(pl2303): open("/dev/ttyUSB0", ....) blocks forever after kernel update (custom compilation)

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A simple script like:

echo "1" > /dev/ttyUSB0

stopped to work after upgrading my system to a custom compiled version
of kernel 2.6.35.

There are no errors in syslog or dmesg and the pl2303 loads without
complains, but strace shows that
open("/dev/ttyUSB0",...) blocks forever.

I guess it must be some wrong parameter in the compilation, but I'm
blind trying to find the solution.

Any ideas,

Regards,

Enrique
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