Takashi Iwai wrote On 07-08-2009 12:56:> At Fri, 7 Aug 2009 10:43:07 +0100,> James Courtier-Dutton wrote:> >> 2009/8/7 Ozan Çağlayan <ozan@xxxxxxxxxxxxx>:>> >>> Added the following lines:>>>>>> printk(KERN_INFO "0x%p\n", jack);>>> printk(KERN_INFO "0x%p\n", jack->jack);>>> printk(KERN_INFO "0x%p\n", jack->jack->private_data);>>>>>> dmesg:>>>>>> NVRM: loading NVIDIA UNIX x86 Kernel Module 180.51 Thu Apr 16 19:02:15>>> PDT 2009>>> ACPI: PCI Interrupt 0000:00:1b.0[A] -> GSI 22 (level, low) -> IRQ 22>>> PCI: Setting latency timer of device 0000:00:1b.0 to 64>>> 0xf777a614>>> 0x00000000>>> BUG: unable to handle kernel NULL pointer dereference at 00000074>>> IP: [<f93f2d97>] :snd_hda_codec_conexant:conexant_add_jack+0x57/0x81>>> *pde = 00000000·>>> Oops: 0000 [#1] SMP>>>>>> >> Need more of the dmesg output.>> I.e. to see which print statements succeeded.>> Alternatively, attach the snd_hda.ko so one can see where in that file>> offset 0x57 is.>> But a more useful print would be:>> if (!jack) printk(KERN_INFO "jack null\n");>> else if (!(jack->jack)) printk(KERN_INFO "jack->jack null\n");>> else if (!(jack->jack->private_data)) printk(KERN_INFO>> "jack->jack->private_data null\n");>> >> Well, it's fairly obvious that jack->jack is NULL as the second> output is NULL, and the third one hits Oops.>> Ozan, could you check whether CONFIG_SND_JACK is set in> stac92xx_add_jack, e.g. like below?>> Nope it seems that it's not set as the #error pragma is executed. Ilooked into the configure script and found the following: if alsa_check_kconfig_option "hda-input-jack"; then if ( test "$CONFIG_SND_PCI" = "y" -o "$CONFIG_SND_PCI" = "m" ) && ( test "$CONFIG_SND_HDA_INTEL" = "y" -o "$CONFIG_SND_HDA_INTEL" ="m" ) && ( test "$CONFIG_INPUT" = "y" -o "$CONFIG_INPUT" = "m" ); then test "$kversion.$kpatchlevel" = "2.6" -a $ksublevel -ge 27 &&CONFIG_SND_JACK="y" CONFIG_SND_HDA_INPUT_JACK="y" fi SND_JACK is set if sublevel >= 27 but SND_HDA_INPUT_JACK is setregardless of anything. Why the lower limit is 27 for that functionality? _______________________________________________Alsa-devel mailing listAlsa-devel@xxxxxxxxxxxxxxxxxxxx://mailman.alsa-project.org/mailman/listinfo/alsa-devel
