hwmon: (sch5627) Use regmap for pwm map register caching

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Accessing virtual registers is very inefficient, so pwm map values
should be cached when possible, else userspace could effectively do
a DOS attack by reading pwm map values in a while loop.
Use the regmap cache to cache those values.

Tested on a Fujitsu Esprimo P720.

Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Link: https://lore.kernel.org/r/20230907052639.16491-4-W_Armin@gmx.de
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

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This commit is contained in:

Armin Wolf 2023-09-07 07:26:37 +02:00 • committed by Guenter Roeck

parent 7da8a63543

commit a54fe61639

4 changed files with 138 additions and 14 deletions

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1

drivers/hwmon/Kconfig

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72

drivers/hwmon/sch5627.c

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76

drivers/hwmon/sch56xx-common.c

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3

drivers/hwmon/sch56xx-common.h

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