2.4.0-test2-ac2 FAT oops

[Samuli Kaski]

It's a Déja vû but since I haven't been contacted by any of the FAT
developers, I am resending (last one I had was with test1-ac9 IIRC).

I am not ruling out bad hardware. I am yet to receive word from Mr.
Hedrick about my ATA/66 (DMA) problems.

	Samuli

Jun 30 18:01:35 vortex kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000010 
Jun 30 18:01:35 vortex kernel:  printing eip: 
Jun 30 18:01:35 vortex kernel: c0160b30 
Jun 30 18:01:35 vortex kernel: *pde = 00000000 
Jun 30 18:01:35 vortex kernel: Oops: 0002 
Jun 30 18:01:35 vortex kernel: CPU:    0 
Jun 30 18:01:35 vortex kernel: EIP:    0010:[fat_cache_add+152/180] 
Jun 30 18:01:35 vortex kernel: EFLAGS: 00010246 
Jun 30 18:01:35 vortex kernel: eax: 00000000   ebx: 0004c477   ecx: 00000000   edx: c02d70d8 
Jun 30 18:01:35 vortex kernel: esi: 0004c345   edi: c2d15260   ebp: 00000132   esp: c06addbc 
Jun 30 18:01:35 vortex kernel: ds: 0018   es: 0018   ss: 0018 
Jun 30 18:01:35 vortex kernel: Process ncftp (pid: 1707, stackpage=c06ad000) 
Jun 30 18:01:35 vortex kernel: Stack: 00000132 c2d15260 00000132 c40f0180 21410be0 c0160c30 c2d15260 00000132  
Jun 30 18:01:35 vortex kernel:        0004c477 c5ba24bc 00000026 00000132 0004c477 c0160ccb c2d15260 00000132  
Jun 30 18:01:35 vortex kernel:        00000000 00004ca6 c2d15260 00000040 c01605fb c2d15260 00004ca6 c0162844  
Jun 30 18:01:35 vortex kernel: Call Trace: [fat_get_cluster+140/164] [default_fat_bmap+131/164] [fat_bmap+27/32] [fat_get_block+176/232] [__block_prepare_write+258/516] [tcp_recvmsg+1978/2540] [cont_prepare_write+509/724]  
Jun 30 18:01:35 vortex kernel:        [fat_get_block+0/232] [fat_prepare_write+38/44] [fat_get_block+0/232] [generic_file_write+874/1348] [default_fat_file_write+34/92] [fat_file_write+45/52] [sys_write+238/272] [system_call+52/56]  
Jun 30 18:01:35 vortex kernel:        [startup_32+43/199]  
Jun 30 18:01:35 vortex kernel: Code: c7 41 10 00 00 00 00 a1 40 70 2d c0 89 42 10 89 15 40 70 2d