I've been trying to fix some problems I'm getting with the USB audio driver.
Basically, I get these types of messages over and over accompanied by some audio glitches: ALSA usbaudio.c:688: cannot submit datapipe for urb 0, err = -6 usb-uhci.c: ENXIO 00038200, flags 2, urb cf74f5c0, burb cf74f5c0
I've been able to reproduce this problem on quite a few different systems, including different architectures. The problems seem to occur much more often on slower machines than on faster machines. Basically, I've been able to identify that this is due to the Linux USB layer checking whether the urb->hcpriv field being NULL in the *_submit_urb() code and returning -EINVAL if it's not. In other words, the URBs used by the USB audio driver are reused prior to being cosumed.
I've instrumented the usbaudio driver using the Linux Trace Toolkit to get some info about the behavior of start_urbs() and snd_complete_urb(). I've also added a trace point at the same place where the printk for "cannot submit datapipe for ubr" is called. Here's what I get (note where "Abusing URB" is happening):
Event creation 4,867,640,107 N/A 391 NEW EVENT TYPE : Start URB; CUSTOM EVENT ID : 24 Event creation 4,867,640,138 N/A 391 NEW EVENT TYPE : Complete URB; CUSTOM EVENT ID : 25 Event creation 4,867,640,260 N/A 391 NEW EVENT TYPE : Abuse URB; CUSTOM EVENT ID : 26 Start URB 4,869,110,362 90 33 Sending URB 0 Start URB 4,869,110,606 90 33 Sending URB 1 Start URB 4,869,110,728 90 33 Sending URB 2 Start URB 4,869,110,850 90 33 Sending URB 3 Start URB 4,869,110,972 90 33 Sending URB 4 Complete URB 4,869,124,063 0 36 Completing URB 0 Complete URB 4,869,128,000 0 36 Completing URB 1 Complete URB 4,869,132,058 0 36 Completing URB 2 Complete URB 4,869,135,995 0 36 Completing URB 3 Complete URB 4,869,140,023 0 36 Completing URB 4 Complete URB 4,869,144,051 0 36 Completing URB 0 Complete URB 4,869,147,987 0 36 Completing URB 1 Complete URB 4,869,152,015 0 36 Completing URB 2 Complete URB 4,869,156,043 0 36 Completing URB 3 Complete URB 4,869,160,010 0 36 Completing URB 4 Complete URB 4,869,164,038 0 36 Completing URB 0 Complete URB 4,869,168,066 0 36 Completing URB 1 Complete URB 4,869,172,003 0 36 Completing URB 2 Complete URB 4,869,176,031 0 36 Completing URB 3 Complete URB 4,869,180,059 0 36 Completing URB 4 Complete URB 4,869,183,995 0 36 Completing URB 0 Complete URB 4,869,188,054 0 36 Completing URB 1 Complete URB 4,869,192,021 0 36 Completing URB 2 Complete URB 4,869,196,018 0 36 Completing URB 3 Complete URB 4,869,200,046 0 36 Completing URB 4 Complete URB 4,869,204,013 0 36 Completing URB 0 Complete URB 4,869,208,011 0 36 Completing URB 1 Complete URB 4,869,212,039 0 36 Completing URB 2 Complete URB 4,869,216,006 0 36 Completing URB 3 Complete URB 4,869,220,003 0 36 Completing URB 4 Complete URB 4,869,224,001 0 36 Completing URB 0 Complete URB 4,869,227,998 0 36 Completing URB 1 Complete URB 4,869,231,996 0 36 Completing URB 2 Complete URB 4,869,235,993 0 36 Completing URB 3 Complete URB 4,869,240,021 0 36 Completing URB 4 Complete URB 4,869,244,019 0 36 Completing URB 0 .... Complete URB 4,870,112,025 0 36 Completing URB 3 Complete URB 4,870,116,022 0 36 Completing URB 4 Complete URB 4,870,120,020 0 36 Completing URB 0 Complete URB 4,870,124,017 0 36 Completing URB 1 Complete URB 4,870,128,015 0 36 Completing URB 2 Complete URB 4,870,132,043 0 36 Completing URB 3 Complete URB 4,870,136,040 0 36 Completing URB 4 Complete URB 4,870,140,038 0 36 Completing URB 0 Complete URB 4,870,144,035 0 36 Completing URB 1 Start URB 4,870,145,378 90 33 Sending URB 0 Start URB 4,870,145,531 90 33 Sending URB 1 Start URB 4,870,145,653 90 33 Sending URB 2 Start URB 4,870,145,744 90 33 Sending URB 3 Start URB 4,870,145,866 90 33 Sending URB 4 Complete URB 4,870,148,063 0 36 Completing URB 2 Complete URB 4,870,152,061 0 36 Completing URB 3 Complete URB 4,870,156,058 0 36 Completing URB 4 Complete URB 4,870,159,049 0 36 Completing URB 0 Complete URB 4,870,160,056 0 36 Completing URB 0 Complete URB 4,870,163,046 0 36 Completing URB 1 Complete URB 4,870,164,053 0 36 Completing URB 1 Complete URB 4,870,167,044 0 36 Completing URB 2 Complete URB 4,870,168,020 0 36 Completing URB 2 Complete URB 4,870,171,041 0 36 Completing URB 3 ... Complete URB 4,871,171,087 0 36 Completing URB 3 Complete URB 4,871,172,063 0 36 Completing URB 0 Complete URB 4,871,175,054 0 36 Completing URB 4 Complete URB 4,871,176,061 0 36 Completing URB 1 Complete URB 4,871,179,051 0 36 Completing URB 0 Complete URB 4,871,180,089 0 36 Completing URB 2 Complete URB 4,871,180,364 0 36 Completing URB 0 Complete URB 4,871,181,127 0 36 Completing URB 1 Complete URB 4,871,182,103 0 36 Completing URB 3 Complete URB 4,871,183,079 0 36 Completing URB 1 Complete URB 4,871,183,202 0 36 Completing URB 4 Start URB 4,871,184,300 90 33 Sending URB 0 Start URB 4,871,184,483 90 33 Sending URB 1 Start URB 4,871,184,605 90 33 Sending URB 2 Start URB 4,871,184,697 90 33 Sending URB 3 Start URB 4,871,184,819 90 33 Sending URB 4 Start URB 4,871,186,833 90 33 Sending URB 0 Start URB 4,871,186,985 90 33 Sending URB 1 Start URB 4,871,187,138 90 33 Sending URB 2 Abuse URB 4,871,187,169 90 33 Abusing URB 2 Complete URB 4,871,204,410 90 36 Completing URB 2 Complete URB 4,871,205,173 0 36 Completing URB 3 Complete URB 4,871,205,295 0 36 Completing URB 4 Complete URB 4,871,205,447 0 36 Completing URB 0 Complete URB 4,871,205,722 0 36 Completing URB 0 Complete URB 4,871,205,935 0 36 Completing URB 1 Complete URB 4,871,206,180 0 36 Completing URB 1 Complete URB 4,871,207,095 90 36 Completing URB 2 Start URB 4,871,207,736 90 33 Sending URB 0 Start URB 4,871,207,858 90 33 Sending URB 1 Start URB 4,871,207,949 90 33 Sending URB 2 Start URB 4,871,208,071 90 33 Sending URB 3 Start URB 4,871,208,194 90 33 Sending URB 4 Complete URB 4,871,210,116 0 36 Completing URB 3 Complete URB 4,871,214,083 0 36 Completing URB 4 Complete URB 4,871,218,111 0 36 Completing URB 0 Complete URB 4,871,221,071 0 36 Completing URB 0 Complete URB 4,871,222,078 0 36 Completing URB 1 Complete URB 4,871,225,068 0 36 Completing URB 1 Complete URB 4,871,226,075 0 36 Completing URB 2 Complete URB 4,871,229,066 0 36 Completing URB 2 Complete URB 4,871,230,073 0 36 Completing URB 3 Complete URB 4,871,233,063 0 36 Completing URB 3 Complete URB 4,871,234,070 0 36 Completing URB 4 Complete URB 4,871,237,061 0 36 Completing URB 4 Complete URB 4,871,238,068 0 36 Completing URB 0 Complete URB 4,871,241,058 0 36 Completing URB 0 ... Complete URB 4,871,716,089 0 36 Completing URB 0 Complete URB 4,871,717,096 0 36 Completing URB 4 Complete URB 4,871,720,087 0 36 Completing URB 1 Complete URB 4,871,721,094 0 36 Completing URB 0 Complete URB 4,871,724,084 0 36 Completing URB 2 Complete URB 4,871,725,091 0 36 Completing URB 1 Complete URB 4,871,728,082 0 36 Completing URB 3 Complete URB 4,871,729,089 0 36 Completing URB 2 Complete URB 4,871,730,187 0 36 Completing URB 2 Start URB 4,871,731,377 90 33 Sending URB 0 Abuse URB 4,871,731,408 90 33 Abusing URB 0 Complete URB 4,871,748,741 90 36 Completing URB 4 Start URB 4,871,749,015 90 33 Sending URB 0 Abuse URB 4,871,749,046 90 33 Abusing URB 0 Complete URB 4,871,766,439 90 36 Completing URB 3 Complete URB 4,871,766,561 90 36 Completing URB 0 Complete URB 4,871,766,684 90 36 Completing URB 4 Complete URB 4,871,766,806 90 36 Completing URB 1 Complete URB 4,871,766,928 90 36 Completing URB 0 Complete URB 4,871,767,019 90 36 Completing URB 1 Complete URB 4,871,767,141 90 36 Completing URB 3 Start URB 4,871,767,294 90 33 Sending URB 0 Start URB 4,871,767,538 90 33 Sending URB 1 Start URB 4,871,767,629 90 33 Sending URB 2 Start URB 4,871,767,752 90 33 Sending URB 3 Start URB 4,871,767,843 90 33 Sending URB 4 Start URB 4,871,769,766 90 33 Sending URB 0 Start URB 4,871,769,918 90 33 Sending URB 1 Start URB 4,871,770,040 90 33 Sending URB 2 Start URB 4,871,770,162 90 33 Sending URB 3 Start URB 4,871,770,254 90 33 Sending URB 4 Complete URB 4,871,772,176 0 36 Completing URB 1 Complete URB 4,871,773,122 0 36 Completing URB 2 Complete URB 4,871,774,099 0 36 Completing URB 3 Complete URB 4,871,775,106 0 36 Completing URB 4 Start URB 4,871,775,899 90 33 Sending URB 0 Abuse URB 4,871,775,960 90 33 Abusing URB 0 Start URB 4,871,793,323 90 33 Sending URB 0 Abuse URB 4,871,793,384 90 33 Abusing URB 0 Complete URB 4,871,810,800 90 36 Completing URB 0 Complete URB 4,871,811,257 90 36 Completing URB 0 Complete URB 4,871,811,379 90 36 Completing URB 1 Complete URB 4,871,811,654 90 36 Completing URB 2 Complete URB 4,871,811,898 90 36 Completing URB 3 Complete URB 4,871,813,128 90 36 Completing URB 4 Start URB 4,871,819,109 90 33 Sending URB 0 Start URB 4,871,819,292 90 33 Sending URB 1 Start URB 4,871,819,414 90 33 Sending URB 2 Start URB 4,871,819,505 90 33 Sending URB 3 Start URB 4,871,819,627 90 33 Sending URB 4 Complete URB 4,871,824,113 0 36 Completing URB 0 Complete URB 4,871,828,080 0 36 Completing URB 1 Complete URB 4,871,832,078 0 36 Completing URB 2 Complete URB 4,871,833,085 0 36 Completing URB 0 Complete URB 4,871,836,075 0 36 Completing URB 3 Complete URB 4,871,837,082 0 36 Completing URB 1 Complete URB 4,871,840,073 0 36 Completing URB 4 Complete URB 4,871,841,080 0 36 Completing URB 2 Complete URB 4,871,844,070 0 36 Completing URB 0 ...
[All the parts with "..." are events where there's only "Complete URB" which happens.]
I'm using ALSA 0.9.6, but the problems do occur on later versiosns still. This particular trace was collected on an ARM board.
Does anyone have any hints as to what I should be looking at.
Karim -- Author, Speaker, Developer, Consultant Pushing Embedded and Real-Time Linux Systems Beyond the Limits http://www.opersys.com || [EMAIL PROTECTED] || 514-812-4145
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