linux-kernel - Re: [PATCH v12 6/9] usb: xhci: use bus->sysdev for DMA configuration

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: <85873d69-5664-0603-8cbd-a250d29ac335@ti.com>
Date:   Thu, 9 Feb 2017 13:53:25 +0200
From:   Roger Quadros <rogerq@...com>
To:     Jack Pham <jackp@...eaurora.org>, Peter Chen <peter.chen@....com>
CC:     <gregkh@...uxfoundation.org>, <stern@...land.harvard.edu>,
        <ulf.hansson@...aro.org>, <broonie@...nel.org>, <sre@...nel.org>,
        <robh+dt@...nel.org>, <shawnguo@...nel.org>, <rjw@...ysocki.net>,
        <dbaryshkov@...il.com>, <heiko@...ech.de>,
        <linux-arm-kernel@...ts.infradead.org>, <p.zabel@...gutronix.de>,
        <devicetree@...r.kernel.org>, <pawel.moll@....com>,
        <mark.rutland@....com>, <linux-usb@...r.kernel.org>,
        <arnd@...db.de>, <s.hauer@...gutronix.de>,
        <mail@...iej.szmigiero.name>, <troy.kisky@...ndarydevices.com>,
        <festevam@...il.com>, <oscar@...andei.net>,
        <stephen.boyd@...aro.org>, <linux-pm@...r.kernel.org>,
        <stillcompiling@...il.com>, <linux-kernel@...r.kernel.org>,
        <mka@...omium.org>, <vaibhav.hiremath@...aro.org>,
        <gary.bisson@...ndarydevices.com>, <hverkuil@...all.nl>,
        <krzk@...nel.org>, Sriram Dash <sriram.dash@....com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>
Subject: Re: [PATCH v12 6/9] usb: xhci: use bus->sysdev for DMA configuration



On 08/02/17 22:43, Jack Pham wrote:
> Hi Peter, Sriram, Arnd,
> 
> On Mon, Feb 06, 2017 at 05:13:38PM +0800, Peter Chen wrote:
>> From: Arnd Bergmann <arnd@...db.de>
>>
>> For xhci-hcd platform device, all the DMA parameters are not
>> configured properly, notably dma ops for dwc3 devices. So, set
>> the dma for xhci from sysdev. sysdev is pointing to device that
>> is known to the system firmware or hardware.
>>
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>> Signed-off-by: Sriram Dash <sriram.dash@....com>
>> Tested-by: Baolin Wang <baolin.wang@...aro.org>
>> Tested-by: Vivek Gautam <vivek.gautam@...eaurora.org>
>> Tested-by: Alexander Sverdlin <alexander.sverdlin@...ia.com>
>> Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
>> ---
>> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
>> index 6d33b42..7a9c860 100644
>> --- a/drivers/usb/host/xhci-plat.c
>> +++ b/drivers/usb/host/xhci-plat.c
> 
>> -	hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
>> +	hcd = __usb_create_hcd(driver, sysdev, &pdev->dev,
>> +			       dev_name(&pdev->dev), NULL);
> 
> As mentioned already in [1], usb_create_shared_hcd() is called to create
> the second bus, however it also needs to be converted.
> 
> Not exactly as Roger's suggestion but this worked for me:
> 
> -       xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,
> +       xhci->shared_hcd = __usb_create_hcd(driver, sysdev, &pdev->dev,
>                         dev_name(&pdev->dev), hcd);

But we're creating a shared_hcd and there is an API for that so why not use it
instead of calling __usb_create_hcd()?

>         if (!xhci->shared_hcd) {
>                 ret = -ENOMEM;
> 
> Without this, SuperSpeed devices fail to enumerate:
> 
>  usb 2-1: new SuperSpeed USB device number 2 using xhci-hcd
>  usb 2-1: device descriptor read/8, error -11
>  usb 2-1: new SuperSpeed USB device number 2 using xhci-hcd
>  usb 2-1: device descriptor read/8, error -11
>  usb 2-1: new SuperSpeed USB device number 3 using xhci-hcd
>  usb 2-1: device descriptor read/8, error -11
>  usb 2-1: new SuperSpeed USB device number 3 using xhci-hcd
>  usb 2-1: device descriptor read/8, error -11
>  <and continues...>
> 
> Thanks,
> Jack
> 
> [1] https://lkml.org/lkml/2016/12/9/240
> 

-- 
cheers,
-roger