Hi Alan,
On Wed, Jul 29, 2009 at 6:11 PM, Alan Stern<stern@xxxxxxxxxxxxxxxxxxx> wrote:
>> The "async" debug file is empty in all cases: after detection of the device,
>> after closing minicom, even after disconnecting it from the bus; removing
>> ehci-hcd still produces the dma pool busy messages.
>
> I think I figured out the problem. The patch below (which includes the
> previous patch) should fix it. Let me know how it works.
Yes, the patch works fine! I've inserted/removed ehci-hcd and opened/closed
ttyACM0 withouth a hitch ~100 times now.
If it matters:
Tested-by: Manuel Lauss <manuel.lauss@xxxxxxxxx>
> If it doesn't, can you provide both the dmesg log and a usbmon log
> (with the new patch) showing what happens when you reload ehci-hcd and
> the CDC-ACM device is detected but fails to work?
This isn't HCD related, but seems to be a bug in the ACM devices' firmware:
If it gets disconnected from USB it will happy re-enumerate but not send
any data until it gets resetted externally.
Thank you Alan!
Manuel Lauss
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