At Sat, 12 Jul 2003 23:45:08 -0500 (CDT), Stephane Alnet wrote: > > I hit two different problems; the first one has already been mentioned on > the list a couple days ago and shows up as: > > ALSA sound/usb/usbaudio.c:685: cannot submit datapipe for urb 0, err = -22 > (-22 is -EINVAL) > > After some parsing of usb_submit_urb, I added some debugs in usbaudio.c > and found out that urb->interval was set to 0, an invalid value. So I > forced it to 1 and things started to work. (Obviously the proper fix may > be to find why it's not properly initialized in the first place.) yeah, that's a known problem of usb-audio driver on the recent 2.5/2.6 kernel...
> However I still had the "bad: scheduling while atomic!" problem I reported > earlier on the list; sometimes I'd also get "Debug: sleeping function > called from illegal context at kernel/sched.c:1489". these errors should have been fixed on 0.9.5. usb_submit_urb() was called in prepare callback of ALSA, which is supposed to be atomic. > Looking at the output > from my debugs I saw that in some cases we were calling usb_submit_urb > with a non-NULL urb->hcpriv, which isn't valid either. hmm, this looks bad. > So, I'm not sure what the root cause for this last problem is (besides the > fact that schedule() is called within schedule()), but I kind of worked > around it by guarding all the usb_submit_urb calls with a check for a NULL > urb->hcpriv. I still get the same oopses when opening the device, and > sound quality gets down under load (lost packets), but otherwise things > seem to be working much better. > > Attached are the diffs I made; it's getting late here so I'll check back > on it tomorrow, but hopefully that'll give somebody some ideas of what I > did. :-] thanks for the patch. i was working on this yesterday, 2.6.0-test1 was succesfully built, and... this morning i found my harddisk crashed completely :-< too bad. i still have only a 2.4 environment, so fixing this problem might take a bit longer time. please be patient. Takashi ------------------------------------------------------- This SF.net email is sponsored by: VM Ware With VMware you can run multiple operating systems on a single machine. WITHOUT REBOOTING! Mix Linux / Windows / Novell virtual machines at the same time. Free trial click here: http://www.vmware.com/wl/offer/345/0 _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
