#include "skl.h"
#include "skl-i2s.h"
+#define NHLT_ACPI_HEADER_SIG "NHLT"
+
/* Unique identification for getting NHLT blobs */
static guid_t osc_guid =
GUID_INIT(0xA69F886E, 0x6CEB, 0x4594,
obj = acpi_evaluate_dsm(handle, &osc_guid, 1, 1, NULL);
if (obj && obj->type == ACPI_TYPE_BUFFER) {
nhlt_ptr = (struct nhlt_resource_desc *)obj->buffer.pointer;
- nhlt_table = (struct nhlt_acpi_table *)
+ if (nhlt_ptr->length)
+ nhlt_table = (struct nhlt_acpi_table *)
memremap(nhlt_ptr->min_addr, nhlt_ptr->length,
MEMREMAP_WB);
ACPI_FREE(obj);
+ if (nhlt_table && (strncmp(nhlt_table->header.signature,
+ NHLT_ACPI_HEADER_SIG,
+ strlen(NHLT_ACPI_HEADER_SIG)) != 0)) {
+ memunmap(nhlt_table);
+ dev_err(dev, "NHLT ACPI header signature incorrect\n");
+ return NULL;
+ }
return nhlt_table;
}