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commit 01ef7f1b8713a78ab1a9512cf8096d2474c70633 upstream. Commit9beeee6584("USB: EHCI: log a warning if ehci-hcd is not loaded first") said that ehci-hcd should be loaded before ohci-hcd and uhci-hcd. However, commit05c92da0c5("usb: ohci/uhci - add soft dependencies on ehci_pci") only makes ohci-pci/uhci-pci depend on ehci- pci, which is not enough and we may still see the warnings in boot log. To eliminate the warnings we should make ohci-hcd/uhci-hcd depend on ehci-hcd. But Alan said that the warning introduced by9beeee6584is bogus, we only need the soft dependencies in the PCI level rather than the HCD level. However, there is really another neccessary soft dependencies between ohci-platform/uhci-platform and ehci-platform, which is added by this patch. The boot logs are below. 1. ohci-platform loaded before ehci-platform: ohci-platform 1f058000.usb: Generic Platform OHCI controller ohci-platform 1f058000.usb: new USB bus registered, assigned bus number 1 ohci-platform 1f058000.usb: irq 28, io mem 0x1f058000 hub 1-0:1.0: USB hub found hub 1-0:1.0: 4 ports detected Warning! ehci_hcd should always be loaded before uhci_hcd and ohci_hcd, not after usb 1-4: new low-speed USB device number 2 using ohci-platform ehci-platform 1f050000.usb: EHCI Host Controller ehci-platform 1f050000.usb: new USB bus registered, assigned bus number 2 ehci-platform 1f050000.usb: irq 29, io mem 0x1f050000 ehci-platform 1f050000.usb: USB 2.0 started, EHCI 1.00 usb 1-4: device descriptor read/all, error -62 hub 2-0:1.0: USB hub found hub 2-0:1.0: 4 ports detected usb 1-4: new low-speed USB device number 3 using ohci-platform input: YSPRINGTECH USB OPTICAL MOUSE as /devices/platform/bus@10000000/1f058000.usb/usb1/1-4/1-4:1.0/0003:10C4:8105.0001/input/input0 hid-generic 0003:10C4:8105.0001: input,hidraw0: USB HID v1.11 Mouse [YSPRINGTECH USB OPTICAL MOUSE] on usb-1f058000.usb-4/input0 2. ehci-platform loaded before ohci-platform: ehci-platform 1f050000.usb: EHCI Host Controller ehci-platform 1f050000.usb: new USB bus registered, assigned bus number 1 ehci-platform 1f050000.usb: irq 28, io mem 0x1f050000 ehci-platform 1f050000.usb: USB 2.0 started, EHCI 1.00 hub 1-0:1.0: USB hub found hub 1-0:1.0: 4 ports detected ohci-platform 1f058000.usb: Generic Platform OHCI controller ohci-platform 1f058000.usb: new USB bus registered, assigned bus number 2 ohci-platform 1f058000.usb: irq 29, io mem 0x1f058000 hub 2-0:1.0: USB hub found hub 2-0:1.0: 4 ports detected usb 2-4: new low-speed USB device number 2 using ohci-platform input: YSPRINGTECH USB OPTICAL MOUSE as /devices/platform/bus@10000000/1f058000.usb/usb2/2-4/2-4:1.0/0003:10C4:8105.0001/input/input0 hid-generic 0003:10C4:8105.0001: input,hidraw0: USB HID v1.11 Mouse [YSPRINGTECH USB OPTICAL MOUSE] on usb-1f058000.usb-4/input0 In the later case, there is no re-connection for USB-1.0/1.1 devices, which is expected. Cc: stable <stable@kernel.org> Reported-by: Shengwen Xiao <atzlinux@sina.com> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> Reviewed-by: Alan Stern <stern@rowland.harvard.edu> Link: https://patch.msgid.link/20260112084802.1995923-1-chenhuacai@loongson.cn Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Ulrich Hecht <uli@kernel.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 Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
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.