linux-kernel - Re: [PATCH] serial: 8250: 8250_core: Use dev_name() during request

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Date:   Tue, 14 Mar 2017 19:14:19 +0530
From:   Vignesh R <vigneshr@...com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] serial: 8250: 8250_core: Use dev_name() during
 request_irq()



On Monday 13 March 2017 01:35 AM, Andy Shevchenko wrote:
> On Wed, Mar 8, 2017 at 2:19 PM, Vignesh R <vigneshr@...com> wrote:
>> Passing "serial" as name during request_irq() results in all serial port
>> irqs have same name. This does not help much to easily identify which
>> irq belongs to which serial port instance. Therefore pass dev_name()
>> during request_irq() so that better identifiable name is listed for
>> serial ports in cat /proc/interrupts output.
>>
>> Output of cat /proc/interrupts
>> Before this patch:
>>  26:        689          0     GICv2 309 Edge      serial
>> After this patch:
>>  26:        696          0     GICv2 309 Edge      2530c00.serial
> 
> I don't know if it worth to mention that some (testing) tools may
> depend on this name.

I wonder how such tools will distinguish b/w different serial device
instances. But, this change is making interrupt name more descriptive
and maybe help test tools to distinguish irqs more easily

> Besides that imagine what would be the name of PCI device here. 
> I would suggest adding ID if you need one in a form like
> "serial%d", where ID may or may not be supplied by the actual 8250 drivers.
> 

Are you suggesting to use serial_index() as ID?

>>
>> Signed-off-by: Vignesh R <vigneshr@...com>
>> ---
>>  drivers/tty/serial/8250/8250_core.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
>> index 76e03a7de9cc..f83b69f30987 100644
>> --- a/drivers/tty/serial/8250/8250_core.c
>> +++ b/drivers/tty/serial/8250/8250_core.c
>> @@ -218,7 +218,7 @@ static int serial_link_irq_chain(struct uart_8250_port *up)
>>                 spin_unlock_irq(&i->lock);
>>                 irq_flags |= up->port.irqflags;
>>                 ret = request_irq(up->port.irq, serial8250_interrupt,
>> -                                 irq_flags, "serial", i);
>> +                                 irq_flags, dev_name(up->port.dev), i);
>>                 if (ret < 0)
>>                         serial_do_unlink(i, up);
>>         }
>> --
>> 2.11.0
>>
> 
> 
> 

-- 
Regards
Vignesh