Use a big-lock for kernel sychronization instead of fine-grained locking

kernel/device/storage/partitions.c

@@ -14,8 +14,6 @@
 
 static int device_probe_partitions_dos(struct proc* proc, struct reschedule_ctx* rctx,
                                        struct device* device) {
-  uint64_t fd, fsd;
-
   struct dos_mbr mbr;
   memset(&mbr, 0, sizeof(mbr));
   size_t sector = 0;
@@ -31,19 +29,15 @@ static int device_probe_partitions_dos(struct proc* proc, struct reschedule_ctx*
       [XDRV_PARTITION_RESCAN] = &partdrv_partition_rescan,
   };
 
-  spin_lock(&device->lock, &fd);
+  device_op(device, XDRV_GET_SECTOR_SIZE, proc, rctx, &sector_size);
 
-  device_op(device, XDRV_GET_SECTOR_SIZE, proc, rctx, &fd, &sector_size);
-
-  int ret = device_op(device, XDRV_READ, proc, rctx, &fd, &sector, &sector_count, &mbr);
+  int ret = device_op(device, XDRV_READ, proc, rctx, &sector, &sector_count, &mbr);
 
   if (ret < 0) {
-    spin_unlock(&device->lock, fd);
     return ret;
   }
 
   if (!(mbr.valid_sign[0] == 0x55 && mbr.valid_sign[1] == 0xAA)) {
-    spin_unlock(&device->lock, fd);
     return -ST_PARTITION_ERROR;
   }
 
@@ -63,13 +57,9 @@ static int device_probe_partitions_dos(struct proc* proc, struct reschedule_ctx*
     struct device* part_dev = device_create(DEVICE_TYPE_DRIVE, key, ops, lengthof(ops),
                                             &partdrv_init, &partdrv_fini, &init, proc, rctx);
 
-    spin_lock(&part_dev->lock, &fsd);
     list_append(device->subdevices, &part_dev->subdevices_link);
-    spin_unlock(&part_dev->lock, fsd);
   }
 
-  spin_unlock(&device->lock, fd);
-
   return ST_OK;
 }