2.6.9-rc3 changes the locking in the tty_ioctl.c function change_termios(). It gets a spin_lock_irqsave(&tty_termios_lock,...) before calling the tty driver's set_termios function.
This means that the drivers' set_termios functions cannot sleep.
Unfortunately, many USB serial drivers' set_termios functions send an urb to change the termios settings and sleep waiting for it to complete.
I just looked quickly, but it seems belkin_sa.c, digi_acceleport.c, ftdi_sio.c, io_ti.c, kl5usb105.c, mct_u232.c, pl2303.c, and whiteheat.c all sleep in their set_termios functions.
If this locking in change_termios() stays, we are going to have to fix set_termios in all of these drivers. I am updating io_ti.c right now.
-- Al
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