do_map_probe function problem.

[Vikram Mehta]

Hi folks

I get an error in do_map_probe function.

Code  never returns from this line

drv = get_mtd_chip_driver(name);
if (!drv && !request_module(name))
  drv = get_mtd_chip_driver(name);
 if (!drv)
  return NULL;
ret = drv->probe(map);

What could be going here. Where can I find the defninition of 
struct mtd_chip_driver

Vikram