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Date: Fri, 18 Jul 2008 08:56:01 +0100 From: Ben Dooks <ben-linux@...ff.org> To: Magnus Damm <magnus.damm@...il.com> Cc: linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org, gregkh@...e.de, lethal@...ux-sh.org, i2c@...sensors.org, akpm@...ux-foundation.org Subject: Re: [PATCH 02/05] resource: add resource_type() and IORESOURCE_TYPE_BITS On Fri, Jul 18, 2008 at 04:40:18PM +0900, Magnus Damm wrote: > From: Magnus Damm <damm@...l.co.jp> > > This patch adds resource_type() and IORESOURCE_TYPE_BITS. They make it > easier to add more resource types without having to rewrite tons of code. This looks ok to me, with one concern as shown below. > Signed-off-by: Magnus Damm <damm@...l.co.jp> > --- > > drivers/base/platform.c | 31 +++++++++++++++++-------------- > include/linux/ioport.h | 7 ++++++- > 2 files changed, 23 insertions(+), 15 deletions(-) > > --- 0001/drivers/base/platform.c > +++ work/drivers/base/platform.c 2008-07-09 20:19:16.000000000 +0900 > @@ -42,10 +42,8 @@ struct resource *platform_get_resource(s > for (i = 0; i < dev->num_resources; i++) { > struct resource *r = &dev->resource[i]; > > - if ((r->flags & (IORESOURCE_IO|IORESOURCE_MEM| > - IORESOURCE_IRQ|IORESOURCE_DMA)) == type) > - if (num-- == 0) > - return r; > + if (type == resource_type(r) && num-- == 0) > + return r; > } > return NULL; > } > @@ -78,10 +76,8 @@ struct resource *platform_get_resource_b > for (i = 0; i < dev->num_resources; i++) { > struct resource *r = &dev->resource[i]; > > - if ((r->flags & (IORESOURCE_IO|IORESOURCE_MEM| > - IORESOURCE_IRQ|IORESOURCE_DMA)) == type) > - if (!strcmp(r->name, name)) > - return r; > + if (type == resource_type(r) && !strcmp(r->name, name)) > + return r; > } > return NULL; > } > @@ -259,9 +255,9 @@ int platform_device_add(struct platform_ > > p = r->parent; > if (!p) { > - if (r->flags & IORESOURCE_MEM) > + if (resource_type(r) == IORESOURCE_MEM) > p = &iomem_resource; > - else if (r->flags & IORESOURCE_IO) > + else if (resource_type(r) == IORESOURCE_IO) > p = &ioport_resource; > } You are changing a simple test to a mask and compare, is anyone going to produce resources with an IORESOURCE_MEM and an IORESOURCE_IO together? > @@ -282,9 +278,14 @@ int platform_device_add(struct platform_ > return ret; > > failed: > - while (--i >= 0) > - if (pdev->resource[i].flags & (IORESOURCE_MEM|IORESOURCE_IO)) > - release_resource(&pdev->resource[i]); > + while (--i >= 0) { > + struct resource *r = &pdev->resource[i]; > + unsigned long type = resource_type(r); > + > + if (type == IORESOURCE_MEM || type == IORESOURCE_IO) > + release_resource(r); > + } > + > return ret; > } > EXPORT_SYMBOL_GPL(platform_device_add); > @@ -306,7 +307,9 @@ void platform_device_del(struct platform > > for (i = 0; i < pdev->num_resources; i++) { > struct resource *r = &pdev->resource[i]; > - if (r->flags & (IORESOURCE_MEM|IORESOURCE_IO)) > + unsigned long type = resource_type(r); > + > + if (type == IORESOURCE_MEM || type == IORESOURCE_IO) > release_resource(r); > } > } > --- 0002/include/linux/ioport.h > +++ work/include/linux/ioport.h 2008-07-09 15:16:48.000000000 +0900 > @@ -34,7 +34,8 @@ struct resource_list { > */ > #define IORESOURCE_BITS 0x000000ff /* Bus-specific bits */ > > -#define IORESOURCE_IO 0x00000100 /* Resource type */ > +#define IORESOURCE_TYPE_BITS 0x00000f00 /* Resource type */ > +#define IORESOURCE_IO 0x00000100 > #define IORESOURCE_MEM 0x00000200 > #define IORESOURCE_IRQ 0x00000400 > #define IORESOURCE_DMA 0x00000800 > @@ -117,6 +118,10 @@ static inline resource_size_t resource_s > { > return res->end - res->start + 1; > } > +static inline unsigned long resource_type(struct resource *res) > +{ > + return res->flags & IORESOURCE_TYPE_BITS; > +} > > /* Convenience shorthand with allocation */ > #define request_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name)) > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- Ben (ben@...ff.org, http://www.fluff.org/) 'a smiley only costs 4 bytes' -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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