linux-kernel - Re: [PATCH v2 4/4] pcmcia: Convert to use pci_bus_for_each_resource

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Date:   Thu, 3 Nov 2022 18:03:24 +0100
From:   Dominik Brodowski <linux@...inikbrodowski.net>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Mickaël Salaün <mic@...ikod.net>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Arnd Bergmann <arnd@...db.de>,
        Bjorn Helgaas <helgaas@...nel.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        linux-alpha@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        sparclinux@...r.kernel.org, linux-pci@...r.kernel.org,
        xen-devel@...ts.xenproject.org, Miguel Ojeda <ojeda@...nel.org>,
        Richard Henderson <richard.henderson@...aro.org>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        "David S. Miller" <davem@...emloft.net>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
Subject: Re: [PATCH v2 4/4] pcmcia: Convert to use
 pci_bus_for_each_resource_p()

Am Thu, Nov 03, 2022 at 06:46:44PM +0200 schrieb Andy Shevchenko:
> The pci_bus_for_each_resource_p() hides the iterator loop since
> it may be not used otherwise. With this, we may drop that iterator
> variable definition.

Thanks for your patch!

> diff --git a/drivers/pcmcia/rsrc_nonstatic.c b/drivers/pcmcia/rsrc_nonstatic.c
> index ad1141fddb4c..9d92d4bb6239 100644
> --- a/drivers/pcmcia/rsrc_nonstatic.c
> +++ b/drivers/pcmcia/rsrc_nonstatic.c
> @@ -934,7 +934,7 @@ static int adjust_io(struct pcmcia_socket *s, unsigned int action, unsigned long
>  static int nonstatic_autoadd_resources(struct pcmcia_socket *s)
>  {
>  	struct resource *res;
> -	int i, done = 0;
> +	int done = 0;
>  
>  	if (!s->cb_dev || !s->cb_dev->bus)
>  		return -ENODEV;
> @@ -960,12 +960,9 @@ static int nonstatic_autoadd_resources(struct pcmcia_socket *s)
>  	 */
>  	if (s->cb_dev->bus->number == 0)
>  		return -EINVAL;
> -
> -	for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
> -		res = s->cb_dev->bus->resource[i];
> -#else
> -	pci_bus_for_each_resource(s->cb_dev->bus, res, i) {
>  #endif
> +
> +	pci_bus_for_each_resource_p(s->cb_dev->bus, res) {
>  		if (!res)
>  			continue;

Doesn't this remove the proper iterator for X86? Even if that is the right
thing to do, it needs an explict explanation.

>  
> diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c
> index 3966a6ceb1ac..b200f2b99a7a 100644
> --- a/drivers/pcmcia/yenta_socket.c
> +++ b/drivers/pcmcia/yenta_socket.c
> @@ -673,9 +673,8 @@ static int yenta_search_res(struct yenta_socket *socket, struct resource *res,
>  			    u32 min)
>  {
>  	struct resource *root;
> -	int i;
>  
> -	pci_bus_for_each_resource(socket->dev->bus, root, i) {
> +	pci_bus_for_each_resource_p(socket->dev->bus, root) {
>  		if (!root)
>  			continue;
>  

That looks fine!

Thanks,
	Dominik