pci_alloc_consistent 竟然不能多次申请内存????

  我在内核为2.6.18中使用pci_alloc_consistent()申请内存时,发现竟然不能多次申请,会出错,而代码在内核为2.4.13中又是OK的,搞得我都糊涂了,你们帮看看代码那里有问题????????

#define MAX_BUFFER_COUNT    16

static int __devinit drv_dm642_probe(struct pci_dev *pcidev,
                                      const struct pci_device_id *devid)
{
    static u32 *cpu_zeroes[MAX_BUFFER_COUNT];
      static dma_addr_t zeroes[MAX_BUFFER_COUNT];    
      .....   //略
    ulLen = 20+(128+128*1024);

      printk("drv_dm642_probe() module enable irq ok\n");
      for(i = 0; i < MAX_BUFFER_COUNT; ++i)
      {
           printk("::::::::::::::::::::::pci_alloc_consistent  :: start \n");    
           cpu_zeroes = pci_alloc_consistent(pcidev, ulLen, &(zeroes));
           printk("::::::::::::::::::::::::::::::::pci_alloc_consistent  :: end \n");    
           if(NULL == cpu_zeroes )
           {
     printk("11::s->video_buf_info_addr[%d] pci_alloc_consistent error\n",i);
     goto fail3;
           }
           printk("i[%d]  :: cpu_zeroes[0x%8x], zeroes[0x%8x]\n",
                       i, (unsigned int) cpu_zeroes, (unsigned int) zeroes);
           memset(cpu_zeroes, 0, ulLen);
      }
    fail3:
        .......   //略
}

打印信息如下:

drv_dm642_probe() module enable irq ok
::::::::::::::::::::::pci_alloc_consistent  :: start
::::::::::::::::::::::::::::::::pci_alloc_consistent  :: end
i[0]  :: cpu_zeroes[0xff103000], zeroes[0x ee00000]
::::::::::::::::::::::pci_alloc_consistent  :: start
::::::::::::::::::::::::::::::::pci_alloc_consistent  :: end
i[1]  :: cpu_zeroes[0xff124000], zeroes[0x e100000]
::::::::::::::::::::::pci_alloc_consistent  :: start
::::::::::::::::::::::::::::::::pci_alloc_consistent  :: end
i[2]  :: cpu_zeroes[0xff145000], zeroes[0x  540000]
::::::::::::::::::::::pci_alloc_consistent  :: start
::::::::::::::::::::::::::::::::pci_alloc_consistent  :: end
i[3]  :: cpu_zeroes[0xff166000], zeroes[0x e140000]
::::::::::::::::::::::pci_alloc_consistent  :: start
::::::::::::::::::::::::::::::::pci_alloc_consistent  :: end
i[4]  :: cpu_zeroes[0xff187000], zeroes[0x e680000]
::::::::::::::::::::::pci_alloc_consistent  :: start
::::::::::::::::::::::::::::::::pci_alloc_consistent  :: end
i[5]  :: cpu_zeroes[0xff1a8000], zeroes[0x e6c0000]
::::::::::::::::::::::pci_alloc_consistent  :: start
::::::::::::::::::::::::::::::::pci_alloc_consistent  :: end
i[6]  :: cpu_zeroes[0xff1c9000], zeroes[0x ea00000]
::::::::::::::::::::::pci_alloc_consistent  :: start
kernel BUG in __dma_alloc_coherent at arch/ppc/kernel/dma-mapping.c:233!
Oops: Exception in kernel mode, sig: 5 [#1]
NIP: C0004D3C LR: C0004D08 CTR: 00000000
REGS: cea8fc70 TRAP: 0700   Not tainted  (2.6.18-rc2)
MSR: 00029000 <EE,ME>  CR: 84084084  XER: 00000000
TASK = cfe67090[53] 'insmod' THREAD: cea8e000
GPR00: 00000001 CEA8FD20 CFE67090 C04CD100 0000003F 0000001F CEA60FFC 00029000
GPR08: 00000000 00000000 CFF13020 00000400 24084028 1008C868 00000000 00000000
GPR16: 00000000 00000000 00000124 00000000 D5099BDE C02D0000 C0260000 00000006
GPR24: CEE99E80 C025E40C FF2DF000 D1067750 C04CD100 CFF2E000 C04CCBC0 0000B000
NIP [C0004D3C] __dma_alloc_coherent+0x220/0x2ec
LR [C0004D08] __dma_alloc_coherent+0x1ec/0x2ec
Call Trace:
[CEA8FD20] [C0004C60] __dma_alloc_coherent+0x144/0x2ec (unreliable)
[CEA8FD60] [D10691D4] drv_dm642_probe+0xac/0x660 [dm642drv]
[CEA8FD90] [C011B3A0] pci_device_probe+0x80/0xa0
[CEA8FDB0] [C0133670] driver_probe_device+0x60/0x118
[CEA8FDD0] [C01338A8] __driver_attach+0xcc/0xf8
[CEA8FDF0] [C0132AFC] bus_for_each_dev+0x54/0x90
[CEA8FE20] [C01334D8] driver_attach+0x24/0x34
[CEA8FE30] [C0132F3C] bus_add_driver+0x84/0x144
[CEA8FE50] [C0133D90] driver_register+0x70/0xb8
[CEA8FE60] [C011B030] __pci_register_driver+0x44/0x54
[CEA8FE70] [D1069030] drv_dm642_init+0x30/0x128 [dm642drv]
[CEA8FE90] [C00345F8] sys_init_module+0xe8/0x157c
[CEA8FF40] [C0001C88] ret_from_syscall+0x0/0x3c
Instruction dump:
3d20c02d 8169c0dc 7c00f050 54003826 7c005a14 901b0000 815d0004 39200000
7d205379 38000000 41820008 38000001 <0f000000> 38000400 7d60f028 7d6b0378
Trace/breakpoint trap

内存信息如下:
~ # lspci
00:0c.0 Class 0400: 104c:a002 (rev 01)    //本人PCI设备信息
~ # cat /proc/iomem
50000100-5000017f : musbhsfc.0
a0000000-afffffff : PCI host bridge
  af000000-af7fffff : 0000:00:0c.0  
  afc00000-afffffff : 0000:00:0c.0
ef601000-ef60107f : ppc-soc-ohci.0
  ef601000-ef60107f : ohci_hcd
~ # cat /proc/meminfo
MemTotal:       257004 kB
MemFree:        186288 kB
Buffers:         64000 kB
Cached:           1836 kB
SwapCached:          0 kB
Active:           2528 kB
Inactive:        64040 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:       257004 kB
LowFree:        186288 kB
SwapTotal:           0 kB
SwapFree:            0 kB
Dirty:               0 kB
Writeback:           0 kB
AnonPages:         776 kB
Mapped:           1076 kB
Slab:             1768 kB
PageTables:        136 kB
NFS Unstable:        0 kB
Bounce:              0 kB
CommitLimit:    128500 kB
Committed_AS:     3156 kB
VmallocTotal:   737200 kB
VmallocUsed:     65964 kB
VmallocChunk:   671148 kB
~ # free
              total         used         free       shared      buffers
  Mem:       257004        70716       186288            0        64000
 Swap:            0            0            0
Total:       257004        70716       186288