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24b5b1978c
Enabling the framebuffer leads to a system hang. Running, as a debug
hack, the store_pan() function in drivers/video/fbdev/core/fbsysfs.c
without taking the console_lock, allows to see the crash backtrace on
the serial line.
~ # echo 0 0 > /sys/class/graphics/fb0/pan
[ 9.719414] Unhandled exception: IPSR = 00000005 LR = fffffff1
[ 9.726937] CPU: 0 PID: 49 Comm: sh Not tainted 5.13.0-rc5 #9
[ 9.733008] Hardware name: STM32 (Device Tree Support)
[ 9.738296] PC is at clk_gate_is_enabled+0x0/0x28
[ 9.743426] LR is at stm32f4_pll_div_set_rate+0xf/0x38
[ 9.748857] pc : [<0011e4be>] lr : [<0011f9e3>] psr: 0100000b
[ 9.755373] sp : 00bc7be0 ip : 00000000 fp : 001f3ac4
[ 9.760812] r10: 002610d0 r9 : 01efe920 r8 : 00540560
[ 9.766269] r7 : 02e7ddb0 r6 : 0173eed8 r5 : 00000000 r4 : 004027c0
[ 9.773081] r3 : 0011e4bf r2 : 02e7ddb0 r1 : 0173eed8 r0 : 1d3267b8
[ 9.779911] xPSR: 0100000b
[ 9.782719] CPU: 0 PID: 49 Comm: sh Not tainted 5.13.0-rc5 #9
[ 9.788791] Hardware name: STM32 (Device Tree Support)
[ 9.794120] [<0000afa1>] (unwind_backtrace) from [<0000a33f>] (show_stack+0xb/0xc)
[ 9.802421] [<0000a33f>] (show_stack) from [<0000a8df>] (__invalid_entry+0x4b/0x4c)
The `pll_num' field in the post_div_data configuration contained a wrong
value which also referenced an uninitialized hardware clock when
clk_register_pll_div() was called.
Fixes:
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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.
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.