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This patch fixes the kernel panic issue when do reboot test on RV1126 USB AI Camera Board with the following error log: [3.818529] android_work: did not send uevent (0 0 (null)) [3.890319] android_work: sent uevent USB_STATE=CONNECTED [3.929523] configfs-gadget gadget: high-speed config #1: b [3.929743] configfs-gadget gadget: uvc_function_set_alt(2, 0) [3.929771] configfs-gadget gadget: reset UVC Control [3.929806] configfs-gadget gadget: uvc_function_set_alt(3, 0) [3.930243] android_work: sent uevent USB_STATE=CONFIGURED [3.931423] dwc3 ffd00000.dwc3: unexpected direction for Data Phase [3.931543] Unable to handle kernel NULL pointer dereference at virtual address 0000005c [3.933344] pgd = 6319bbbb [3.933600] [0000005c] *pgd=00000000 [3.933941] Internal error: Oops: 17 [#1] PREEMPT SMP ARM [3.934433] Modules linked in: galcore(O) [3.934832] CPU: 0 PID: 568 Comm: irq/61-dwc3 Tainted: G O 4.19.111 #9 [3.935523] Hardware name: Generic DT based system [3.935974] PC is at dwc3_ep0_interrupt+0x638/0x80c [3.936417] LR is at dwc3_thread_interrupt+0x7d4/0xbfc [3.936897] pc : [<b0521224>] lr : [<b051ea4c>] psr: 600d00d3 [3.937462] sp : e607fe88 ip : 00000003 fp : e837d040 [3.937925] r10: e830e640 r9 : 00000008 r8 : e8302900 [3.938386] r7 : 00000000 r6 : e607ff08 r5 : e837d040 r4 : b0c08c48 [3.938965] r3 : 00000050 r2 : 00000000 r1 : e9042000 r0 : 00000004 [3.939546] Flags: nZCv IRQs off FIQs off Mode SVC_32 ISA ARM Segment user [3.940213] Control: 10c5387d Table: 3671c06a DAC: 00000055 ... [4.013246] [<b0521224>] (dwc3_ep0_interrupt) from [<b051ea4c>] (dwc3_thread_interrupt+0x7d4/0xbfc) [4.014059] [<b051ea4c>] (dwc3_thread_interrupt) from [<b016ded0>] (irq_thread_fn+0x1c/0x7c) [4.014835] [<b016ded0>] (irq_thread_fn) from [<b016e1d4>] (irq_thread+0x124/0x200) [4.015520] [<b016e1d4>] (irq_thread) from [<b014290c>] (kthread+0x140/0x170) [4.016175] [<b014290c>] (kthread) from [<b01010d8>] (ret_from_fork+0x14/0x3c) [4.016831] Exception stack(0xe607ffb0 to 0xe607fff8) Change-Id: I4191444b527eb03a5283f662b1ad4c9d9c08cd19 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.