ML403 AC97 ALSA Driver problem

hi all

when i use the ac97driver posted by Joachim F=C3=B6rster recently,there is=
a
kernel stack overflow while testing .

Does anybody kindly suggest me to take some step to find out the problem? Thanks

Joachim F=C3=B6rster 's driver here:
http://www.nabble.com/Re%3A--PATCHv2-1-2--Xilinx-ML403-AC97-Controller-Refe=
rence-device-driver-p12106850.html

testing program is alsa-app aplay ,the output here:=20

# strace aplay /root/aq_ac97/yonggan.wav
execve("/usr/bin/aplay", ["aplay", "/root/aq_ac97/yonggan.wav"], [/* 7 vars
*/]) =3D 0
uname({sys=3D"Linux", node=3D"(none)", ...}) =3D 0
brk(0)                                  =3D 0x10022000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
=3D
0x30017000
access("/etc/ld.so.preload", R_OK)      =3D -1 ENOENT (No such file or
directory)
open("/etc/ld.so.cache", O_RDONLY)      =3D 3
fstat64(3, {st_mode=3DS_IFREG|0644, st_size=3D17602, ...}) =3D 0
mmap(NULL, 17602, PROT_READ, MAP_PRIVATE, 3, 0) =3D 0x30018000
close(3)                                =3D 0
open("/lib/tls/ppc405/libasound.so.2", O_RDONLY) =3D -1 ENOENT (No such fil=
e
or directory)
stat64("/lib/tls/ppc405", 0x7ffec288)   =3D -1 ENOENT (No such file or
directory)
open("/lib/tls/libaso[   30.843423] Kernel stack overflow in process
c02dcb90, r1=3Dc02d3f30

# aplay yonggan.wav
Playing WAVE 'yonggan.wav' : Signed 16 bit Little Endian, Rate 44100 Hz,
Stereo
[   82.689668] Kernel stack overflow in process c02a6490, r1=3Dc02f7f30
[   82.763235] Oops: kernel access of bad area, sig: 11 [#1]
[   82.827330] NIP: C001327C LR: C001666C CTR: 00000000
[   82.886699] REGS: c01931f0 TRAP: 0300   Not tainted  (2.6.20)
[   82.955428] MSR: 00021030 <ME,IR,DR>  CR: 28000028  XER: 00000000
[   83.028333] DAR: 00000005, DSISR: 00000000
[   83.077290] TASK =3D c02a6490[134] 'xsysace' THREAD: c02f8000
[   83.141855] GPR00: 00000001 C01932A0 C02A6490 00000000 C01B3770 00000012
00000300 00000010
[   83.241838] GPR08: FFFFFFFA 00000020 00000000 00000005 00000000 FFFF87B8
03FD0700 00000000
[   83.341823] GPR16: 00000001 00800000 03FCF588 00000000 FFFFFFFF 007FFF00
03FC9FFC 00000002
[   83.441806] GPR24: 03E667C0 C01B0000 C010600C C01B3770 00000012 00000000
00000000 C0193470
[   83.543874] NIP [C001327C] xmon_write+0x38/0xbc
[   83.598032] LR [C001666C] xmon_vfprintf+0x34/0x48
[   83.654272] Call Trace:
[   83.683435] Instruction dump:
[   83.718848] bf61000c 90010024 3d20c01b 8009f1bc 7c9b2378 2f800000
7cbc2b78 40be0008
[   83.811540] 4bfffe2d 3ba00000 3bc00000 48000054 <880b0000> 7c0a4839
4182fff8 7ffbf0ae
[   83.906354] Oops: kernel access of bad area, sig: 11 [#2]
[   83.970893] NIP: C001327C LR: C001666C CTR: 00000000
[   84.030263] REGS: c0192d30 TRAP: 0300   Not tainted  (2.6.20)
[   84.098992] MSR: 00021030 <ME,IR,DR>  CR: 28000048  XER: 00000000
[   84.171898] DAR: 00000005, DSISR: 00000000
[   84.220854] TASK =3D c02a6490[134] 'xsysace' THREAD: c02f8000
[   84.285419] GPR00: 00000001 C0192DE0 C02A6490 00000000 C01B3770 00000012
00000700 00000010
[   84.385403] GPR08: FFFFFFFA 00000020 00000000 00000005 00000000 FFFF87B8
03FD0700 00000000
[   84.485387] GPR16: 00000001 00800000 03FCF588 00000000 FFFFFFFF 007FFF00
03FC9FFC 00000002
[   84.585371] GPR24: 03E667C0 C01B0000 C010600C C01B3770 00000012 00000000
00000000 C0193040
[   84.687439] NIP [C001327C] xmon_write+0x38/0xbc
[   84.741598] LR [C001666C] xmon_vfprintf+0x34/0x48
[   84.797838] Call Trace:
[   84.827000] Instruction dump:
[   84.862412] bf61000c 90010024 3d20c01b 8009f1bc 7c9b2378 2f800000
7cbc2b78 40be0008
[   84.955105] 4bfffe2d 3ba00000 3bc00000 48000054 <880b0000> 7c0a4839
4182fff8 7ffbf0ae
[   85.049913] Oops: kernel access of bad area, sig: 11 [#3]
[   85.114460] NIP: C001327C LR: C001666C CTR: 00000000
[   85.173828] REGS: c0192870 TRAP: 0300   Not tainted  (2.6.20)
[   85.242559] MSR: 00021030 <ME,IR,DR>  CR: 28000048  XER: 00000000
[   85.315463] DAR: 00000005, DSISR: 00000000
[   85.364419] TASK =3D c02a6490[134] 'xsysace' THREAD: c02f8000
[   85.428985] GPR00: 00000001 C0192920 C02A6490 00000000 C01B3770 00000012
00000700 00000010
[   85.528969] GPR08: FFFFFFFA 00000020 00000000 00000005 00000000 FFFF87B8
03FD0700 00000000
[   85.628952] GPR16: 00000001 00800000 03FCF588 00000000 FFFFFFFF 007FFF00
03FC9FFC 00000002
[   85.728936] GPR24: 03E667C0 C01B0000 C010600C C01B3770 00000012 00000000
00000000 C0192B80
[   85.831004] NIP [C001327C] xmon_write+0x38/0xbc
[   85.885163] LR [C001666C] xmon_vfprintf+0x34/0x48
[   85.941404] Call Trace:
[   85.970565] Instruction dump:
[   86.005979] bf61000c 90010024 3d20c01b 8009f1bc 7c9b2378 2f800000
7cbc2b78 40be0008
[   86.098670] 4bfffe2d 3ba00000 3bc00000 48000054 <880b0000> 7c0a4839
4182fff8 7ffbf0ae
[   86.193480] Oops: kernel access of bad area, sig: 11 [#4]
[   86.258024] NIP: C001327C LR: C001666C CTR: 00000000
[   86.317392] REGS: c01923b0 TRAP: 0300   Not tainted  (2.6.20)
[   86.386123] MSR: 00021030 <ME,IR,DR>  CR: 28000048  XER: 00000000
[   86.459028] DAR: 00000005, DSISR: 00000000
[   86.507985] TASK =3D c02a6490[134] 'xsysace' THREAD: c02f8000
[   86.572551] GPR00: 00000001 C0192460 C02A6490 00000000 C01B3770 00000012
00000700 00000010
[   86.672534] GPR08: FFFFFFFA 00000020 00000000 00000005 00000000 FFFF87B8
03FD0700 00000000
[   86.772518] GPR16: 00000001 00800000 03FCF588 00000000 FFFFFFFF 007FFF00
03FC9FFC 00000002
[   86.872502] GPR24: 03E667C0 C01B0000 C010600C C01B3770 00000012 00000000
00000000 C01926C0
[   86.974570] NIP [C001327C] xmon_write+0x38/0xbc
[   87.028727] LR [C001666C] xmon_vfprintf+0x34/0x48
[   87.084967] Call Trace:
[   87.114130] Instruction dump:
[   87.149544] bf61000c 90010024 3d20c01b 8009f1bc 7c9b2378 2f800000
7cbc2b78 40be0008
[   87.242236] 4bfffe2d 3ba00000 3bc00000 48000054 <880b0000> 7c0a4839
4182fff8 7ffbf0ae
[   87.337041] Oops: kernel access of bad area, sig: 11 [#5]
[   87.401589] NIP: C001327C LR: C001666C CTR: 00000000
[   87.460958] REGS: c0191ef0 TRAP: 0300   Not tainted  (2.6.20)
[   87.529687] MSR: 00021030 <ME,IR,DR>  CR: 28000048  XER: 00000000
[   87.602593] DAR: 00000005, DSISR: 00000000
[   87.651549] TASK =3D c02a6490[134] 'xsysace' THREAD: c02f8000
[   87.716115] GPR00: 00000001 C0191FA0 C02A6490 00000000 C01B3770 00000012
00000700 00000010
[   87.816099] GPR08: FFFFFFFA 00000020 00000000 00000005 00000000 FFFF87B8
03FD0700 00000000
[   87.916083] GPR16: 00000001 00800000 03FCF588 00000000 FFFFFFFF 007FFF00
03FC9FFC 00000002
[   88.016067] GPR24: 03E667C0 C01B0000 C010600C C01B3770 00000012 00000000
00000000 C0192200
[   88.118134] NIP [C001327C] xmon_write+0x38/0xbc
[   88.172293] LR [C001666C] xmon_vfprintf+0x34/0x48
[   88.228531] Call Trace:
[   88.257695] Instruction dump:
[   88.293108] bf61000c 90010024 3d20c01b 8009f1bc 7c9b2378 2f800000
7cbc2b78 40be0008
[   88.385801] 4bfffe2d 3ba00000 3bc00000 48000054 <880b0000> 7c0a4839
4182fff8 7ffbf0ae
[   88.480614] Oops: kernel access of bad area, sig: 11 [#6]
[   88.545155] NIP: C001327C LR: C001666C CTR: 00000000
[   88.604522] REGS: c0191a30 TRAP: 0300   Not tainted  (2.6.20)
[   88.673253] MSR: 00021030 <ME,IR,DR>  CR: 28000048  XER: 00000000
[   88.746158] DAR: 00000005, DSISR: 00000000
[   88.795114] TASK =3D c02a6490[134] 'xsysace' THREAD: c02f8000
[   88.859680] GPR00: 00000001 C0191AE0 C02A6490 00000000 C01B3770 00000012
00000700 00000010
[   88.959664] GPR08: FFFFFFFA 00000020 00000000 00000005 00000000 FFFF87B8
03FD0700 00000000
[   89.059648] GPR16: 00000001 00800000 03FCF588 00000000 FFFFFFFF 007FFF00
03FC9FFC 00000002
[   89.159632] GPR24: 03E667C0 C01B0000 C010600C C01B3770 00000012 00000000
00000000 C0191D40
[   89.261699] NIP [C001327C] xmon_write+0x38/0xbc
[   89.315858] LR [C001666C] xmon_vfprintf+0x34/0x48
[   89.372097] Call Trace:
[   89.401261] Instruction dump:
[   89.436673] bf61000c 90010024 3d20c01b 8009f1bc 7c9b2378 2f800000
7cbc2b78 40be0008
[   89.529366] 4bfffe2d 3ba00000 3bc00000 48000054 <880b0000> 7c0a4839
4182fff8 7ffbf0ae
[   89.624178] Oops: kernel access of bad area, sig: 11 [#7]
[   89.688719] NIP: C001327C LR: C001666C CTR: 00000000
[   89.748087] REGS: c0191570 TRAP: 0300   Not tainted  (2.6.20)
[   89.816818] MSR: 00021030 <ME,IR,DR>  CR: 28000048  XER: 00000000
[   89.889724] DAR: 00000005, DSISR: 00000000
[   89.938679] TASK =3D c02a6490[134] 'xsysace' THREAD: c02f8000
[   90.003245] GPR00: 00000001 C0191620 C02A6490 00000000 C01B3770 00000012
00000700 00000010
[   90.103229] GPR08: FFFFFFFA 00000020 00000000 00000005 00000000 FFFF87B8
03FD0700 00000000
[   90.203213] GPR16: 00000001 00800000 03FCF588 00000000 FFFFFFFF 007FFF00
03FC9FFC 00000002
[   90.303197] GPR24: 03E667C0 C01B0000 C010600C C01B3770 00000012 00000000
00000000 C0191880
[   90.405265] NIP [C001327C] xmon_write+0x38/0xbc
[   90.459422] LR [C001666C] xmon_vfprintf+0x34/0x48
[   90.515662] Call Trace:
[   90.544826] Instruction dump:
[   90.580238] bf61000c 90010024 3d20c01b 8009f1bc 7c9b2378 2f800000
7cbc2b78 40be0008
[   90.672930] 4bfffe2d 3ba00000 3bc00000 48000054 <880b0000> 7c0a4839
4182fff8 7ffbf0ae
[   90.767743] Oops: kernel access of bad area, sig: 11 [#8]
[   90.832285] NIP: C001327C LR: C001666C CTR: 00000000
[   90.891654] REGS: c01910b0 TRAP: 0300   Not tainted  (2.6.20)
[   90.960383] MSR: 00021030 <ME,IR,DR>  CR: 28000048  XER: 00000000
[   91.033289] DAR: 00000005, DSISR: 00000000
[   91.082245] TASK =3D c02a6490[134] 'xsysace' THREAD: c02f8000
[   91.146811] GPR00: 00000001 C0191160 C02A6490 00000000 C01B3770 00000012
00000700 00000010
[   91.246795] GPR08: FFFFFFFA 00000020 00000000 00000005 00000000 FFFF87B8
03FD0700 00000000
[   91.346779] GPR16: 00000001 00800000 03FCF588 00000000 FFFFFFFF 007FFF00
03FC9FFC 00000002
[   91.446762] GPR24: 03E667C0 C01B0000 C010600C C01B3770 00000012 00000000
00000000 C01913C0
[   91.548831] NIP [C001327C] xmon_write+0x38/0xbc
[   91.602989] LR [C001666C] xmon_vfprintf+0x34/0x48
[   91.659227] Call Trace:
[   91.688390] Instruction dump:
[   91.723804] bf61000c 90010024 3d20c01b 8009f1bc 7c9b2378 2f800000
7cbc2b78 40be0008
[   91.816495] 4bfffe2d 3ba00000 3bc00000 48000054 <880b0000> 7c0a4839
4182fff8 7ffbf0ae

Qin Lin
--=20
View this message in context: http://www.nabble.com/ML403-AC97-ALSA-Driver-=
problem-tf4351591.html#a12399427
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Hi Qin Lin,

Do you get this overflow everytime you try aplay? Or, do you get it sometimes, only?

What confuses me is, that in your kernel messages the "TASK = ... 'xsysace'" is mentioned. Perhaps there is some relation with the sysace driver? Or do I miss something, here?
Did you try play a .wav file from a RAM disk or NFS-mounted location? I have to note, that I am not using sysace and I haven't tried it jet - especially together with my AC97 driver.

As a first step, no matter what, you could compile your kernel with CONFIG_SND_DEBUG and additionally replace the line

#define PDEBUG_FACILITIES (UNKNOWN | INIT_FAILURE | WORK_FAILURE)

in ml403-ac97cr.c with

#define PDEBUG_FACILITIES (UNKNOWN | INIT_FAILURE | WORK_FAILURE | WORK_INFO | INIT_INFO)

This will give you a, well, huge amount of debugging messages (KERN_DEBUG). There we should see, how far my driver is getting (to some extent).

Joachim

Hi Joachim
Every time aplay wavfile ,there is kernel stack overflow.And the "xsysace" is a CF card driver .
when i just writing data to codec 0 with a simple program ,it is OK, but if i read data from CF card=20
and play ,it overflow also.
Maybe there is something conflict with CF card driver and AC97 driver .

Thanks for your note ,i will test it again.

Qin Lin =20

--=20
View this message in context: http://www.nabble.com/ML403-AC97-ALSA-Driver-=
problem-tf4351591.html#a12470485
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