diff --git a/drivers/acpi/acpi_tad.c b/drivers/acpi/acpi_tad.c
index fc43df083738..45459a4cafae 100644
--- a/drivers/acpi/acpi_tad.c
+++ b/drivers/acpi/acpi_tad.c
@@ -27,6 +27,7 @@
 #include <linux/kernel.h>
 #include <linux/ktime.h>
 #include <linux/module.h>
+#include <linux/mutex.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/rtc.h>
@@ -86,6 +87,8 @@ static bool acpi_tad_rt_is_invalid(struct acpi_tad_rt *rt)
 	    rt->daylight > 3;
 }
 
+static DEFINE_MUTEX(acpi_tad_aml_lock);
+
 static int acpi_tad_set_real_time(struct device *dev, struct acpi_tad_rt *rt)
 {
 	acpi_handle handle = ACPI_HANDLE(dev);
@@ -113,6 +116,8 @@ static int acpi_tad_set_real_time(struct device *dev, struct acpi_tad_rt *rt)
 	if (PM_RUNTIME_ACQUIRE_ERR(&pm))
 		return -ENXIO;
 
+	guard(mutex)(&acpi_tad_aml_lock);
+
 	status = acpi_evaluate_integer(handle, "_SRT", &arg_list, &retval);
 	if (ACPI_FAILURE(status) || retval)
 		return -EIO;
@@ -124,30 +129,27 @@ static int acpi_tad_evaluate_grt(struct device *dev, struct acpi_tad_rt *rt)
 {
 	acpi_handle handle = ACPI_HANDLE(dev);
 	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER };
-	union acpi_object *out_obj;
-	struct acpi_tad_rt *data;
 	acpi_status status;
 	int ret = -EIO;
 
+	guard(mutex)(&acpi_tad_aml_lock);
+
 	status = acpi_evaluate_object(handle, "_GRT", NULL, &output);
-	if (ACPI_FAILURE(status))
-		goto out_free;
+	if (ACPI_SUCCESS(status)) {
+		union acpi_object *out_obj;
 
-	out_obj = output.pointer;
-	if (out_obj->type != ACPI_TYPE_BUFFER)
-		goto out_free;
+		out_obj = output.pointer;
+		if (out_obj->type == ACPI_TYPE_BUFFER &&
+		    out_obj->buffer.length == sizeof(*rt)) {
+			struct acpi_tad_rt *data;
 
-	if (out_obj->buffer.length != sizeof(*rt))
-		goto out_free;
-
-	data = (struct acpi_tad_rt *)(out_obj->buffer.pointer);
-	if (!data->valid)
-		goto out_free;
-
-	memcpy(rt, data, sizeof(*rt));
-	ret = 0;
-
-out_free:
+			data = (struct acpi_tad_rt *)(out_obj->buffer.pointer);
+			if (data->valid) {
+				memcpy(rt, data, sizeof(*rt));
+				ret = 0;
+			}
+		}
+	}
 	ACPI_FREE(output.pointer);
 	return ret;
 }
@@ -193,6 +195,8 @@ static int __acpi_tad_wake_set(struct device *dev, char *method, u32 timer_id,
 	args[0].integer.value = timer_id;
 	args[1].integer.value = value;
 
+	guard(mutex)(&acpi_tad_aml_lock);
+
 	status = acpi_evaluate_integer(handle, method, &arg_list, &retval);
 	if (ACPI_FAILURE(status) || retval)
 		return -EIO;
@@ -215,6 +219,8 @@ static int __acpi_tad_wake_read(struct device *dev, char *method, u32 timer_id,
 
 	args[0].integer.value = timer_id;
 
+	guard(mutex)(&acpi_tad_aml_lock);
+
 	status = acpi_evaluate_integer(handle, method, &arg_list, retval);
 	if (ACPI_FAILURE(status))
 		return -EIO;
@@ -416,6 +422,8 @@ static int acpi_tad_clear_status(struct device *dev, u32 timer_id)
 	if (PM_RUNTIME_ACQUIRE_ERR(&pm))
 		return -ENXIO;
 
+	guard(mutex)(&acpi_tad_aml_lock);
+
 	status = acpi_evaluate_integer(handle, "_CWS", &arg_list, &retval);
 	if (ACPI_FAILURE(status) || retval)
 		return -EIO;
@@ -456,6 +464,8 @@ static ssize_t acpi_tad_status_read(struct device *dev, char *buf, u32 timer_id)
 	if (PM_RUNTIME_ACQUIRE_ERR(&pm))
 		return -ENXIO;
 
+	guard(mutex)(&acpi_tad_aml_lock);
+
 	status = acpi_evaluate_integer(handle, "_GWS", &arg_list, &retval);
 	if (ACPI_FAILURE(status))
 		return -EIO;