linux-kernel - RE: [PATCHv2 17/25] PCI: mobiveil: fix the checking of valid device

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Message-ID: <HE1PR0401MB22354A5A97A9E871B99FD42AE8D90@HE1PR0401MB2235.eurprd04.prod.outlook.com>
Date:   Tue, 20 Nov 2018 11:26:13 +0000
From:   "M.h. Lian" <minghuan.lian@....com>
To:     "Z.q. Hou" <zhiqiang.hou@....com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "l.subrahmanya@...iveil.co.in" <l.subrahmanya@...iveil.co.in>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        Leo Li <leoyang.li@....com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>
CC:     Mingkai Hu <mingkai.hu@....com>, Xiaowei Bao <xiaowei.bao@....com>
Subject: RE: [PATCHv2 17/25] PCI: mobiveil: fix the checking of valid device

reviewed-by: Minghuan Lian <Minghuan.Lian@....com>

> -----Original Message-----
> From: Z.q. Hou
> Sent: Tuesday, November 20, 2018 5:27 PM
> To: linux-pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> devicetree@...r.kernel.org; linux-kernel@...r.kernel.org;
> bhelgaas@...gle.com; robh+dt@...nel.org; mark.rutland@....com;
> l.subrahmanya@...iveil.co.in; shawnguo@...nel.org; Leo Li
> <leoyang.li@....com>; lorenzo.pieralisi@....com;
> catalin.marinas@....com; will.deacon@....com
> Cc: Mingkai Hu <mingkai.hu@....com>; M.h. Lian
> <minghuan.lian@....com>; Xiaowei Bao <xiaowei.bao@....com>; Z.q. Hou
> <zhiqiang.hou@....com>
> Subject: [PATCHv2 17/25] PCI: mobiveil: fix the checking of valid device
> 
> From: Hou Zhiqiang <Zhiqiang.Hou@....com>
> 
> Avoid to issue CFG transactions to link partner when the PCIe link is not up.
> And allow CFG transactions to all functions of Endpoint implemented
> multiple functions.
> 
> Fixes: 9af6bcb11e12 ("PCI: mobiveil: Add Mobiveil PCIe Host Bridge IP driver")
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
> ---
> V2:
>  - New patch
> 
>  drivers/pci/controller/mobiveil/pcie-mobiveil-host.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> index dc5324d94466..1ae82e790562 100644
> --- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> @@ -29,6 +29,10 @@ static bool mobiveil_pcie_valid_device(struct pci_bus
> *bus, unsigned int devfn)  {
>  	struct mobiveil_pcie *pcie = bus->sysdata;
> 
> +	/* If there is no link, then there is no device */
> +	if (bus->number > pcie->rp.root_bus_nr
> && !mobiveil_pcie_link_up(pcie))
> +		return false;
> +
>  	/* Only one device down on each root port */
>  	if ((bus->number == pcie->rp.root_bus_nr) && (devfn > 0))
>  		return false;
> @@ -37,7 +41,7 @@ static bool mobiveil_pcie_valid_device(struct pci_bus
> *bus, unsigned int devfn)
>  	 * Do not read more than one device on the bus directly
>  	 * attached to RC
>  	 */
> -	if ((bus->primary == pcie->rp.root_bus_nr) && (devfn > 0))
> +	if ((bus->primary == pcie->rp.root_bus_nr) && (PCI_SLOT(devfn) > 0))
>  		return false;
> 
>  	return true;
> --
> 2.17.1