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When we use /sys/class/udc/<udc>/soft_connect to do a logical disconnection from the USB Host on RK3399 Excavator Board, it dumps the warning log: Trying to free already-free IRQ 231 WARNING: CPU: 2 PID: 1308 at kernel/irq/manage.c:1628 __free_irq+0xa0/0x2e0 Modules linked in: CPU: 2 PID: 1308 Comm: adbd Not tainted 4.19.80 #49 Hardware name: Rockchip RK3399 Excavator Board edp avb (Android) (DT) pstate: 40400085 (nZcv daIf +PAN -UAO) pc : __free_irq+0xa0/0x2e0 lr : __free_irq+0xa0/0x2e0 ... Call trace: __free_irq+0xa0/0x2e0 free_irq+0x38/0x90 dwc3_gadget_stop+0x58/0x80 usb_gadget_remove_driver+0x50/0x70 usb_gadget_unregister_driver+0xc0/0x110 unregister_gadget+0x20/0x50 unregister_gadget_item+0x24/0x38 ffs_data_clear+0x120/0x130 ffs_data_reset+0x14/0x50 ffs_data_closed+0x88/0xd8 ffs_epfile_release+0x20/0x30 To solve the problem, don't call free_irq() in dwc3_gadget_stop() if dwc->gadget_driver is NULL. Change-Id: I9d5b5b354612c3ce3677b3d15cf6af1fcbf3f399 Signed-off-by: William Wu <william.wu@rock-chips.com>
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.