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| author | Oleksij Rempel <o.rempel@pengutronix.de> | 2020-11-17 15:33:24 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-29 13:42:36 +0100 |
| commit | e43d44187fd601f7074f1407f96d83be9d4de0cf (patch) | |
| tree | aeffa062bf72045b7afff89b342f55a6221ca27d /tools/perf/scripts/python/netdev-times.py | |
| parent | 010278c4273511c41b63fcbabcf7d84e5efd84f9 (diff) | |
Input: ads7846 - fix integer overflow on Rt calculation
[ Upstream commit 820830ec918f6c3dcd77a54a1c6198ab57407916 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/netdev-times.py')
0 files changed, 0 insertions, 0 deletions