linux-kernel - Re: [PATCH v4 2/6] PCI: rcar: Fix calculating mask for PCIEPAMR register

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Message-ID: <20200212140434.GA129189@google.com>
Date:   Wed, 12 Feb 2020 08:04:34 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Lad Prabhakar <prabhakar.csengg@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Marek Vasut <marek.vasut+renesas@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Andrew Murray <andrew.murray@....com>,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-renesas-soc@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v4 2/6] PCI: rcar: Fix calculating mask for PCIEPAMR
 register

On Sat, Feb 08, 2020 at 06:36:37PM +0000, Lad Prabhakar wrote:
> The mask value was calculated incorrectly for PCIEPAMR register if the
> size was less the 128bytes, this patch fixes the above by adding a check
> on size.

s/less the/less than/
s/128bytes,/128 bytes./
s/this patch fixes the above/Fix this issue/

> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
>  drivers/pci/controller/pcie-rcar.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-rcar.c b/drivers/pci/controller/pcie-rcar.c
> index d5568db..c76a92a 100644
> --- a/drivers/pci/controller/pcie-rcar.c
> +++ b/drivers/pci/controller/pcie-rcar.c
> @@ -71,7 +71,7 @@ void rcar_pcie_set_outbound(int win, void __iomem *base,
>  	/* Setup PCIe address space mappings for each resource */
>  	resource_size_t res_start;
>  	resource_size_t size;
> -	u32 mask;
> +	u32 mask = 0x0;
>  
>  	rcar_pci_write_reg(base, 0x00000000, PCIEPTCTLR(win));
>  
> @@ -80,7 +80,8 @@ void rcar_pcie_set_outbound(int win, void __iomem *base,
>  	 * keeps things pretty simple.
>  	 */
>  	size = resource_size(res);
> -	mask = (roundup_pow_of_two(size) / SZ_128) - 1;
> +	if (size > 128)
> +		mask = (roundup_pow_of_two(size) / SZ_128) - 1;

I would put the "mask = 0x0" right here so it's all in one place,
i.e.,

  if (size > 128)
    mask = (roundup_pow_of_two(size) / SZ_128) - 1;
  else
    mask = 0x0;

>  	rcar_pci_write_reg(base, mask << 7, PCIEPAMR(win));
>  
>  	if (!host) {
> -- 
> 2.7.4
>