On Wed, Jan 13, 2010 at 19:14:45, Alan Cox wrote:
> > +static int serial8250_cpufreq_transition(struct notifier_block *nb,
> > + unsigned long val, void *data)
> > +{
> > + struct uart_8250_port *p;
> > + struct uart_port *uport;
> > +
> > + p = container_of(nb, struct uart_8250_port, freq_transition);
> > + uport = &p->port;
> > +
> > + if (IS_ERR(p->clk))
> > + goto cpu_freq_exit;
> > +
> > + if (p->port.uartclk == clk_get_rate(p->clk))
> > + goto cpu_freq_exit;
> > +
> > + p->port.uartclk = clk_get_rate(p->clk);
> > + if (val == CPUFREQ_POSTCHANGE) {
> > + struct ktermios *termios;
> > + struct tty_struct *tty;
> > + if (uport->state == NULL)
> > + goto cpu_freq_exit;
> > +
> > + tty = uport->state->port.tty;
>
> Need locking on port->tty.
>
> > + if (tty == NULL)
> > + goto cpu_freq_exit;
> > +
>
> Need locking on tty->termios
>
> I'd say this is also probably at the wrong level - why not do it at the
> uart_port level instead (ie move the code you have into serial_core using
> uart_port) - you've made it all nicely generic already.
>
> Alan
>
Thank you for the review comments.
I will submit an updated version of patch soon.
Regards,
Chaithrika
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