linux-kernel - Re: [PATCH] serial: 8250: 8250_core: Fix irq name for 8250 serial irq

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Message-ID: <6515939.2USCG1AhyO@wuerfel>
Date:   Thu, 16 Mar 2017 22:46:06 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Vignesh R <vigneshr@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jisheng Zhang <jszhang@...vell.com>,
        linux-kernel@...r.kernel.org,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-serial@...r.kernel.org, Jiri Slaby <jslaby@...e.com>
Subject: Re: [PATCH] serial: 8250: 8250_core: Fix irq name for 8250 serial irq

On Thursday, March 16, 2017 5:56:53 PM CET Vignesh R wrote:
> Using dev_name() as irq name during request_irq() might be misleading in
> case of serial over PCI. Therefore use a better alternative name for
> identifying serial port irqs as "serial" appended with serial_index of
> the port. This ensures that "serial" string is always present in irq
> name while port index will help in distinguishing b/w different ports.
> 
> Signed-off-by: Vignesh R <vigneshr@...com>
> ---
> 
> Based on top of tty-next.
> 
>  drivers/tty/serial/8250/8250_core.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
> index f83b69f30987..78bf621d6827 100644
> --- a/drivers/tty/serial/8250/8250_core.c
> +++ b/drivers/tty/serial/8250/8250_core.c
> @@ -213,12 +213,20 @@ static int serial_link_irq_chain(struct uart_8250_port *up)
>  
>  		ret = 0;
>  	} else {
> +		char *irqname = kmalloc(20, GFP_KERNEL);
> +		if (!irqname) {
> +			spin_unlock_irq(&i->lock);
> +			return -ENOMEM;
> +		}
> +		snprintf(irqname, 20,
> +			 "serial%d", serial_index(&up->port));

kasprintf()?

Also, you need to free the memory after free_irq().

	Arnd