mini2440 linux2.6.32.2中i2c_master_send函数有bug？！

我在我的i2c驱动中使用i2c_master_send函数发送数据就会使得内核（2.6.32.2 for mini2440）崩溃，注释掉i2c_master_send后，就正常的，内核崩溃信息如下，各位大侠有能不能看出什么问题？

复制代码 Unable to handle kernel NULL pointer dereference at virtual address 00000000 pgd = c0004000 [00000000] *pgd=00000000 Internal error: Oops: 17 [#1] last sysfs file: /sys/devices/platform/s3c2440-i2c/i2c-0/0-005c/input/input0/event0/dev Modules linked in: i2c_ts CPU: 0    Not tainted  (2.6.32.2-FriendlyARM #9) PC is at s3c24xx_i2c_irq+0x32c/0x3dc LR is at handle_IRQ_event+0x60/0x130 pc : [<c0251fdc>]    lr : [<c0071500>]    psr: 80000093 sp : c04c3eb8  ip : 00000000  fp : c04c3edc r10: 3001fb24  r9 : 41129200  r8 : 00000004 r7 : ffffffea  r6 : 00000000  r5 : c382df24  r4 : c3841c00 r3 : 00000001  r2 : 00000000  r1 : c382df30  r0 : c480c000 Flags: Nzcv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment kernel Control: c000717f  Table: 339dc000  DAC: 00000017 Process swapper (pid: 0, stack limit = 0xc04c2270) Stack: (0xc04c3eb8 to 0xc04c4000) 3ea0:                                                       c3830d40 00000000 3ec0: 00000000 0000002b 3001fb58 41129200 c04c3efc c04c3ee0 c0071500 c0251cc0 3ee0: c04cbeec c3830d40 0000002b c0526fec c04c3f1c c04c3f00 c0073000 c00714b0 3f00: 0000002b c04d832c 00000000 c04c6448 c04c3f3c c04c3f20 c0030044 c0072f68 3f20: ffffffff f4000000 08000000 c04c6448 c04c3f94 c04c3f40 c0030b04 c0030010 3f40: f4100000 00000032 f4100000 60000013 c04c2000 c05038a4 c04c6450 c04c6448 3f60: 3001fb58 41129200 3001fb24 c04c3f94 c04c3f98 c04c3f88 c003264c c0032064 3f80: 60000013 ffffffff c04c3fb4 c04c3f98 c003264c c0031fe4 c052706c c0503640 3fa0: c0021000 c04c6448 c04c3fc4 c04c3fb8 c0392ebc c00325e4 c04c3ff4 c04c3fc8 3fc0: c00089a8 c0392e70 c00084f4 00000000 00000000 c0021ca0 00000000 c0007175 3fe0: c0503950 c0021c9c 00000000 c04c3ff8 30008034 c00087ac 00000000 00000000 Backtrace: [<c0251cb0>] (s3c24xx_i2c_irq+0x0/0x3dc) from [<c0071500>] (handle_IRQ_event+0x60/0x130) r9:41129200 r8:3001fb58 r7:0000002b r6:00000000 r5:00000000 r4:c3830d40 [<c00714a0>] (handle_IRQ_event+0x0/0x130) from [<c0073000>] (handle_edge_irq+0xa8/0x16c) r7:c0526fec r6:0000002b r5:c3830d40 r4:c04cbeec [<c0072f58>] (handle_edge_irq+0x0/0x16c) from [<c0030044>] (asm_do_IRQ+0x44/0x8c) r7:c04c6448 r6:00000000 r5:c04d832c r4:0000002b [<c0030000>] (asm_do_IRQ+0x0/0x8c) from [<c0030b04>] (__irq_svc+0x24/0xa0) Exception stack(0xc04c3f40 to 0xc04c3f88) 3f40: f4100000 00000032 f4100000 60000013 c04c2000 c05038a4 c04c6450 c04c6448 3f60: 3001fb58 41129200 3001fb24 c04c3f94 c04c3f98 c04c3f88 c003264c c0032064 3f80: 60000013 ffffffff r7:c04c6448 r6:08000000 r5:f4000000 r4:ffffffff [<c0031fd4>] (default_idle+0x0/0x9c) from [<c003264c>] (cpu_idle+0x78/0xb0) [<c00325d4>] (cpu_idle+0x0/0xb0) from [<c0392ebc>] (rest_init+0x5c/0x70) r7:c04c6448 r6:c0021000 r5:c0503640 r4:c052706c [<c0392e60>] (rest_init+0x0/0x70) from [<c00089a8>] (start_kernel+0x20c/0x27c) [<c000879c>] (start_kernel+0x0/0x27c) from [<30008034>] (0x30008034) Code: e5843010 eaffffd3 e5952008 e594002c (e7d2100c) ---[ end trace 4ede664953bd4d0e ]--- Kernel panic - not syncing: Fatal exception in interrupt Backtrace: [<c0035270>] (dump_backtrace+0x0/0x10c) from [<c0395674>] (dump_stack+0x18/0x1c) r7:c0251fdc r6:c0503eb0 r5:c04c3ccf r4:c0251fdc [<c039565c>] (dump_stack+0x0/0x1c) from [<c03956c4>] (panic+0x4c/0x134) [<c0395678>] (panic+0x0/0x134) from [<c0035580>] (die+0x204/0x240) r3:00010000 r2:c04c9638 r1:0000584d r0:c0454150 [<c003537c>] (die+0x0/0x240) from [<c0037934>] (__do_kernel_fault+0x6c/0x7c) [<c00378c8>] (__do_kernel_fault+0x0/0x7c) from [<c0037a8c>] (do_page_fault+0x148/0x200) r7:c04c57c0 r6:00000000 r5:00000000 r4:c04c6618 [<c0037944>] (do_page_fault+0x0/0x200) from [<c003028c>] (do_DataAbort+0x40/0xa4) [<c003024c>] (do_DataAbort+0x0/0xa4) from [<c0030ac0>] (__dabt_svc+0x40/0x60) Exception stack(0xc04c3e70 to 0xc04c3eb8) 3e60:                                     c480c000 c382df30 00000000 00000001 3e80: c3841c00 c382df24 00000000 ffffffea 00000004 41129200 3001fb24 c04c3edc 3ea0: 00000000 c04c3eb8 c0071500 c0251fdc 80000093 ffffffff [<c0251cb0>] (s3c24xx_i2c_irq+0x0/0x3dc) from [<c0071500>] (handle_IRQ_event+0x60/0x130) r9:41129200 r8:3001fb58 r7:0000002b r6:00000000 r5:00000000 r4:c3830d40 [<c00714a0>] (handle_IRQ_event+0x0/0x130) from [<c0073000>] (handle_edge_irq+0xa8/0x16c) r7:c0526fec r6:0000002b r5:c3830d40 r4:c04cbeec [<c0072f58>] (handle_edge_irq+0x0/0x16c) from [<c0030044>] (asm_do_IRQ+0x44/0x8c) r7:c04c6448 r6:00000000 r5:c04d832c r4:0000002b [<c0030000>] (asm_do_IRQ+0x0/0x8c) from [<c0030b04>] (__irq_svc+0x24/0xa0) Exception stack(0xc04c3f40 to 0xc04c3f88) 3f40: f4100000 00000032 f4100000 60000013 c04c2000 c05038a4 c04c6450 c04c6448 3f60: 3001fb58 41129200 3001fb24 c04c3f94 c04c3f98 c04c3f88 c003264c c0032064 3f80: 60000013 ffffffff r7:c04c6448 r6:08000000 r5:f4000000 r4:ffffffff [<c0031fd4>] (default_idle+0x0/0x9c) from [<c003264c>] (cpu_idle+0x78/0xb0) [<c00325d4>] (cpu_idle+0x0/0xb0) from [<c0392ebc>] (rest_init+0x5c/0x70) r7:c04c6448 r6:c0021000 r5:c0503640 r4:c052706c [<c0392e60>] (rest_init+0x0/0x70) from [<c00089a8>] (

有一个指针是空的，所以报错。


把你调用i2c_master_send函数的那一段代码贴出来，让我看看。

复制代码 struct i2c_ts_data{     struct i2c_client *client;     struct input_dev *input;     struct delayed_work work;     int irq; };

复制代码 struct work_struct *work; struct i2c_ts_data *tsdata = container_of(work,                              struct i2c_ts_data,                              work.work); …… if (i2c_master_send(tsdata->client, 0, 1) != 1) {           dev_err(&tsdata->client->dev, "Unable to write i2c index!\n");           goto out;       } …… out:         enable_irq(tsdata->irq);

这个代码是在一个中断里调用的。

是不是下面的container_of没有成功？

复制代码 struct i2c_ts_data *tsdata = container_of(work,                               struct i2c_ts_data,                               work.work);

这个很明显，s3c24xx_i2c_irq()里访问了空指针，有什么i2c的东西（应该是MINI2440相关的）没有配置？

使用了mini2440开发板上cemera上的I2c接口和IRQ_EINIT20 ，直接使用的

已经可以了，是tsdata的问题，有一个地方赋值的时候错误，没有声明为pointer！