linux-kernel - Re: [PATCH v1 1/4] serial: 8250_pci: Refactor the loop in pci_ite887x

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Date:   Wed, 14 Jul 2021 03:44:31 -0700
From:   Joe Perches <joe@...ches.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>
Subject: Re: [PATCH v1 1/4] serial: 8250_pci: Refactor the loop in
 pci_ite887x_init()

On Tue, 2021-07-13 at 13:40 +0300, Andy Shevchenko wrote:
> The loop can be refactored by using ARRAY_SIZE() instead of NULL terminator.
> This reduces code base and makes it easier to read and understand.
[]
> diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
[]
> @@ -897,37 +897,31 @@ static int pci_netmos_init(struct pci_dev *dev)
>  /* enable IO_Space bit */
>  #define ITE_887x_POSIO_ENABLE		(1 << 31)
>  
> 
> +/* inta_addr are the configuration addresses of the ITE */
> +static const short inta_addr[] = { 0x2a0, 0x2c0, 0x220, 0x240, 0x1e0, 0x200, 0x280, };

Why move this outside the only function it's used in?
The trailing comma isn't necessary/useful and possibly confusing too.

>  static int pci_ite887x_init(struct pci_dev *dev)
>  {
> -	/* inta_addr are the configuration addresses of the ITE */
> -	static const short inta_addr[] = { 0x2a0, 0x2c0, 0x220, 0x240, 0x1e0,
> -							0x200, 0x280, 0 };
>  	int ret, i, type;
>  	struct resource *iobase = NULL;
>  	u32 miscr, uartbar, ioport;
> 
>  	/* search for the base-ioport */
> -	i = 0;
> -	while (inta_addr[i] && iobase == NULL) {
> -		iobase = request_region(inta_addr[i], ITE_887x_IOSIZE,
> -								"ite887x");
> +	for (i = 0; i < ARRAY_SIZE(inta_addr); i++) {
> +		iobase = request_region(inta_addr[i], ITE_887x_IOSIZE, "ite887x");
>  		if (iobase != NULL) {

continue and unindent the block below?

>  			/* write POSIO0R - speed | size | ioport */
>  			pci_write_config_dword(dev, ITE_887x_POSIO0,
>  				ITE_887x_POSIO_ENABLE | ITE_887x_POSIO_SPEED |
>  				ITE_887x_POSIO_IOSIZE_32 | inta_addr[i]);
>  			/* write INTCBAR - ioport */
> -			pci_write_config_dword(dev, ITE_887x_INTCBAR,
> -								inta_addr[i]);
> +			pci_write_config_dword(dev, ITE_887x_INTCBAR, inta_addr[i]);
>  			ret = inb(inta_addr[i]);
>  			if (ret != 0xff) {
>  				/* ioport connected */
>  				break;
>  			}
>  			release_region(iobase->start, ITE_887x_IOSIZE);
> -			iobase = NULL;
>  		}
> -		i++;
>  	}
>  
> 
>  	if (!inta_addr[i]) {