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

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Date:	Thu, 07 Apr 2016 14:03:45 +0300
From:	Mathias Nyman <mathias.nyman@...ux.intel.com>
To:	Thierry Reding <thierry.reding@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mathias Nyman <mathias.nyman@...el.com>
CC:	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 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()

Other than that I can't see any issues

-Mathias