Hello,
I develop linux drivers for an embedded system with USB devices. The
USB drivers in question have been stable for a while, at least since
linux 2.6.26.n. We have to move the system to the newest 2.6 kernel
(2.6.39.4) that has support for video hardware. When I built the
embedded system's USB drivers for the 2.6.39.4 kernel, I keep getting
the error message "Resource Temporarily Unavailable" when attempting
to 'cat' the device file. No error message appear in the syslog. My
USB driver uses the same kind of calls as usb-skeleton.c to create the
device file via usb_register() in the init function and
usb_register_dev() in the probe callback. The device is create with a
dynamic minor number in its name in /dev as expected. But every use of
this file comes back with the error. My debug printk indicate my open
function is not ever being called.
I checked the difference between usb-skeleton.c files and there has
only been an addition of adding a llseek entry in the file operations
structure. I modified my driver and it didn't make a difference - long
shot.
I tested kernels 2.6.39.4, 2.6.38.8, 2.6.37.7, 2.6.37.1, 2.6.36.4. It
works in kernels before and including 2.6.36.4. It stops working for
all kernels tested beyond and including 2.6.37.1.
I have another class of driver not using the usb api to create device
files. None of those exhibit this problem. That is why I am posting
this in this linux-usb forum.
Thanks in advance,
Donald Kayser
linux at kayser dot net
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