cxl/security: Fix Get Security State output payload endian handling

Multi-byte integer values in CXL mailbox payloads are little endian. Add
a definition of the Get Security State output payload and convert the
value before testing flags.

Fixes: 3282811 ("cxl/pmem: Introduce nvdimm_security_ops with ->get_flags() operation")
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/167030054822.4044561.4917796262037689553.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/cxl/security.c

@@ -16,14 +16,18 @@ static unsigned long cxl_pmem_get_security_flags(struct nvdimm *nvdimm,
 	struct cxl_memdev *cxlmd = cxl_nvd->cxlmd;
 	struct cxl_dev_state *cxlds = cxlmd->cxlds;
 	unsigned long security_flags = 0;
+	struct cxl_get_security_output {
+		__le32 flags;
+	} out;
 	u32 sec_out;
 	int rc;
 
 	rc = cxl_mbox_send_cmd(cxlds, CXL_MBOX_OP_GET_SECURITY_STATE, NULL, 0,
-			       &sec_out, sizeof(sec_out));
+			       &out, sizeof(out));
 	if (rc < 0)
 		return 0;
 
+	sec_out = le32_to_cpu(out.flags);
 	if (ptype == NVDIMM_MASTER) {
 		if (sec_out & CXL_PMEM_SEC_STATE_MASTER_PASS_SET)
 			set_bit(NVDIMM_SECURITY_UNLOCKED, &security_flags);