Re: Not important oops

[Takashi Iwai <tiwai@suse.de>]

At Wed, 21 Jan 2004 13:55:53 +0100,
p z oooo wrote:
> 
> Hi,
> 
> When I remove control through hwdep layer on emu10k1 
> driver when in use by oss emulation I got oops. 
> This is because oss emulation holds pointer to this control.
> Is there any api to disable an then enable oss emulation or 
> only proc interface ???

hmm weird, the access to ctl elements in mixer_oss.c is restricted
with card->controls_rwsem.  since snd_emu10k1_del_controls issues
down_write() for it, it must be safe...


Takashi

> 
> Jan 20 20:53:52 localhost kernel: Unable to handle kernel NULL 
> pointer dereference at virtual address 000000b0
> Jan 20 20:53:52 localhost kernel:  printing eip:
> Jan 20 20:53:52 localhost kernel: e8edc94b
> Jan 20 20:53:52 localhost kernel: *pde = 0567b067
> Jan 20 20:53:52 localhost kernel: *pte = 00000000
> Jan 20 20:53:52 localhost kernel: Oops: 0000
> Jan 20 20:53:52 localhost kernel: snd-pcm-oss snd-mixer-oss evdev 
> tuner saa7134 video-buf v4l2-common v4l1-compat ir-common videodev 
> w83781d i2c-isa eeprom i2c-proc i2c-viapro i2c-dev i2c-core
> Jan 20 20:53:52 localhost kernel: CPU:    0
> Jan 20 20:53:52 localhost kernel: EIP:    0060:[<e8edc94b>]    
> Tainted: P
> Jan 20 20:53:52 localhost kernel: EFLAGS: 00010286
> Jan 20 20:53:52 localhost kernel:
> Jan 20 20:53:52 localhost kernel: EIP is at snd_emu10k1_gpr_ctl_info 
> [snd-emu10k1] 0xb (2.4.22-1.2115.nptlcustom)
> Jan 20 20:53:52 localhost kernel: eax: daf33cc0   ebx: daf33cc0   
> ecx: daa8ce00   edx: 00000000
> Jan 20 20:53:52 localhost kernel: esi: daa8ce00   edi: c5ff8000   
> ebp: d4795f60   esp: d4795ef4
> Jan 20 20:53:52 localhost kernel: ds: 0068   es: 0068   ss: 0068
> Jan 20 20:53:52 localhost kernel: Process xine (pid: 4800, 
> stackpage=d4795000)
> Jan 20 20:53:52 localhost kernel: Stack: e9040ded daf33cc0 daa8ce00 
> 00000000 00000000 d4795f64 dd93a0e4 dd2bf400
> Jan 20 20:53:52 localhost kernel:        dadb7000 dadb714c c9a9d200 
> e90411d7 c9a9d200 dd93a0e4 daf33cc0 d4795f60
> Jan 20 20:53:52 localhost kernel:        d4795f64 dffef300 dd93a0e4 
> c9a9d200 c52ae540 c9a9d200 e90406cf c9a9d200
> Jan 20 20:53:52 localhost kernel: Call Trace:   [<e9040ded>] 
> snd_mixer_oss_get_volume1_vol [snd-mixer-oss] 0x6d (0xd4795ef4)
> Jan 20 20:53:52 localhost kernel: [<e90411d7>] 
> snd_mixer_oss_get_volume1 [snd-mixer-oss] 0x207 (0xd4795f20)
> Jan 20 20:53:52 localhost kernel: [<e90406cf>] 
> snd_mixer_oss_get_volume [snd-mixer-oss] 0x9f (0xd4795f4c)
> Jan 20 20:53:52 localhost kernel: [<e904086d>] snd_mixer_oss_ioctl1 
> [snd-mixer-oss] 0xcd (0xd4795f70)
> Jan 20 20:53:52 localhost kernel: [<e9040b30>] snd_mixer_oss_ioctl 
> [snd-mixer-oss] 0x0 (0xd4795f90)
> Jan 20 20:53:52 localhost kernel: [<c015570c>] sys_ioctl [kernel] 
> 0xbc (0xd4795f94)
> Jan 20 20:53:52 localhost kernel: [<c014561a>] sys_open [kernel] 0x8a 
> (0xd4795fa8)
> Jan 20 20:53:52 localhost kernel: [<c01099df>] system_call [kernel] 
> 0x33 (0xd4795fc0)
> Jan 20 20:53:52 localhost kernel:
> Jan 20 20:53:52 localhost kernel:
> Jan 20 20:53:52 localhost kernel: Code: 8b 82 b0 00 00 00 85 c0 75 09 
> 83 ba b4 00 00 00 01 74 22 c7 
> 
> 
> 
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