Re: ac97 oops in ali modem driver

[Sasha Khapyorsky <sashak@smlink.com>]

On 21:01 Sun 02 Oct     , Dave Jones wrote:
> I just had a user file a Fedora bug with the following oops.

Is there other messages from ali5451 loading? The sound works I guess?
What do you see when 'ls /proc/asound/ali5451/codec97#0'?

Sasha.

> 
> Unable to handle kernel NULL pointer dereference at virtual address 000001a4
>  printing eip:
> df969005
> *pde = 12620067
> Oops: 0000 [#1]
> Modules linked in: nfs radeon drm nfsd exportfs lockd nfs_acl autofs4 sunrpc pcmcia dm_mod vid
> eo button battery ac yenta_socket rsrc_nonstatic pcmcia_core ohci_hcd shpchp i2c_ali1535 i2c_c
> ore snd_ali5451 snd_ac97_codec snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_de
> vice snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd soundcore snd_page_alloc prism54 8139cp m
> ii floppy joydev ext3 jbd
> CPU:    0
> EIP:    0060:[<df969005>]    Not tainted VLI
> EFLAGS: 00010202   (2.6.13-1.1526_FC4)
> EIP is at snd_ac97_valid_reg+0x5/0x135 [snd_ac97_codec]
> eax: 00000000   ebx: 00000040   ecx: 00000000   edx: 00000040
> esi: 00000000   edi: 00000040   ebp: 00001f40   esp: ca515edc
> ds: 007b   es: 007b   ss: 0068
> Process gstreamer-prope (pid: 10503, threadinfo=ca515000 task=da809aa0)
> Stack: 00000040 df969149 de2ac800 00000001 d4fb1000 de3bf560 df9207ca 00000000
>        fffffff4 de3bf560 db6b9000 df92d6b2 00000000 00000001 00000246 00000000
>        00000000 00000000 0000025c 0000025c d4fb1000 d4fb1000 fffffff4 de3bf560
> Call Trace:
>  [<df969149>] snd_ac97_write+0x14/0x5a [snd_ac97_codec]
>  [<df9207ca>] snd_ali_modem_hw_params+0x2c/0x4c [snd_ali5451]
>  [<df92d6b2>] snd_pcm_hw_params+0x290/0x609 [snd_pcm]
>  [<df92da7b>] snd_pcm_hw_params_user+0x50/0x6a [snd_pcm]
>  [<df9349b5>] snd_pcm_capture_ioctl1+0x2e/0x1ce [snd_pcm]
>  [<df934b70>] snd_pcm_capture_ioctl+0x0/0x1b [snd_pcm]
>  [<c01bf0e9>] do_ioctl+0x19/0x55
>  [<c01bf217>] vfs_ioctl+0x50/0x1aa
>  [<c01bf3ce>] sys_ioctl+0x5d/0x6b
>  [<c0104409>] sysenter_past_esp+0x56/0x79
> Code:  Bad EIP value.
> 
> 
> It looks like we're somehow ending up with card->ac97 == NULL.
> This kernel is based on 2.6.13.2, with no ALSA patches other than
> an unrelated emu10k1 diff.  From eyeballing a quick diff of
> the ali driver between 2.6.13.2 and current upstream 2.6.14rc3,
> it doesn't look like this has been addressed already.
> 
> 		Dave
> 
> 
> 
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