pppd and 2.6.25 serial driver

[Chris Vine]

Because I have had to resort to using dial-up this weekend, I noticed
that the serial driver for the 8250/16550 UART in the 2.6.25 kernel does
not work correctly with ppp-2.4.4. After establishing a dial-up modem
connection it becomes unresponsive and pppd will exit waiting to
establish a ppp connection after sending LCP configuration requests.  I
have tested this with two different dial-up modems and at two different
dial-up providers, with the 2.6.25.3 and 2.6.25.4 kernels.

pppd works fine with the 2.6.25 kernel if the serial driver is not used
(for example if establishing a ppp connection over (in kernel) ATM or
via an (out of kernel tree) softmodem driver I have.

The serial driver in 2.6.24.7 works correctly, and the good news is
that 2.6.26-rc2 also works fine.

Chris

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