This patch fixes the following panic when use uvc function and
do reboot during uvc preview.
Unable to handle kernel NULL pointer dereference at virtual address 000001fd
pgd = 85dd55c1
[000001fd] *pgd=00000000
Internal error: Oops: 17 [#1] PREEMPT SMP ARM
Modules linked in: galcore(O)
CPU: 0 PID: 716 Comm: xc:RkAiqCoreThr Tainted: G W O 4.19.111 #18
Hardware name: Generic DT based system
PC is at usb_gadget_deactivate+0x0/0x6c
LR is at usb_function_deactivate+0x54/0x74
It's because that do reboot operation will call configfs_composite_unbind()
to set cdev->gadget to NULL.
Change-Id: I6fbfe9b58f865113d04ca7ce0b74b00f8d89227c
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.