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f5dc93b787
The hid-sony driver has custom DS4 connect/disconnect logic for the DS4 dongle, which is a USB dongle acting as a proxy to Bluetooth connected DS4. The connect/disconnect logic works fine generally, however not in conjunction with Steam. Steam implements its own DS4 driver using hidraw. Both hid-sony and Steam are issuing their own HID requests and are racing each other during DS4 dongle connect/disconnect resulting in a kernel crash in hid-sony. The problem is that upon a DS4 connect to the dongle, hid-sony kicks of 'ds4_get_calibration_data' from within its dongle hotplug code. The calibration code issues raw HID feature report for reportID 0x02. When Steam is running, it issues a feature report for reportID 0x12 typically just prior to hid-sony requesting feature reportID 0x02. The result is that 'ds4_get_calibration_data' receives the data Steam requested as that's the HID report returing first. Currently this results in it processing invalid data, which ultimately results in a divide by zero upon a future 'dualshock4_parse_report'. The solution for now is to check within 'ds4_get_calibration_data' to check if we received data for the feature report we issued and if not retry. This fixes bug 206785. Signed-off-by: Roderick Colenbrander <roderick.colenbrander@sony.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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.