Toralf Lund wrote:
Alan Stern wrote:
Yes. I've actually done it on an experimental basis, but I'm quite sure there is no such call in the version I'm testing with now.On Thu, 9 Sep 2004, Toralf Lund wrote:
Something I forgot to mention earlier: I often see evidence of reset signalling at the point where the problems occurs. Could that be something initiated by the host/driver? If it is, how am I supposed to respond?
The USB core will initiate reset signalling when the port-enabled feature
turns off. The most likely causes for that are electromagnetic
interference (EMI) or a bad cable connection. Another possible cause is a defective device that transmits when it shouldn't. A message should show up in the system log whenever this happens.
Also, some drivers may initiate a port reset. But since this is your
driver, presumably you would know if it called usb_reset_device().
In any case, I've now found that while I can always reproduce the read error, I don't see the resets when using the other set of USB ports on my PC; I has an on-board controller and a PCI USB card. - Or at least, I wasn't able to make them appear when testing again after disabling the on-board USB via BIOS setup.
Actually, I was wrong. I still get the resets, and I also have
Sep 13 16:00:42 indonesia kernel: usb.c: USB disconnect on device 00:11.0-2 address 4
or similar in the system log.
*SIGH!* This one is really hard to track down :-(
I'm beginning to suspect that I've had two problems: Bad hardware and some sort of timing issue. I'm thinking maybe the transfer will be interrupted or slowed down by a certain IRQ on the system, but I'm not sure if that would be consistent with the messages...
Alan Stern
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