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594c82329e
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. Because commit3429e91a66("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. Fixes:3429e91a66("usb: host: xhci: add platform driver support") Co-developed-by: Xu Rao <raoxu@uniontech.com> Signed-off-by: Xu Rao <raoxu@uniontech.com> Signed-off-by: WangYuli <wangyuli@uniontech.com> Link: https://lore.kernel.org/r/186B9F56972457B4+20250107133854.172309-1-wangyuli@uniontech.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.