00e66f948a
[ Upstream commit 6eb04ca8c52e3f8c8ea7102ade81d642eee87f4a ] It was reported [0] that adding a generic joycon to the system caused a kernel crash on Steam Deck, with the below panic spew: divide error: 0000 [#1] PREEMPT SMP NOPTI [...] Hardware name: Valve Jupiter/Jupiter, BIOS F7A0119 10/24/2023 RIP: 0010:nintendo_hid_event+0x340/0xcc1 [hid_nintendo] [...] Call Trace: [...] ? exc_divide_error+0x38/0x50 ? nintendo_hid_event+0x340/0xcc1 [hid_nintendo] ? asm_exc_divide_error+0x1a/0x20 ? nintendo_hid_event+0x307/0xcc1 [hid_nintendo] hid_input_report+0x143/0x160 hidp_session_run+0x1ce/0x700 [hidp] Since it's a divide-by-0 error, by tracking the code for potential denominator issues, we've spotted 2 places in which this could happen; so let's guard against the possibility and log in the kernel if the condition happens. This is specially useful since some data that fills some denominators are read from the joycon HW in some cases, increasing the potential for flaws. [0] https://github.com/ValveSoftware/SteamOS/issues/1070 Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com> Tested-by: Sam Lantinga <slouken@libsdl.org> Signed-off-by: Jiri Kosina <jkosina@suse.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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.