Hi Jan, I started the tests and had problems on unloading the module.

I am probably doing something wrong but I think the driver shouldn't crash.
Probably it is missing some sanity checks on rtdm_munmap like 

if (! (user_info && user_info->mm))
        return -EXXX;

I'll investigate the problems... I had some unexpected things to investigate 
today and haven't had enought time to test the patch but hopefully I'll do it 
on monday...

That was the result:

Unable to handle kernel NULL pointer dereference at virtual address 00000030
 printing eip:
*pde = 00000000
Oops: 0002 [#1]
Modules linked in: rt_dt3153 parport_pc lp parport af_packet nls_iso8859_1 
nls_cp437 v4l2_common videodev video_buf xeno_rtdm xeno_native xeno_nucleus 
snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq 
snd_seq_device snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_pcm_oss 
snd_mixer_oss snd_pcm e100 mii snd_timer evdev snd soundcore snd_page_alloc 
hw_random i2c_i801 i2c_core ehci_hcd intel_agp agpgart ide_cd uhci_hcd 
usbcore cdrom
CPU:    0
EIP:    0060:[<e0a1f2fc>]    Not tainted VLI
EFLAGS: 00010286   (
EIP is at rtdm_munmap+0x11/0x44 [xeno_rtdm]
eax: 00000030   ebx: d2e45a70   ecx: 00000000   edx: ffff0001
esi: bfd72660   edi: 00000880   ebp: c2b20000   esp: c2b21f4c
ds: 007b   es: 007b   ss: 0068
Process rmmod (pid: 4254, threadinfo=c2b20000 task=d70bf550)
Stack: e0bfafa0 bfd72660 e0bf7cbc d2e45a70 b7d92000 00096000 e0bfad80 c0132e0d
       645f7472 35313374 c0320033 00000246 c03fa4cc c013c881 00000021 c0324200
       00000246 c2b21fbc 00000021 00000001 c0324200 bfd72660 00d72660 00000000
Call Trace:
 [<e0bf7cbc>] cleanup_module+0x24/0x50 [rt_dt3153]
 [<c0132e0d>] sys_delete_module+0x12e/0x15f
 [<c013c881>] __ipipe_dispatch_event+0x56/0xd5
 [<c0102fc8>] syscall_call+0x7/0xb
Code: 5f 89 e8 81 fd 18 fc ff ff 77 08 8b 5c 24 2c 89 2b 31 c0 59 5b 5b 5e 5f 
5d c3 56 53 8b 5c 24 0c 8b 4b 78 8d 41 30 ba 01 00 ff ff <0f> c1 10 85 d2 75 
4c ff 74 24 14 ff 74 24 14 ff 73 78 e8 2f 02



Em Quinta 09 Fevereiro 2006 22:37, Jan Kiszka escreveu:

>Jan Kiszka wrote:
>> Hi all,
>> this is a first attempt to add the requested mmap functionality to the
>> RTDM driver API.
>... and this version is even more useful than the previous one (now with
>EXPORT_SYMBOL!). Be warned: I just compiled it, I count on third-party

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