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Xu Yang b089cdb7e1 usb: dwc3: imx8mp: fix software node kernel dump 
commit a4faee0117 upstream.

When unbind and bind the device again, kernel will dump below warning:

[  173.972130] sysfs: cannot create duplicate filename '/devices/platform/soc/4c010010.usb/software_node'
[  173.981564] CPU: 2 UID: 0 PID: 536 Comm: sh Not tainted 6.12.0-rc6-06344-g2aed7c4a5c56 #144
[  173.989923] Hardware name: NXP i.MX95 15X15 board (DT)
[  173.995062] Call trace:
[  173.997509]  dump_backtrace+0x90/0xe8
[  174.001196]  show_stack+0x18/0x24
[  174.004524]  dump_stack_lvl+0x74/0x8c
[  174.008198]  dump_stack+0x18/0x24
[  174.011526]  sysfs_warn_dup+0x64/0x80
[  174.015201]  sysfs_do_create_link_sd+0xf0/0xf8
[  174.019656]  sysfs_create_link+0x20/0x40
[  174.023590]  software_node_notify+0x90/0x100
[  174.027872]  device_create_managed_software_node+0xec/0x108
...

The '4c010010.usb' device is a platform device created during the initcall
and is never removed, which causes its associated software node to persist
indefinitely.

The existing device_create_managed_software_node() does not provide a
corresponding removal function.

Replace device_create_managed_software_node() with the
device_add_software_node() and device_remove_software_node() pair to ensure
proper addition and removal of software nodes, addressing this issue.

Fixes: a9400f1979 ("usb: dwc3: imx8mp: add 2 software managed quirk properties for host mode")
Cc: stable@vger.kernel.org
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20241126032841.2458338-1-xu.yang_2@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2024-12-19 18:13:05 +01:00
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README 

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.