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Commit 586f83e2 authored by David Rientjes's avatar David Rientjes Committed by Linus Torvalds
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pnp: only assign IORESOURCE_DMA if CONFIG_ISA_DMA_API is enabled 



IORESOURCE_DMA cannot be assigned without utilizing the interface
provided by CONFIG_ISA_DMA_API, specifically request_dma() and
free_dma().  Thus, there's a strict dependency on the config option and
limits IORESOURCE_DMA only to architectures that support ISA-style DMA.

ia64 is not one of those architectures, so pnp_check_dma() no longer
needs to be special-cased for that architecture.

pnp_assign_resources() will now return -EINVAL if IORESOURCE_DMA is
attempted on such a kernel.

Signed-off-by: default avatarDavid Rientjes <rientjes@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ff859ba6

drivers/pnp/base.h

+2 −0
Original line number Diff line number Diff line
@@ -142,7 +142,9 @@ void __pnp_remove_device(struct pnp_dev *dev); 
int pnp_check_port(struct pnp_dev *dev, struct resource *res);

int pnp_check_mem(struct pnp_dev *dev, struct resource *res);

int pnp_check_irq(struct pnp_dev *dev, struct resource *res);

#ifdef CONFIG_ISA_DMA_API

int pnp_check_dma(struct pnp_dev *dev, struct resource *res);

#endif



char *pnp_resource_type_name(struct resource *res);

void dbg_pnp_show_resources(struct pnp_dev *dev, char *desc);

drivers/pnp/manager.c

+6 −1
Original line number Diff line number Diff line
@@ -171,6 +171,7 @@ __add: 
	return 0;

}



#ifdef CONFIG_ISA_DMA_API

static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)

{

	struct resource *res, local_res;
@@ -210,6 +211,7 @@ __add: 
	pnp_add_dma_resource(dev, res->start, res->flags);

	return 0;

}

#endif /* CONFIG_ISA_DMA_API */



void pnp_init_resources(struct pnp_dev *dev)

{
@@ -234,7 +236,8 @@ static void pnp_clean_resource_table(struct pnp_dev *dev) 
static int pnp_assign_resources(struct pnp_dev *dev, int set)

{

	struct pnp_option *option;

	int nport = 0, nmem = 0, nirq = 0, ndma = 0;

	int nport = 0, nmem = 0, nirq = 0;

	int ndma __maybe_unused = 0;

	int ret = 0;



	pnp_dbg(&dev->dev, "pnp_assign_resources, try dependent set %d\n", set);
@@ -256,9 +259,11 @@ static int pnp_assign_resources(struct pnp_dev *dev, int set) 
		case IORESOURCE_IRQ:

			ret = pnp_assign_irq(dev, &option->u.irq, nirq++);

			break;

#ifdef CONFIG_ISA_DMA_API

		case IORESOURCE_DMA:

			ret = pnp_assign_dma(dev, &option->u.dma, ndma++);

			break;

#endif

		default:

			ret = -EINVAL;

			break;

drivers/pnp/resource.c

+2 −5
Original line number Diff line number Diff line
@@ -409,9 +409,9 @@ int pnp_check_irq(struct pnp_dev *dev, struct resource *res) 
	return 1;

}



#ifdef CONFIG_ISA_DMA_API

int pnp_check_dma(struct pnp_dev *dev, struct resource *res)

{

#ifndef CONFIG_IA64

	int i;

	struct pnp_dev *tdev;

	struct resource *tres;
@@ -466,11 +466,8 @@ int pnp_check_dma(struct pnp_dev *dev, struct resource *res) 
	}



	return 1;

#else

	/* IA64 does not have legacy DMA */

	return 0;

#endif

}

#endif /* CONFIG_ISA_DMA_API */



unsigned long pnp_resource_type(struct resource *res)

{