Re: [bug report] HID: playstation: DS4: Don't fail on calibration data request

[Max Staudt <max@enpas.org>]

On 4/8/24 09:41, Dan Carpenter wrote:
> Hello Max Staudt,
> 
> Commit a48a7cd85f55 ("HID: playstation: DS4: Don't fail on
> calibration data request") from Feb 8, 2024 (linux-next), leads to
> the following Smatch static checker warning:
> 
> drivers/hid/hid-playstation.c:1904 dualshock4_get_calibration_data() error: uninitialized symbol 'acc_x_minus'.
> drivers/hid/hid-playstation.c:1904 dualshock4_get_calibration_data() error: uninitialized symbol 'acc_x_plus'.
> drivers/hid/hid-playstation.c:1910 dualshock4_get_calibration_data() error: uninitialized symbol 'acc_y_minus'.
> drivers/hid/hid-playstation.c:1910 dualshock4_get_calibration_data() error: uninitialized symbol 'acc_y_plus'.
> drivers/hid/hid-playstation.c:1916 dualshock4_get_calibration_data() error: uninitialized symbol 'acc_z_minus'.
> drivers/hid/hid-playstation.c:1916 dualshock4_get_calibration_data() error: uninitialized symbol 'acc_z_plus'.


Hi Dan, Jiri,

Thanks for the report!


Jiri, if you prefer to do so, please feel free to stop/revert this patch for now, and I'll send a better one soon.

The label "no_buffer_tail_check" was meant to jump straight to the sanity checks in order to have them write the fallback calibration values. But I missed that the part in between the two sanity checks can actually make the second sanity check pass with bogus values - as shown by Dan's check.


Max