linux-kernel - Re: [PATCH v2] usb: host: xhci-plat: Assign shared_hcd->rsrc

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Message-ID: <2025010711-blush-glamorous-9498@gregkh>
Date: Tue, 7 Jan 2025 11:36:22 +0100
From: Greg KH <gregkh@...uxfoundation.org>
To: WangYuli <wangyuli@...ontech.com>
Cc: mathias.nyman@...el.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, niklas.neronin@...ux.intel.com,
	quic_wcheng@...cinc.com, andriy.shevchenko@...ux.intel.com,
	michal.pecio@...il.com, guanwentao@...ontech.com,
	zhanjun@...ontech.com, bigeasy@...utronix.de, balbi@...com,
	sarah.a.sharp@...ux.intel.com, hkallweit1@...il.com,
	Xu Rao <raoxu@...ontech.com>
Subject: Re: [PATCH v2] usb: host: xhci-plat: Assign shared_hcd->rsrc_start

On Sat, Jan 04, 2025 at 11:51:11PM +0800, WangYuli wrote:
> When inserting a USB device, examining hcd->rsrc_start can be
> helpful in identifying which hcd is mounted, as the physical
> address represented here is typically unique.
> 
> The following code snippet demonstrates this:
>   struct usb_hcd *hcd = bus_to_hcd(udev->bus);
>   unsigned long long usb_hcd_addr = (unsigned long long)hcd->rsrc_start;
> 
> However, this approach has limitations now. For USB hosts with an
> MMIO interface, the effectiveness of this method is restricted to
> USB 2.0.
> 
> Becase commit 3429e91a661e ("usb: host: xhci: add platform driver
> support") assigned res->start to hcd->rsrc_start. But
> shared_hcd->rsrc_start remains unassigned, which is also necessary
> in certain scenarios.
> 
> Co-developed-by: Xu Rao <raoxu@...ontech.com>
> Signed-off-by: Xu Rao <raoxu@...ontech.com>
> Signed-off-by: WangYuli <wangyuli@...ontech.com>
> --
> Changlog:
>   v1 -> v2: Move code changes for commit e0fe986972f5 ("usb: host:
> xhci-plat: prepare operation w/o shared hcd").
> ---

What commit id does this fix?

thanks,

greg k-h