Problem of PowerPc 82xx when using smc

[hellohello]

I find a problem in 
drivers/serial/cpm_uart/cpm_uart_cpm2.c:
int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
{
... ...
pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
/*The above line should be ：*/
 pinfo->tx_bd_base = pinfo->rx_bd_base + sizeof(cbd_t) * pinfo->rx_nrfifos;
 
return 0;
}

Where to get the newest code for kernel?
How to know whether it is already patched by anyone else?  Just search in  this mail list?

My Linux Kernel is 2.6.25, platform is mpc82XX.

Thanks for any help.
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