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mfd: rk808: Check pm_power_off pointer 

The function pointer pm_power_off may point to function from other
module (PSCI for example). If rk808 is removed, pm_power_off is
overwritten to NULL and the system cannot be powered off.

This patch checks if pm_power_off points to a module function.

Signed-off-by: Stefan Mavrodiev <stefan@olimex.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Stefan Mavrodiev 2019-06-07 15:42:25 +03:00 committed by Lee Jones
parent 554e937ec8
commit 7630499464
2 changed files with 12 additions and 6 deletions
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17
drivers/mfd/rk808.c
View File

@ -562,7 +562,6 @@ static int rk808_probe(struct i2c_client *client,
struct rk808 *rk808;
const struct rk808_reg_data *pre_init_reg;
const struct mfd_cell *cells;
void (*pm_pwroff_fn)(void) = NULL;
int nr_pre_init_regs;
int nr_cells;
int pm_off = 0, msb, lsb;
@ -609,7 +608,7 @@ static int rk808_probe(struct i2c_client *client,
nr_pre_init_regs = ARRAY_SIZE(rk805_pre_init_reg);
cells = rk805s;
nr_cells = ARRAY_SIZE(rk805s);
pm_pwroff_fn = rk805_device_shutdown;
rk808->pm_pwroff_fn = rk805_device_shutdown;
break;
case RK808_ID:
rk808->regmap_cfg = &rk808_regmap_config;
@ -618,7 +617,7 @@ static int rk808_probe(struct i2c_client *client,
nr_pre_init_regs = ARRAY_SIZE(rk808_pre_init_reg);
cells = rk808s;
nr_cells = ARRAY_SIZE(rk808s);
pm_pwroff_fn = rk808_device_shutdown;
rk808->pm_pwroff_fn = rk808_device_shutdown;
break;
case RK818_ID:
rk808->regmap_cfg = &rk818_regmap_config;
@ -627,7 +626,7 @@ static int rk808_probe(struct i2c_client *client,
nr_pre_init_regs = ARRAY_SIZE(rk818_pre_init_reg);
cells = rk818s;
nr_cells = ARRAY_SIZE(rk818s);
pm_pwroff_fn = rk818_device_shutdown;
rk808->pm_pwroff_fn = rk818_device_shutdown;
break;
case RK809_ID:
case RK817_ID:
@ -692,7 +691,7 @@ static int rk808_probe(struct i2c_client *client,
"rockchip,system-power-controller");
if (pm_off && !pm_power_off) {
rk808_i2c_client = client;
pm_power_off = pm_pwroff_fn;
pm_power_off = rk808->pm_pwroff_fn;
}
return 0;
@ -707,7 +706,13 @@ static int rk808_remove(struct i2c_client *client)
struct rk808 *rk808 = i2c_get_clientdata(client);
regmap_del_irq_chip(client->irq, rk808->irq_data);
pm_power_off = NULL;
/**
* pm_power_off may points to a function from another module.
* Check if the pointer is set by us and only then overwrite it.
*/
if (rk808->pm_pwroff_fn && pm_power_off == rk808->pm_pwroff_fn)
pm_power_off = NULL;
return 0;
}

1
include/linux/mfd/rk808.h
View File

@ -628,5 +628,6 @@ struct rk808 {
long variant;
const struct regmap_config *regmap_cfg;
const struct regmap_irq_chip *regmap_irq_chip;
void (*pm_pwroff_fn)(void);
};
#endif /* __LINUX_REGULATOR_RK808_H */