before hw_module->methods->open(hw_module, GRALLOC_HARDWARE_GPU0, (struct hw_device_t**) &alloc_dev);

http://bazaar.launchpad.net/~mir-team/mir/development-branch/view/head:/src/platforms/android/server/android_buffer_allocator.cpp#L63

(gdb) p *alloc_dev
$17 = {common = {tag = 3058625476, version = 1, module = 0x1, reserved = {
      3058628732, 242944, 33, 3066640340, 3066640340, 1731033205, 1634039150, 
      1718118754, 1919511855, 32, 32, 242864}, close = 0xb6ff9000}, 
  alloc = 0xb6fff568 <_rtld_global+1304>, free = 0x0, dump = 0x3c368, 
  reserved_proc = {0xb6ff9000, 0xb6fff568 <_rtld_global+1304>, 0x121, 
    0xb6c938ec, 0xb6c938ec, 0xffffffff, 0x7273752f}}


after

(gdb) p *alloc_dev
$27 = {common = {tag = 1213678676, version = 0, module = 0xb64a6004, 
    reserved = {0 <repeats 12 times>}, close = 0xb64a3475}, alloc = 0x0, 
  free = 0xb64a39d5, dump = 0xb64a3a7d, reserved_proc = {0x0, 0x0, 0x0, 0x0, 
    0x0, 0x0, 0x0}}