diff options
| author | Armin Wolf <W_Armin@gmx.de> | 2023-09-07 08:26:37 +0300 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2023-10-27 17:27:24 +0300 |
| commit | a54fe61639d9f3b6765fee32edda7cfceb6d705a (patch) | |
| tree | 9709cc7d9bec857e1cfdfc4f1a422ce0906078c0 /drivers/hwmon/sch56xx-common.h | |
| parent | 7da8a635436029957c5350da3acf51d78ed64071 (diff) | |
| download | linux-a54fe61639d9f3b6765fee32edda7cfceb6d705a.tar.xz | |
hwmon: (sch5627) Use regmap for pwm map register caching
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>
Diffstat (limited to 'drivers/hwmon/sch56xx-common.h')
| -rw-r--r-- | drivers/hwmon/sch56xx-common.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/hwmon/sch56xx-common.h b/drivers/hwmon/sch56xx-common.h index e907d9da0dd5..3fb1cddbf977 100644 --- a/drivers/hwmon/sch56xx-common.h +++ b/drivers/hwmon/sch56xx-common.h @@ -5,9 +5,12 @@ ***************************************************************************/ #include <linux/mutex.h> +#include <linux/regmap.h> struct sch56xx_watchdog_data; +struct regmap *devm_regmap_init_sch56xx(struct device *dev, struct mutex *lock, u16 addr, + const struct regmap_config *config); int sch56xx_read_virtual_reg(u16 addr, u16 reg); int sch56xx_write_virtual_reg(u16 addr, u16 reg, u8 val); int sch56xx_read_virtual_reg16(u16 addr, u16 reg); |