int output_id;
        int speaker_id;
        struct tas_drce_t drce_state;
+       struct work_struct change;
 };
 
 
 }
 
 static void
-tas3001c_device_change_handler(void *self)
+tas3001c_device_change_handler(struct work_struct *work)
 {
-       if (self)
-               tas3001c_update_device_parameters(self);
+       struct tas3001c_data_t *self;
+       self = container_of(work, struct tas3001c_data_t, change);
+       tas3001c_update_device_parameters(self);
 }
 
-static struct work_struct device_change;
-
 static int
 tas3001c_output_device_change( struct tas3001c_data_t *self,
                                int device_id,
        self->output_id=output_id;
        self->speaker_id=speaker_id;
 
-       schedule_work(&device_change);
+       schedule_work(&self->change);
        return 0;
 }
 
                        tas3001c_write_biquad_shadow(self, i, j,
                                &tas3001c_eq_unity);
 
-       INIT_WORK(&device_change, tas3001c_device_change_handler, self);
+       INIT_WORK(&self->change, tas3001c_device_change_handler);
        return 0;
 }
 
 
        int output_id;
        int speaker_id;
        struct tas_drce_t drce_state;
+       struct work_struct change;
 };
 
 #define MAKE_TIME(sec,usec) (((sec)<<12) + (50000+(usec/10)*(1<<12))/100000)
 }
 
 static void
-tas3004_device_change_handler(void *self)
+tas3004_device_change_handler(struct work_struct *work)
 {
-       if (!self) return;
-
-       tas3004_update_device_parameters((struct tas3004_data_t *)self);
+       struct tas3004_data_t *self;
+       self = container_of(work, struct tas3004_data_t, change);
+       tas3004_update_device_parameters(self);
 }
 
-static struct work_struct device_change;
-
 static int
 tas3004_output_device_change(  struct tas3004_data_t *self,
                                int device_id,
        self->output_id=output_id;
        self->speaker_id=speaker_id;
 
-       schedule_work(&device_change);
+       schedule_work(&self->change);
 
        return 0;
 }
        tas3004_write_register(self, TAS3004_REG_MCR2, &mcr2, WRITE_SHADOW);
        tas3004_write_register(self, TAS3004_REG_DRC, drce_init, WRITE_SHADOW);
 
-       INIT_WORK(&device_change, tas3004_device_change_handler, self);
+       INIT_WORK(&self->change, tas3004_device_change_handler);
        return 0;
 }