cxl/mem: Make cxl_dvsec_range() init failure fatal

In preparation for the cxl_pci driver to continue operation after
cxl_dvsec_range() failure, update cxl_mem to check for negative error
codes in info->ranges. Treat that condition as fatal regardless of the
state of the HDM configuration since cxl_mem needs positive confirmation
that legacy ranges were not established by platform firmware or another
agent.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com.
Reviewed-by: Ben Widawsky <ben.widawsky@intel.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Link: https://lore.kernel.org/r/164730735324.3806189.4167509857771192422.stgit@dwillia2-desk3.amr.corp.intel.comSigned-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/cxl/mem.c

@@ -88,6 +88,9 @@ __mock bool cxl_dvsec_decode_init(struct cxl_dev_state *cxlds)
 	void __iomem *crb;
 	u32 global_ctrl;
 
+	if (info->ranges < 0)
+		return false;
+
 	/* map hdm decoder */
 	crb = ioremap(cxlds->component_reg_phys, CXL_COMPONENT_REG_BLOCK_SIZE);
 	if (!crb) {