Re: [PATCH] serial: 8250: 8250_core: Use dev_name() during request_irq()

From: Andy Shevchenko
Date: Sun Mar 12 2017 - 16:05:58 EST


On Wed, Mar 8, 2017 at 2:19 PM, Vignesh R <vigneshr@xxxxxx> 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.
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.

>
> Signed-off-by: Vignesh R <vigneshr@xxxxxx>
> ---
> 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
>



--
With Best Regards,
Andy Shevchenko