I applied the patch (or I think so...). I just removed the line: dev->midi_out_substream = NULL; from the function snd_usb_caiaq_midi_output_done in the file caiaq-midi.c. Then I recompiled the driver. The main issue is sorted out: I can start and shut down jackd without big problems. But with dmesg I still have the following message: ALSA /home/marco/build/linux-2.6.24-19-rt/alsa-1.0.17/driver-patched/alsa-driver-1.0.17/acore/rawmidi.c:196: rawmidi drain error (avail = 4095, buffer_size = 4096) Not sure if it is safe to ignore it. Marco 2009/1/7 Takashi Iwai <tiwai@xxxxxxx> > At Sun, 4 Jan 2009 17:29:47 +0100, > Marco Santamaria wrote: > > > > Hi, > > > > it's about one year that I'm using my Native Instruments Audio Kontrol 1 > > (USB2 audio/MIDI interface) only with audio applications and it has been > > working well so far. > > Now I'm trying to use it with Rosegarden (MIDI) and, as soon as I start > > Rosegarden, JACK crashes, the process jackd becomes "uninterruptible" and > > with the command dmesg I find the following new lines > > > > [ 1935.173876] BUG: unable to handle kernel NULL pointer dereference at > > virtual address 00000044 > > [ 1935.173885] printing eip: f8a5f6fd *pde = 00000000 > > [ 1935.173891] Oops: 0000 [#1] PREEMPT SMP > > [ 1935.173896] Modules linked in: isofs udf ipv6 af_packet i915 drm > rfcomm > > l2cap bluetooth ppdev acpi_cpufreq cpufreq_ondemand cpufreq_conservative > > cpufreq_stats freq_table cpufreq_userspace cpufreq_powersave dock > container > > sbs sbshc iptable_filter ip_tables x_tables sbp2 parport_pc lp parport > > snd_hda_intel snd_usb_caiaq snd_hwdep snd_pcm_oss snd_mixer_oss arc4 > > snd_seq_oss snd_pcm ecb blkcipher snd_seq_midi snd_page_alloc joydev > > snd_rawmidi snd_seq_midi_event snd_seq iwl3945 sdhci serio_raw mmc_core > > iwlwifi_mac80211 video output cfg80211 battery led_class ac snd_timer > > snd_seq_device wmi_acer button snd evdev dcdbas iTCO_wdt > iTCO_vendor_support > > intel_agp shpchp pci_hotplug pcspkr soundcore agpgart psmouse ext3 jbd > > mbcache sg sr_mod cdrom sd_mod b44 ata_generic ssb mii ohci1394 ieee1394 > > ata_piix pata_acpi libata scsi_mod ehci_hcd uhci_hcd usbcore thermal > > processor fan fuse > > [ 1935.173964] > > [ 1935.173967] Pid: 1421, comm: IRQ-18 Not tainted (2.6.24-19-rt #1) > > [ 1935.173970] EIP: 0060:[<f8a5f6fd>] EFLAGS: 00010292 CPU: 1 > > [ 1935.173979] EIP is at snd_rawmidi_transmit_peek+0x1d/0x100 > [snd_rawmidi] > > [ 1935.173982] EAX: 00000000 EBX: f7106264 ECX: 0000003d EDX: f7106407 > > [ 1935.173985] ESI: ffffffea EDI: 00000000 EBP: f7106407 ESP: df85be38 > > [ 1935.173988] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > > preempt:00000001 > > [ 1935.173991] Process IRQ-18 (pid: 1421, ti=df85a000 task=f7d45320 > > task.ti=df85a000) > > [ 1935.173993] Stack: 0000003d 00000000 f7106264 00000000 00000000 > df83fc00 > > f8b8cc09 00000000 > > [ 1935.174000] f7106264 f710630c 00000000 df83fc00 df83fc00 > f710630c > > f888c888 00000008 > > [ 1935.174007] df83fd08 00000000 f710630c f8870770 f728a0c0 > f728a0c0 > > ffffff8d f721e180 > > [ 1935.174014] Call Trace: > > [ 1935.174021] [<f8b8cc09>] snd_usb_caiaq_midi_send+0x29/0x80 > > [snd_usb_caiaq] > > [ 1935.174034] [<f888c888>] usb_hcd_giveback_urb+0x48/0xc0 [usbcore] > > [ 1935.174064] [<f8870770>] ehci_urb_done+0x70/0xb0 [ehci_hcd] > > [ 1935.174075] [<f887153f>] qh_completions+0x24f/0x430 [ehci_hcd] > > [ 1935.174087] [<f8870770>] ehci_urb_done+0x70/0xb0 [ehci_hcd] > > [ 1935.174096] [<f887293e>] ehci_work+0x51e/0x810 [ehci_hcd] > > [ 1935.174103] [<c010b1e3>] sched_clock+0x13/0x40 > > [ 1935.174116] [<c0129199>] dequeue_task_rt+0xb9/0x1c0 > > [ 1935.174129] [<f8875498>] ehci_irq+0x158/0x1c0 [ehci_hcd] > > [ 1935.174142] [<f888cb7b>] usb_hcd_irq+0x2b/0x60 [usbcore] > > [ 1935.174166] [<c016a9cc>] handle_IRQ_event+0x5c/0x100 > > [ 1935.174178] [<c016b00a>] thread_simple_irq+0x4a/0x90 > > [ 1935.174185] [<c016b959>] do_irqd+0x229/0x290 > > [ 1935.174194] [<c016b730>] do_irqd+0x0/0x290 > > [ 1935.174199] [<c0141fc2>] kthread+0x42/0x70 > > [ 1935.174203] [<c0141f80>] kthread+0x0/0x70 > > [ 1935.174209] [<c0105857>] kernel_thread_helper+0x7/0x10 > > [ 1935.174217] ======================= > > [ 1935.174219] Code: 24 10 83 c4 14 c3 bf ea ff ff ff eb e3 90 83 ec 18 > 89 > > 74 24 0c be ea ff ff ff 89 6c 24 14 89 d5 89 5c 24 08 89 7c 24 10 89 0c > 24 > > <8b> 58 44 8b 7b 04 85 ff 0f 84 8e 00 00 00 8d 43 20 31 f6 89 44 > > [ 1935.174256] EIP: [<f8a5f6fd>] snd_rawmidi_transmit_peek+0x1d/0x100 > > [snd_rawmidi] SS:ESP 0068:df85be38 > > [ 1935.174265] ---[ end trace 9090d02b798b5496 ]--- > > > > I already asked to the Rosegarden and JACK people, but they couldn't help > > me: it seems to be a driver related problem, as I can happily use > > Rosegarden if I run JACK with the internal Intel sound card. > > How about the patch below? > > > thanks, > > Takashi > > --- > diff --git a/sound/usb/caiaq/caiaq-midi.c b/sound/usb/caiaq/caiaq-midi.c > index 30b57f9..89a29f0 100644 > --- a/sound/usb/caiaq/caiaq-midi.c > +++ b/sound/usb/caiaq/caiaq-midi.c > @@ -170,7 +170,6 @@ void snd_usb_caiaq_midi_output_done(struct urb* urb) > return; > > snd_rawmidi_transmit_ack(dev->midi_out_substream, buf[2]); > - dev->midi_out_substream = NULL; > snd_usb_caiaq_midi_send(dev, dev->midi_out_substream); > } > > _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
