wlan: Page fault crash fix

Page fault crash fix
-Within RX thread try to alloc new frame for transfer finished
descriptor.
-When alloc new frame, iterator should be allocated and skb physical
address should be assigned.
-But just after iterator allocated, MC thread preempt and try to close
DXE channels.
-Then physical address is not assigned  or not allocated.

Change-Id: Ie769630be086cc910005a60a6ad5eaef7dbe1ded
CR-Fixed: 424290
1 file changed
tree: 42319d6d81222215d9036b2c6b03855213402346
  1. CORE/
  2. firmware_bin/
  3. riva/
  4. Android.mk
  5. Kbuild
  6. Kconfig
  7. Makefile