Register with kernel poweroff handler instead of setting pm_power_off directly. Register with a low priority value of 64 to reflect that the original code only sets pm_power_off if it was not already set.
Cc: Lee Jones <lee.jo...@linaro.org> Cc: Samuel Ortiz <sa...@linux.intel.com> Signed-off-by: Guenter Roeck <li...@roeck-us.net> --- drivers/mfd/retu-mfd.c | 33 +++++++++++++++++++-------------- 1 file changed, 19 insertions(+), 14 deletions(-) diff --git a/drivers/mfd/retu-mfd.c b/drivers/mfd/retu-mfd.c index 663f8a3..64b60fa 100644 --- a/drivers/mfd/retu-mfd.c +++ b/drivers/mfd/retu-mfd.c @@ -22,6 +22,8 @@ #include <linux/slab.h> #include <linux/mutex.h> #include <linux/module.h> +#include <linux/notifier.h> +#include <linux/pm.h> #include <linux/regmap.h> #include <linux/mfd/core.h> #include <linux/mfd/retu.h> @@ -43,6 +45,7 @@ struct retu_dev { struct device *dev; struct mutex mutex; struct regmap_irq_chip_data *irq_data; + struct notifier_block poweroff_nb; }; static struct resource retu_pwrbutton_res[] = { @@ -81,9 +84,6 @@ static struct regmap_irq_chip retu_irq_chip = { .ack_base = RETU_REG_IDR, }; -/* Retu device registered for the power off. */ -static struct retu_dev *retu_pm_power_off; - static struct resource tahvo_usb_res[] = { { .name = "tahvo-usb", @@ -165,12 +165,14 @@ int retu_write(struct retu_dev *rdev, u8 reg, u16 data) } EXPORT_SYMBOL_GPL(retu_write); -static void retu_power_off(void) +static int retu_power_off(struct notifier_block *this, unsigned long unused1, + void *unused2) { - struct retu_dev *rdev = retu_pm_power_off; + struct retu_dev *rdev = container_of(this, struct retu_dev, + poweroff_nb); int reg; - mutex_lock(&retu_pm_power_off->mutex); + mutex_lock(&rdev->mutex); /* Ignore power button state */ regmap_read(rdev->regmap, RETU_REG_CC1, ®); @@ -183,7 +185,9 @@ static void retu_power_off(void) for (;;) cpu_relax(); - mutex_unlock(&retu_pm_power_off->mutex); + mutex_unlock(&rdev->mutex); + + return NOTIFY_DONE; } static int retu_regmap_read(void *context, const void *reg, size_t reg_size, @@ -279,9 +283,13 @@ static int retu_probe(struct i2c_client *i2c, const struct i2c_device_id *id) return ret; } - if (i2c->addr == 1 && !pm_power_off) { - retu_pm_power_off = rdev; - pm_power_off = retu_power_off; + if (i2c->addr == 1) { + rdev->poweroff_nb.notifier_call = retu_power_off; + rdev->poweroff_nb.priority = 64; + ret = register_poweroff_handler(&rdev->poweroff_nb); + if (ret) + dev_err(rdev->dev, + "Failed to register poweroff handler\n"); } return 0; @@ -291,10 +299,7 @@ static int retu_remove(struct i2c_client *i2c) { struct retu_dev *rdev = i2c_get_clientdata(i2c); - if (retu_pm_power_off == rdev) { - pm_power_off = NULL; - retu_pm_power_off = NULL; - } + unregister_poweroff_handler(&rdev->poweroff_nb); mfd_remove_devices(rdev->dev); regmap_del_irq_chip(i2c->irq, rdev->irq_data); -- 1.9.1 ------------------------------------------------------------------------------ Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel