Subject: [PATCH RFC 1/2] drivers: pci: fix window allocation order wrt bus_range filtering

From: [email-masked] (Bjorn Helgaas)
Date: Wed, 5 Nov 2014 17:05:36 -0700

On Thu, Oct 23, 2014 at 04:23:06PM +0100, Lorenzo Pieralisi wrote:
> The number of windows allocated for the host bridge depends on the
> bus resource. Instead of first allocating the windows and then
> limit the bus resource, this patch reshuffles the code so that if any
> limitation is applied to the bus resource it is taken into account in
> the windows allocation.
> 
> Cc: Will Deacon <[email-masked]>
> Signed-off-by: Lorenzo Pieralisi <[email-masked]>

I applied these with Will's acks to pci/host-generic for v3.19, thanks!

In my mind, posting patches to the list is implicitly a request for
comments, so I usually don't pay too much attention to things explicitly
marked "RFC" because I figure that's a hint that "this is work-in-progress,
please comment if you see anything obviously broken."

Bjorn

> ---
>  drivers/pci/host/pci-host-generic.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c
> index 3d2076f..1e1a80f 100644
> --- a/drivers/pci/host/pci-host-generic.c
> +++ b/drivers/pci/host/pci-host-generic.c
> @@ -276,17 +276,17 @@ static int gen_pci_parse_map_cfg_windows(struct gen_pci *pci)
>  		return err;
>  	}
>  
> -	pci->cfg.win = devm_kcalloc(dev, resource_size(&pci->cfg.bus_range),
> -				    sizeof(*pci->cfg.win), GFP_KERNEL);
> -	if (!pci->cfg.win)
> -		return -ENOMEM;
> -
>  	/* Limit the bus-range to fit within reg */
>  	bus_max = pci->cfg.bus_range.start +
>  		  (resource_size(&pci->cfg.res) >> pci->cfg.ops->bus_shift) - 1;
>  	pci->cfg.bus_range.end = min_t(resource_size_t, pci->cfg.bus_range.end,
>  				       bus_max);
>  
> +	pci->cfg.win = devm_kcalloc(dev, resource_size(&pci->cfg.bus_range),
> +				    sizeof(*pci->cfg.win), GFP_KERNEL);
> +	if (!pci->cfg.win)
> +		return -ENOMEM;
> +
>  	/* Map our Configuration Space windows */
>  	if (!devm_request_mem_region(dev, pci->cfg.res.start,
>  				     resource_size(&pci->cfg.res),
> -- 
> 2.1.2
> 
> 
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