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| author |   Oleksij Rempel <o.rempel@pengutronix.de> | 2020-11-17 15:33:24 -0800 |
|---|---|---|
| committer |   Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2020-11-17 16:28:16 -0800 |
| commit | 820830ec918f6c3dcd77a54a1c6198ab57407916 (patch) | |
| tree | c9c02b7ed4df1010b0794fb2c5f6a60efe0d1638 /tools/perf/scripts/python/stackcollapse.py | |
| parent | Input: ads7846 - convert to full duplex (diff) | |
Input: ads7846 - fix integer overflow on Rt calculation
In some rare cases the 32 bit Rt value will overflow if z2 and x is max,
z1 is minimal value and x_plate_ohms is relatively high (for example 800
ohm). This would happen on some screen age with low pressure.
There are two possible fixes:
- make Rt 64bit
- reorder calculation to avoid overflow
The second variant seems to be preferable, since 64 bit calculation on
32 bit system is a bit more expensive.
Fixes: ffa458c1bd9b6f653008d450f337602f3d52a646 ("spi: ads7846 driver")
Co-developed-by: David Jander <david@protonic.nl>
Signed-off-by: David Jander <david@protonic.nl>
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://lore.kernel.org/r/20201113112240.1360-1-o.rempel@pengutronix.de
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'tools/perf/scripts/python/stackcollapse.py')
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