linux-kernel - Re: [PATCH v2] PCI: endpoint: Allocate enough space for fixed size BAR

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Date:   Tue, 11 Jun 2019 11:08:11 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Alan Mikhak <alan.mikhak@...ive.com>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        kishon@...com, linux-riscv@...ts.infradead.org, palmer@...ive.com,
        paul.walmsley@...ive.com
Subject: Re: [PATCH v2] PCI: endpoint: Allocate enough space for fixed size
 BAR

On Thu, May 23, 2019 at 02:47:59PM -0700, Alan Mikhak wrote:
> PCI endpoint test function code should honor the .bar_fixed_size parameter
> from underlying endpoint controller drivers or results may be unexpected.
> 
> In pci_epf_test_alloc_space(), check if BAR being used for test register
> space is a fixed size BAR. If so, allocate the required fixed size.
> 
> Signed-off-by: Alan Mikhak <alan.mikhak@...ive.com>
> ---
>  drivers/pci/endpoint/functions/pci-epf-test.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)

Applied to pci/endpoint for v5.3, thanks.

Lorenzo

> diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
> index 27806987e93b..7d41e6684b87 100644
> --- a/drivers/pci/endpoint/functions/pci-epf-test.c
> +++ b/drivers/pci/endpoint/functions/pci-epf-test.c
> @@ -434,10 +434,16 @@ static int pci_epf_test_alloc_space(struct pci_epf *epf)
>  	int bar;
>  	enum pci_barno test_reg_bar = epf_test->test_reg_bar;
>  	const struct pci_epc_features *epc_features;
> +	size_t test_reg_size;
>  
>  	epc_features = epf_test->epc_features;
>  
> -	base = pci_epf_alloc_space(epf, sizeof(struct pci_epf_test_reg),
> +	if (epc_features->bar_fixed_size[test_reg_bar])
> +		test_reg_size = bar_size[test_reg_bar];
> +	else
> +		test_reg_size = sizeof(struct pci_epf_test_reg);
> +
> +	base = pci_epf_alloc_space(epf, test_reg_size,
>  				   test_reg_bar, epc_features->align);
>  	if (!base) {
>  		dev_err(dev, "Failed to allocated register space\n");
> -- 
> 2.7.4
>