Hello,
I have a problem with the cdc-acm driver on Linux 2.6.31.
As soon as I open /dev/ttyACM0, my system freezes completely.
This never occurred with Linux 2.6.30.4.
I diffed those versions of cdc-acm.c, then modified the 2.6.31
version to comment out a suspicious looking line:
rv = tty_port_block_til_ready(&acm->port, tty, filp);
With this line commented out, I can open /dev/ttyACM0 and it appears
to work correctly.
So something bad happens inside tty_port_block_til_ready().
I will try to dig a bit deeper.
Greetings, Joris.
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