Configuration:
Distribution:Linux Fedora Core 2
Kernel:2.6.7
Problem occured also with the RedHat 7.3 distribution (kernel 2.4.18)
HCD:uhci_hcd
Hi,
I'm writing an USB driver for a specific device.
If I terminate an IO (a read on a BULK or an interrupt pipe) by calling
usb_unlink_urb()
then I submit another URB, I miss some data. With an USB analyser, I can
see a packet that is missed.
The driver IO completion call-back will never be called until the device
send other data.
Any Idea ?
In my driver I don't use the usb_bulk_msg() function because I implement
some specific features.
I had a look to the usb_bulk_msg() source code to check the way that the
timeout is managed. I noticed that when
the timeout is elapsed, usb_unlink_urb() is used to terminate the IO
request.
So, when usb_bulk_msg() terminates in timeout, the above probleme occured
(I have tested).
The problem occured by reading a BULK or an interupt pipe. So try with a
mouse it's easy to reproduce.
Is it a bug or did I misunderstand something in the USB API ?
I'm looking for my OHCI controller. I didn't find yet but, if need it, I
will be able to make some tests on an OHCI controller.
Thanks in advance for your help.
Regards.
Thierry
--------------------------------------------------------------------------------------------------------------
Thierry Chantry
LotSys
5-7, rue Salomon de Rothshild
92156 Suresnes
Tel: +(33) 1 41 44 39 55 Fax: +(33) 1 41 44 39 39
--------------------------------------------------------------------------------------------------------------
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