC_COMPRESS_VMID_SIZE);
 
-- 
2.40.0.1.gaa8946217a0b