linux-kernel - Re: [PATCH 3/3] PNP: Handle IORESOURCE

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Date:	Tue, 24 Apr 2012 07:45:33 +0200
From:	Witold Szczeponik <Witold.Szczeponik@....net>
To:	bhelgaas@...gle.com, lenb@...nel.org
CC:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 3/3] PNP: Handle IORESOURCE_BITS in resource allocation

One small correction: the subject line should read

   [PATCH V2 3/3] PNP: Handle IORESOURCE_BITS in resource allocation

to reflect that this patch is part of the second version of this patch series.


--- Witold



On 11/04/12 22:51, Witold Szczeponik wrote:

> The patch copies the flags masked by IORESOURCE_BITS from a resource's
> template.  This is necessary because the resource settings require proper
> IORESOURCE_BITS which are not known during the definition of these
> resources using the "/sys/bus/pnp/*/*/resources" interface.  (In fact,
> they should not be set by the user as the resource templates define the
> proper settings.)
> 
> If the patch is not applied, the resource flags are not initialized properly
> and obscure messages in the kernel log have been seen ("invalid flags").
> 
> The patch is applied against Linux 3.3.x.
> 
> 
> Signed-off-by: Witold Szczeponik<Witold.Szczeponik@....net>
> 
> 
> Index: linux/drivers/pnp/manager.c
> ===================================================================
> --- linux.orig/drivers/pnp/manager.c
> +++ linux/drivers/pnp/manager.c
> @@ -18,11 +18,27 @@
> 
>   DEFINE_MUTEX(pnp_res_mutex);
> 
> +static struct resource *pnp_find_resource(struct pnp_dev *dev,
> +					  unsigned char rule,
> +					  unsigned long type,
> +					  unsigned int bar)
> +{
> +	struct resource *res = pnp_get_resource(dev, type, bar);
> +
> +	/* when the resource already exists, set its resource bits from rule */
> +	if (res) {
> +		res->flags&= ~IORESOURCE_BITS;
> +		res->flags |= rule&  IORESOURCE_BITS;
> +	}
> +
> +	return res;
> +}
> +
>   static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)
>   {
>   	struct resource *res, local_res;
> 
> -	res = pnp_get_resource(dev, IORESOURCE_IO, idx);
> +	res = pnp_find_resource(dev, rule->flags, IORESOURCE_IO, idx);
>   	if (res) {
>   		pnp_dbg(&dev->dev, "  io %d already set to %#llx-%#llx "
>   			"flags %#lx\n", idx, (unsigned long long) res->start,
> @@ -65,7 +81,7 @@ static int pnp_assign_mem(struct pnp_dev
>   {
>   	struct resource *res, local_res;
> 
> -	res = pnp_get_resource(dev, IORESOURCE_MEM, idx);
> +	res = pnp_find_resource(dev, rule->flags, IORESOURCE_MEM, idx);
>   	if (res) {
>   		pnp_dbg(&dev->dev, "  mem %d already set to %#llx-%#llx "
>   			"flags %#lx\n", idx, (unsigned long long) res->start,
> @@ -78,6 +94,7 @@ static int pnp_assign_mem(struct pnp_dev
>   	res->start = 0;
>   	res->end = 0;
> 
> +	/* ??? rule->flags restricted to 8 bits, all tests bogus ??? */
>   	if (!(rule->flags&  IORESOURCE_MEM_WRITEABLE))
>   		res->flags |= IORESOURCE_READONLY;
>   	if (rule->flags&  IORESOURCE_MEM_CACHEABLE)
> @@ -123,7 +140,7 @@ static int pnp_assign_irq(struct pnp_dev
>   		5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
>   	};
> 
> -	res = pnp_get_resource(dev, IORESOURCE_IRQ, idx);
> +	res = pnp_find_resource(dev, rule->flags, IORESOURCE_IRQ, idx);
>   	if (res) {
>   		pnp_dbg(&dev->dev, "  irq %d already set to %d flags %#lx\n",
>   			idx, (int) res->start, res->flags);
> @@ -182,7 +199,7 @@ static int pnp_assign_dma(struct pnp_dev
>   		1, 3, 5, 6, 7, 0, 2, 4
>   	};
> 
> -	res = pnp_get_resource(dev, IORESOURCE_DMA, idx);
> +	res = pnp_find_resource(dev, rule->flags, IORESOURCE_DMA, idx);
>   	if (res) {
>   		pnp_dbg(&dev->dev, "  dma %d already set to %d flags %#lx\n",
>   			idx, (int) res->start, res->flags);
> 
> 
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