设备驱动修改后需要重新启动吗

aq_mail

编了个设备驱动，每次重新make后再rmmon , insmod后在运行应用程序，内核总是报告内存错误，但是重新驱动后就好了，这是为什么呢？

dreamice

原帖由 aq_mail 于 2008-11-13 11:35 发表
编了个设备驱动，每次重新make后再rmmon , insmod后在运行应用程序，内核总是报告内存错误，但是重新驱动后就好了，这是为什么呢？

在哪一步报的错误？

Godbach

把原始的错误信息贴出来，不要自己加工

aq_mail

报错如下：


temp opeUnable to handle kernel paging request at virtual address 35376d6c
n OK!
pgd = c2424000
[35376d6c] *pgd=00000000
Internal error: Oops: 0 [#1] PREEMPT
Modules linked in: lm75
CPU: 0    Not tainted  (2.6.22.10 #7)
PC is at 0x35376d6c
LR is at do_ioctl+0xa8/0xd0
pc : [<35376d6c>]    lr : [<c01857cc>]    psr: 20000013
sp : c1bbff30  ip : 35376d6c  fp : c1bbff4c
r10: 00900036  r9 : c1bbe000  r8 : c0120814
r7 : 00000000  r6 : bef02cdc  r5 : c1ae8c20  r4 : 35376d6c
r3 : bef02cdc  r2 : 00000000  r1 : c1ae8c20  r0 : c1af8268
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  Segment user
Control: 0005317f  Table: c2424000  DAC: 00000015
Process hb1030_tempt (pid: 195, stack limit = 0xc1bbe260)
Stack: (0xc1bbff30 to 0xc1bc0000)
ff20:                                     00000003 c1ae8c20 bef02cdc c1ae8c20
ff40: c1bbff7c c1bbff50 c0185aa4 c0185734 c0178c4c c0252234 00000003 00000003
ff60: bef02cdc 00000000 c0120814 c1bbe000 c1bbffa4 c1bbff80 c0185b08 c0185804
ff80: c0126a10 00000000 00000003 bef02cf0 000083f4 00000036 00000000 c1bbffa8
ffa0: c0120020 c0185ad8 00000003 bef02cf0 00000003 00000000 bef02cdc bef02cd8
ffc0: 00000003 bef02cf0 000083f4 4005aea8 bef02d74 00000001 00008368 000084cc
ffe0: 40019808 bef02cc4 00008504 40019828 20000010 00000003 00000003 00000004
Backtrace:
[<c0185724>] (do_ioctl+0x0/0xd0) from [<c0185aa4>] (vfs_ioctl+0x2b0/0x2d4)
r7:c1ae8c20 r6:bef02cdc r5:c1ae8c20 r4:00000003
[<c01857f4>] (vfs_ioctl+0x0/0x2d4) from [<c0185b08>] (sys_ioctl+0x40/0x64)
r9:c1bbe000 r8:c0120814 r6:00000000 r5:bef02cdc r4:00000003
[<c0185ac8>] (sys_ioctl+0x0/0x64) from [<c0120020>] (ret_fast_syscall+0x0/0x2c)
r7:00000036 r6:000083f4 r5:bef02cf0 r4:00000003
Code: bad PC value.
Unable to handle kernel NULL pointer dereference at virtual address 00000004
pgd = c0104000
[00000004] *pgd=00000000
Internal error: Oops: 0 [#2] PREEMPT
Modules linked in: lm75
CPU: 0    Not tainted  (2.6.22.10 #7)
PC is at 0x4
LR is at filp_close+0x4c/0x78
pc : [<00000004>]    lr : [<c0176890>]    psr: 20000013
sp : c1bbfdd8  ip : c1bbfdf8  fp : c1bbfdf4
r10: 00000000  r9 : c05fa380  r8 : 00000000
r7 : c049f8e8  r6 : c049f8e0  r5 : 00000001  r4 : c1ae8c20
r3 : 00000004  r2 : c1bbe000  r1 : c049f8e0  r0 : c1ae8c20
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  Segment user
Control: 0005317f  Table: c2424000  DAC: 00000015
Process hb1030_tempt (pid: 195, stack limit = 0xc1bbe260)
Stack: (0xc1bbfdd8 to 0xc1bc0000)
fdc0:                                                       c1bbfdfc c049f8e0
fde0: 00000001 0000000c c1bbfe1c c1bbfdf8 c01392ac c0176854 c049f8e0 c048f0a0
fe00: bf000000 00000001 0000000b c0364b9c c1bbfe44 c1bbfe20 c013a894 c013923c
fe20: 00000000 bf000000 c1bbfe44 c1bbfe38 c0136f8c 00000000 c1bbfe54 c1bbfe48
fe40: c0124744 c013a630 c1bbfe74 c1bbfe58 c0126734 c01244d0 ffffffec c1bbff1c
fe60: c048f0a0 c0613910 c1bbfebc c1bbfe78 c0126958 c01266d8 60000013 ffffffff
fe80: c1bbfe9c c1bbfe90 c1bbfee8 00000000 c1bbfeb4 ffffffff c1bbff1c bef02cdc
fea0: 00000000 c0120814 60000013 00900036 c1bbfed4 c1bbfec0 c0126a10 c0126754
fec0: c1ae84a0 ffffffff c1bbfee4 c1bbfed8 c011f1ec c0126a04 c1bbff4c c1bbfee8
fee0: c011fcac c011f1e4 c1af8268 c1ae8c20 00000000 bef02cdc 35376d6c c1ae8c20
ff00: bef02cdc 00000000 c0120814 c1bbe000 00900036 c1bbff4c 35376d6c c1bbff30
ff20: c01857cc 35376d6c 20000013 ffffffff 00000003 c1ae8c20 bef02cdc c1ae8c20
ff40: c1bbff7c c1bbff50 c0185aa4 c0185734 c0178c4c c0252234 00000003 00000003
ff60: bef02cdc 00000000 c0120814 c1bbe000 c1bbffa4 c1bbff80 c0185b08 c0185804
ff80: c0126a10 00000000 00000003 bef02cf0 000083f4 00000036 00000000 c1bbffa8
ffa0: c0120020 c0185ad8 00000003 bef02cf0 00000003 00000000 bef02cdc bef02cd8
ffc0: 00000003 bef02cf0 000083f4 4005aea8 bef02d74 00000001 00008368 000084cc
ffe0: 40019808 bef02cc4 00008504 40019828 20000010 00000003 00000003 00000004
Backtrace:
[<c0176844>] (filp_close+0x0/0x78) from [<c01392ac>] (put_files_struct+0x80/0xd4)
r6:0000000c r5:00000001 r4:c049f8e0
[<c013922c>] (put_files_struct+0x0/0xd4) from [<c013a894>] (do_exit+0x274/0x920)
[<c013a620>] (do_exit+0x0/0x920) from [<c0124744>] (die+0x284/0x2e0)
[<c01244c0>] (die+0x0/0x2e0) from [<c0126734>] (__do_kernel_fault+0x6c/0x7c)
[<c01266c8>] (__do_kernel_fault+0x0/0x7c) from [<c0126958>] (do_page_fault+0x214/0x22c)
r7:c0613910 r6:c048f0a0 r5:c1bbff1c r4:ffffffec
[<c0126744>] (do_page_fault+0x0/0x22c) from [<c0126a10>] (do_translation_fault+0x1c/0x80)
[<c01269f4>] (do_translation_fault+0x0/0x80) from [<c011f1ec>] (do_PrefetchAbort+0x18/0x1c)
r4:ffffffff
[<c011f1d4>] (do_PrefetchAbort+0x0/0x1c) from [<c011fcac>] (__pabt_svc+0x4c/0x80)
Exception stack(0xc1bbfee8 to 0xc1bbff30)
fee0:                   c1af8268 c1ae8c20 00000000 bef02cdc 35376d6c c1ae8c20
ff00: bef02cdc 00000000 c0120814 c1bbe000 00900036 c1bbff4c 35376d6c c1bbff30
ff20: c01857cc 35376d6c 20000013 ffffffff                                    
[<c0185724>] (do_ioctl+0x0/0xd0) from [<c0185aa4>] (vfs_ioctl+0x2b0/0x2d4)
r7:c1ae8c20 r6:bef02cdc r5:c1ae8c20 r4:00000003
[<c01857f4>] (vfs_ioctl+0x0/0x2d4) from [<c0185b08>] (sys_ioctl+0x40/0x64)
r9:c1bbe000 r8:c0120814 r6:00000000 r5:bef02cdc r4:00000003
[<c0185ac8>] (sys_ioctl+0x0/0x64) from [<c0120020>] (ret_fast_syscall+0x0/0x2c)
r7:00000036 r6:000083f4 r5:bef02cf0 r4:00000003
Code: bad PC value.
Fixing recursive fault but reboot is needed!

[ 本帖最后由 dreamice 于 2008-11-13 13:06 编辑 ]

Godbach

这个应该是OOPS了。

temp opeUnable to handle kernel paging request at virtual address 35376d6c

看看分配内存是否成功以及访问内存是否非法

dreamice

把代码贴出来，你这个是kernel panic了。
系统刚启动的时候，不会有那么多模块在跑，所以你加载模块的时候可能不会马上出现kernel panic。
而当系统跑起来一会儿后，你再加载，就立竿见影了

Godbach

Unable to handle kernel NULL pointer dereference at virtual address 00000004

这都是使用非法内存的原因

dreamice

原帖由 Godbach 于 2008-11-13 13:09 发表


这都是使用非法内存的原因

可能又是野指针造成的

Godbach

原帖由 dreamice 于 2008-11-13 13:13 发表


可能又是野指针造成的

基本上属于引用了系统保护的内存地址，或者就是NULL