Re: [PATCH 2.6.26] SERIAL DRIVER: Handle Multiple consecutive sysrq from the serial

Andrew Morton wrote:
> On Mon, 15 Sep 2008 19:30:05 +0300
> Eran Liberty <liberty <at> extricom.com> wrote:
>
>   
>> Dear Penguins,
>>
>> Let me start of by saying my particular hardware must be buggy in some 
>> way. When I issue a sysrq (Ctrl A+ F from minicom) I get a lot of sysrq 
>> triggers.
>>
>> I have worked around the problem and I think this workaround is a viable 
>> patch even for platforms which do not exhibit this peculiar behavior.
>>
>> upon getting numerous interrupts which request sysrq the function 
>> uart_handle_break in include/linux/serial_core.h is hit multiple times.
>> The current code which looks like this:
>>
>> static inline int uart_handle_break(struct uart_port *port)
>>  {
>>         struct uart_info *info = port->info;
>>  #ifdef SUPPORT_SYSRQ
>>         if (port->cons && port->cons->index == port->line) {
>>                if (!port->sysrq) {
>>                        port->sysrq = jiffies + HZ*5;
>>                        return 1;
>>                }
>>                port->sysrq = 0;
>>         }
>>  #endif