linux-kernel - RE: [PATCHv2 10/25] PCI: mobiveil: fix the INTx process error

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <HE1PR0401MB2235C1EBD0DF9EB219F5FFE8E8D90@HE1PR0401MB2235.eurprd04.prod.outlook.com>
Date:   Tue, 20 Nov 2018 11:00:43 +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 10/25] PCI: mobiveil: fix the INTx process error

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 10/25] PCI: mobiveil: fix the INTx process error
> 
> From: Hou Zhiqiang <Zhiqiang.Hou@....com>
> 
> In the loop block, there is not code change the loop key, this patch updated
> the loop key by re-read the INTx status register.
> 
> This patch also change to clear the handled INTx status.
> 
> Note: Need MV to test this fix.
> 
> Fixes: 9af6bcb11e12 ("PCI: mobiveil: Add Mobiveil PCIe Host Bridge IP driver")
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
> ---
> V2:
>  - Added fixes entry.
> 
>  drivers/pci/controller/pcie-mobiveil.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-mobiveil.c
> b/drivers/pci/controller/pcie-mobiveil.c
> index 4ba458474e42..78e575e71f4d 100644
> --- a/drivers/pci/controller/pcie-mobiveil.c
> +++ b/drivers/pci/controller/pcie-mobiveil.c
> @@ -361,6 +361,7 @@ static void mobiveil_pcie_isr(struct irq_desc *desc)
>  	/* Handle INTx */
>  	if (intr_status & PAB_INTP_INTX_MASK) {
>  		shifted_status = csr_readl(pcie,
> PAB_INTP_AMBA_MISC_STAT);
> +		shifted_status &= PAB_INTP_INTX_MASK;
>  		shifted_status >>= PAB_INTX_START;
>  		do {
>  			for_each_set_bit(bit, &shifted_status,
> PCI_NUM_INTX) { @@ -372,12 +373,16 @@ static void
> mobiveil_pcie_isr(struct irq_desc *desc)
>  					dev_err_ratelimited(dev,
> "unexpected IRQ, INT%d\n",
>  							    bit);
> 
> -				/* clear interrupt */
> -				csr_writel(pcie,
> -					   shifted_status << PAB_INTX_START,
> +				/* clear interrupt handled */
> +				csr_writel(pcie, 1 << (PAB_INTX_START + bit),
>  					   PAB_INTP_AMBA_MISC_STAT);
>  			}
> -		} while ((shifted_status >> PAB_INTX_START) != 0);
> +
> +			shifted_status = csr_readl(pcie,
> +
> PAB_INTP_AMBA_MISC_STAT);
> +			shifted_status &= PAB_INTP_INTX_MASK;
> +			shifted_status >>= PAB_INTX_START;
> +		} while (shifted_status != 0);
>  	}
> 
>  	/* read extra MSI status register */
> --
> 2.17.1