linux-kernel - Re: [PATCH] serial: 8250_mid: Use pci_irq

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Date:   Tue, 17 Aug 2021 14:59:13 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Utkarsh Verma <utkarshverma294@...il.com>
Cc:     Jiri Slaby <jirislaby@...nel.org>, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH] serial: 8250_mid: Use pci_irq_vector() to get IRQ

On Tue, Aug 17, 2021 at 01:44:01PM +0530, Utkarsh Verma wrote:
> Instead of a direct assignment, use pci_irq_vector() to get the
> Linux IRQ number.

Why is this needed?

> Signed-off-by: Utkarsh Verma <utkarshverma294@...il.com>
> ---
>  drivers/tty/serial/8250/8250_mid.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/8250/8250_mid.c b/drivers/tty/serial/8250/8250_mid.c
> index efa0515139f8..3a279ce0e904 100644
> --- a/drivers/tty/serial/8250/8250_mid.c
> +++ b/drivers/tty/serial/8250/8250_mid.c
> @@ -299,7 +299,7 @@ static int mid8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  	memset(&uart, 0, sizeof(struct uart_8250_port));
>  
>  	uart.port.dev = &pdev->dev;
> -	uart.port.irq = pdev->irq;
> +	uart.port.irq = pci_irq_vector(pdev, 0);

What problem does this solve?

Do not describe what you are doing, but rather, _why_ you are doing it.

thanks,

greg k-h