TTY: poll_wait (kernel 2.2.15)

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Hello,

Would someone please tell me what is this tty->poll_wait for?? It breaks
driver backward compatibility in the 2.2.x kernel series (i.e. the driver
that compiles in 2.2.15 does not compile in previous 2.2.x kernels), so I
hope this new tty_struct field stands for something important.

In time: it's not present in 2.3.99-pre6 (why not, assuming it's
important?).

Regards,
Ivan

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