linux-kernel - Re: [PATCH v5 04/12] PCI: endpoint: Setting 64-bit/prefetch bit is invalid when IO is set

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Date:   Thu, 29 Mar 2018 15:12:02 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Niklas Cassel <niklas.cassel@...s.com>,
        <cyrille.pitchen@...e-electrons.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
CC:     Niklas Cassel <niklass@...s.com>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 04/12] PCI: endpoint: Setting 64-bit/prefetch bit is
 invalid when IO is set



On Wednesday 28 March 2018 05:20 PM, Niklas Cassel wrote:
> If flag PCI_BASE_ADDRESS_SPACE_IO is set, also having any
> PCI_BASE_ADDRESS_MEM_* bit set is invalid.
> 
> This sanity check is done in pci_epc_set_bar(), so that we don't need
> to do this sanity check in all epc->ops->set_bar() implementations.
> 
> Signed-off-by: Niklas Cassel <niklas.cassel@...s.com>
> ---
>  drivers/pci/endpoint/pci-epc-core.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
> index 109d75f0b7d2..40eea20d21f9 100644
> --- a/drivers/pci/endpoint/pci-epc-core.c
> +++ b/drivers/pci/endpoint/pci-epc-core.c
> @@ -309,10 +309,13 @@ int pci_epc_set_bar(struct pci_epc *epc, u8 func_no,
>  {
>  	int ret;
>  	unsigned long irq_flags;
> +	int flags = epf_bar->flags;
>  
>  	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
>  	    (epf_bar->barno == BAR_5 &&
> -	     epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64))
> +	     flags & PCI_BASE_ADDRESS_MEM_TYPE_64) ||
> +	    (flags & PCI_BASE_ADDRESS_SPACE_IO &&
> +	     flags & PCI_BASE_ADDRESS_IO_MASK))
>  		return -EINVAL;

If possible I'd like this to be split. But otherwise

Acked-by: Kishon Vijay Abraham I <kishon@...com>
>  
>  	if (!epc->ops->set_bar)
>