From 157ba1bb5fcb91366df3be5e63a04b799ff9cf64 Mon Sep 17 00:00:00 2001 From: Sebastian Reichel Date: Fri, 28 Sep 2018 17:35:37 +0200 Subject: [PATCH] power: supply: charger-manager: fix race-condition in sysfs registration This registers custom sysfs properties using the native functionality of the power-supply framework, which cleans up the code a bit and fixes a race-condition. Before this patch the sysfs attributes were not properly registered to udev. Signed-off-by: Sebastian Reichel --- drivers/power/supply/charger-manager.c | 51 +++++++++++--------------- include/linux/power/charger-manager.h | 3 +- 2 files changed, 24 insertions(+), 30 deletions(-) diff --git a/drivers/power/supply/charger-manager.c b/drivers/power/supply/charger-manager.c index 2e579da5c0b9..38be91f21cc4 100644 --- a/drivers/power/supply/charger-manager.c +++ b/drivers/power/supply/charger-manager.c @@ -1351,7 +1351,7 @@ static ssize_t charger_externally_control_store(struct device *dev, } /** - * charger_manager_register_sysfs - Register sysfs entry for each charger + * charger_manager_prepare_sysfs - Prepare sysfs entry for each charger * @cm: the Charger Manager representing the battery. * * This function add sysfs entry for charger(regulator) to control charger from @@ -1363,13 +1363,12 @@ static ssize_t charger_externally_control_store(struct device *dev, * externally_control, this charger isn't controlled from charger-manager and * always stay off state of regulator. */ -static int charger_manager_register_sysfs(struct charger_manager *cm) +static int charger_manager_prepare_sysfs(struct charger_manager *cm) { struct charger_desc *desc = cm->desc; struct charger_regulator *charger; int chargers_externally_control = 1; char *name; - int ret; int i; /* Create sysfs entry to control charger(regulator) */ @@ -1384,8 +1383,10 @@ static int charger_manager_register_sysfs(struct charger_manager *cm) charger->attrs[1] = &charger->attr_state.attr; charger->attrs[2] = &charger->attr_externally_control.attr; charger->attrs[3] = NULL; - charger->attr_g.name = name; - charger->attr_g.attrs = charger->attrs; + + charger->attr_grp.name = name; + charger->attr_grp.attrs = charger->attrs; + desc->sysfs_groups[i] = &charger->attr_grp; sysfs_attr_init(&charger->attr_name.attr); charger->attr_name.attr.name = "name"; @@ -1412,14 +1413,6 @@ static int charger_manager_register_sysfs(struct charger_manager *cm) dev_info(cm->dev, "'%s' regulator's externally_control is %d\n", charger->regulator_name, charger->externally_control); - - ret = sysfs_create_group(&cm->charger_psy->dev.kobj, - &charger->attr_g); - if (ret < 0) { - dev_err(cm->dev, "Cannot create sysfs entry of %s regulator\n", - charger->regulator_name); - return ret; - } } if (chargers_externally_control) { @@ -1560,6 +1553,13 @@ static struct charger_desc *of_cm_parse_desc(struct device *dev) desc->charger_regulators = chg_regs; + desc->sysfs_groups = devm_kcalloc(dev, + desc->num_charger_regulators + 1, + sizeof(*desc->sysfs_groups), + GFP_KERNEL); + if (!desc->sysfs_groups) + return ERR_PTR(-ENOMEM); + for_each_child_of_node(np, child) { struct charger_cable *cables; struct device_node *_child; @@ -1762,6 +1762,15 @@ static int charger_manager_probe(struct platform_device *pdev) INIT_DELAYED_WORK(&cm->fullbatt_vchk_work, fullbatt_vchk); + /* Register sysfs entry for charger(regulator) */ + ret = charger_manager_prepare_sysfs(cm); + if (ret < 0) { + dev_err(&pdev->dev, + "Cannot prepare sysfs entry of regulators\n"); + return ret; + } + psy_cfg.attr_grp = desc->sysfs_groups; + cm->charger_psy = power_supply_register(&pdev->dev, &cm->charger_psy_desc, &psy_cfg); @@ -1778,14 +1787,6 @@ static int charger_manager_probe(struct platform_device *pdev) goto err_reg_extcon; } - /* Register sysfs entry for charger(regulator) */ - ret = charger_manager_register_sysfs(cm); - if (ret < 0) { - dev_err(&pdev->dev, - "Cannot initialize sysfs entry of regulator\n"); - goto err_reg_sysfs; - } - /* Add to the list */ mutex_lock(&cm_list_mtx); list_add(&cm->entry, &cm_list); @@ -1809,14 +1810,6 @@ static int charger_manager_probe(struct platform_device *pdev) return 0; -err_reg_sysfs: - for (i = 0; i < desc->num_charger_regulators; i++) { - struct charger_regulator *charger; - - charger = &desc->charger_regulators[i]; - sysfs_remove_group(&cm->charger_psy->dev.kobj, - &charger->attr_g); - } err_reg_extcon: for (i = 0; i < desc->num_charger_regulators; i++) { struct charger_regulator *charger; diff --git a/include/linux/power/charger-manager.h b/include/linux/power/charger-manager.h index c4fa907c8f14..2ce8d00c20de 100644 --- a/include/linux/power/charger-manager.h +++ b/include/linux/power/charger-manager.h @@ -119,7 +119,7 @@ struct charger_regulator { struct charger_cable *cables; int num_cables; - struct attribute_group attr_g; + struct attribute_group attr_grp; struct device_attribute attr_name; struct device_attribute attr_state; struct device_attribute attr_externally_control; @@ -186,6 +186,7 @@ struct charger_desc { int num_charger_regulators; struct charger_regulator *charger_regulators; + const struct attribute_group **sysfs_groups; const char *psy_fuel_gauge;