Oleksij Rempel b312f09e31 Input: ads7846 - fix integer overflow on Rt calculation ...

[ Upstream commit 820830ec91 ]

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: ffa458c1bd ("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>

2023-05-16 09:57:06 +09:00

..

gameport

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misc

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mouse

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rmi4

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tablet

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touchscreen

Input: ads7846 - fix integer overflow on Rt calculation

2023-05-16 09:57:06 +09:00

apm-power.c

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input-compat.c

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input-compat.h

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input-leds.c

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input-mt.c

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input-polldev.c

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input.c

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joydev.c

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Kconfig

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keycombo.c

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keyreset.c

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Makefile

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matrix-keymap.c

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mousedev.c

Input: mousedev - fix implicit conversion warning

2018-04-08 12:12:43 +02:00

sparse-keymap.c

treewide: Fix typo in Documentation/DocBook

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