linux-kernel - Re: [PATCH v10 8/9] usb: xhci: Add NVIDIA Tegra XUSB controller driver

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Message-ID: <57064981.2030004@linux.intel.com>
Date:	Thu, 07 Apr 2016 14:50:25 +0300
From:	Mathias Nyman <mathias.nyman@...ux.intel.com>
To:	Thierry Reding <thierry.reding@...il.com>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Andrew Bresticker <abrestic@...omium.org>,
	linux-tegra@...r.kernel.org, devicetree@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 8/9] usb: xhci: Add NVIDIA Tegra XUSB controller driver

On 07.04.2016 14:05, Thierry Reding wrote:
> On Thu, Apr 07, 2016 at 02:03:45PM +0300, Mathias Nyman wrote:
>> On 04.03.2016 18:19, Thierry Reding wrote:
>>> From: Thierry Reding <treding@...dia.com>
>>>
>>> Add support for the on-chip XUSB controller present on Tegra SoCs. This
>>> controller, when loaded with external firmware, exposes an interface
>>> compliant with xHCI. This driver loads the firmware, starts the
>>> controller, and is able to service host-specific messages sent by the
>>> controller's firmware.
>>>
>>> The controller also supports USB device mode as well as powergating
>>> of the SuperSpeed and host-controller logic when not in use, but
>>> support for these is not yet implemented.
>>>
>>> Based on work by:
>>>     Ajay Gupta <ajayg@...dia.com>
>>>     Bharath Yadav <byadav@...dia.com>
>>>     Andrew Bresticker <abrestic@...omium.org>
>>>
>>> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>>> Cc: Mathias Nyman <mathias.nyman@...el.com>
>>> Signed-off-by: Thierry Reding <treding@...dia.com>
>>> ---
>>
>> ...
>>
>>> +static int tegra_xusb_remove(struct platform_device *pdev)
>>> +{
>>> +	struct tegra_xusb *tegra = platform_get_drvdata(pdev);
>>   > +	struct usb_hcd *hcd = tegra->hcd;
>>> +	struct xhci_hcd *xhci;
>>> +
>>> +	if (tegra->fw_loaded) {
>>> +		xhci = hcd_to_xhci(hcd);
>>> +		usb_remove_hcd(xhci->shared_hcd);
>>> +		usb_put_hcd(xhci->shared_hcd);
>>> +		usb_remove_hcd(hcd);
>>> +		tegra_xusb_padctl_put(tegra->padctl);
>>> +		usb_put_hcd(hcd);
>>> +		kfree(xhci);
>>
>> Don't free xhci here, xhci is a part of hcd (hcd_priv) and hcd is already freed in usb_put_hcd()
>
> Ah, this was indeed reported to me about two weeks ago and fixed since
> then in my local tree.
>
>> Other than that I can't see any issues
>
> Thanks. Does this count as an Acked-by provided the kfree() is removed?
>

yes,

Acked-by: Mathias Nyman <mathias.nyman@...ux.intel.com>