Previously, the objects backing the configfs directories and files were created using devm managed memory on the coresight device.
Now we are adding configfs load/unload, configurations can be loaded many times over the lifetime of the device, so it is more appropriate to use normally allocated and freed memory.
Signed-off-by: Mike Leach mike.leach@linaro.org --- .../coresight/coresight-syscfg-configfs.c | 119 +++++++++++++----- 1 file changed, 88 insertions(+), 31 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-syscfg-configfs.c b/drivers/hwtracing/coresight/coresight-syscfg-configfs.c index 433ede94dd63..6e8c8db52d39 100644 --- a/drivers/hwtracing/coresight/coresight-syscfg-configfs.c +++ b/drivers/hwtracing/coresight/coresight-syscfg-configfs.c @@ -14,7 +14,7 @@ static inline struct config_item_type *cscfg_create_ci_type(void) { struct config_item_type *ci_type;
- ci_type = devm_kzalloc(cscfg_device(), sizeof(*ci_type), GFP_KERNEL); + ci_type = kzalloc(sizeof(*ci_type), GFP_KERNEL); if (ci_type) ci_type->ct_owner = THIS_MODULE;
@@ -175,6 +175,19 @@ static struct config_item_type cscfg_config_preset_type = { .ct_attrs = cscfg_config_preset_attrs, };
+ +/* walk list of presets and free the previously allocated memory */ +static void cscfg_destroy_preset_groups(struct config_group *cfg_view_group) +{ + struct cscfg_fs_preset *cfg_fs_preset; + struct config_group *p_group; + + list_for_each_entry(p_group, &cfg_view_group->default_groups, default_groups) { + cfg_fs_preset = container_of(p_group, struct cscfg_fs_preset, group); + kfree(cfg_fs_preset); + } +} + static int cscfg_add_preset_groups(struct cscfg_fs_config *cfg_view) { int preset_num; @@ -186,11 +199,12 @@ static int cscfg_add_preset_groups(struct cscfg_fs_config *cfg_view) return 0;
for (preset_num = 1; preset_num <= config_desc->nr_presets; preset_num++) { - cfg_fs_preset = devm_kzalloc(cscfg_device(), - sizeof(struct cscfg_fs_preset), GFP_KERNEL); + cfg_fs_preset = kzalloc(sizeof(struct cscfg_fs_preset), GFP_KERNEL);
- if (!cfg_fs_preset) + if (!cfg_fs_preset) { + cscfg_destroy_preset_groups(&cfg_view->group); return -ENOMEM; + }
snprintf(name, CONFIGFS_ITEM_NAME_LEN, "preset%d", preset_num); cfg_fs_preset->preset_num = preset_num; @@ -204,14 +218,10 @@ static int cscfg_add_preset_groups(struct cscfg_fs_config *cfg_view)
static struct config_group *cscfg_create_config_group(struct cscfg_config_desc *config_desc) { - struct cscfg_fs_config *cfg_view; - struct device *dev = cscfg_device(); + struct cscfg_fs_config *cfg_view = NULL; int err;
- if (!dev) - return ERR_PTR(-EINVAL); - - cfg_view = devm_kzalloc(dev, sizeof(struct cscfg_fs_config), GFP_KERNEL); + cfg_view = kzalloc(sizeof(struct cscfg_fs_config), GFP_KERNEL); if (!cfg_view) return ERR_PTR(-ENOMEM);
@@ -220,12 +230,21 @@ static struct config_group *cscfg_create_config_group(struct cscfg_config_desc *
/* add in a preset<n> dir for each preset */ err = cscfg_add_preset_groups(cfg_view); - if (err) + if (err) { + kfree(cfg_view); return ERR_PTR(err); - + } return &cfg_view->group; }
+static void cscfg_destroy_config_group(struct config_group *group) +{ + struct cscfg_fs_config *cfg_view = container_of(group, struct cscfg_fs_config, group); + + cscfg_destroy_preset_groups(&cfg_view->group); + kfree(cfg_view); +} + /* attributes for features view */
static ssize_t cscfg_feat_description_show(struct config_item *item, char *page) @@ -314,6 +333,17 @@ static struct config_item_type cscfg_param_view_type = { .ct_attrs = cscfg_param_view_attrs, };
+/* walk the list of default groups - which were set as param items and remove */ +static void cscfg_destroy_params_group_items(struct config_group *params_group) +{ + struct cscfg_fs_param *param_item; + struct config_group *p_group; + + list_for_each_entry(p_group, ¶ms_group->default_groups, default_groups) { + param_item = container_of(p_group, struct cscfg_fs_param, group); + kfree(param_item); + } +} /* * configfs has far less functionality provided to add attributes dynamically than sysfs, * and the show and store fns pass the enclosing config_item so the actual attribute cannot @@ -322,15 +352,16 @@ static struct config_item_type cscfg_param_view_type = { static int cscfg_create_params_group_items(struct cscfg_feature_desc *feat_desc, struct config_group *params_group) { - struct device *dev = cscfg_device(); struct cscfg_fs_param *param_item; int i;
/* parameter items - as groups with default_value attribute */ for (i = 0; i < feat_desc->nr_params; i++) { - param_item = devm_kzalloc(dev, sizeof(struct cscfg_fs_param), GFP_KERNEL); - if (!param_item) + param_item = kzalloc(sizeof(struct cscfg_fs_param), GFP_KERNEL); + if (!param_item) { + cscfg_destroy_params_group_items(params_group); return -ENOMEM; + } param_item->feat_desc = feat_desc; param_item->param_idx = i; config_group_init_type_name(¶m_item->group, @@ -343,27 +374,22 @@ static int cscfg_create_params_group_items(struct cscfg_feature_desc *feat_desc,
static struct config_group *cscfg_create_feature_group(struct cscfg_feature_desc *feat_desc) { - struct cscfg_fs_feature *feat_view; - struct config_item_type *params_group_type; + struct cscfg_fs_feature *feat_view = NULL; + struct config_item_type *params_group_type = NULL; struct config_group *params_group = NULL; - struct device *dev = cscfg_device(); - int item_err; - - if (!dev) - return ERR_PTR(-EINVAL); + int err = -ENOMEM;
- feat_view = devm_kzalloc(dev, sizeof(struct cscfg_fs_feature), GFP_KERNEL); + feat_view = kzalloc(sizeof(struct cscfg_fs_feature), GFP_KERNEL); if (!feat_view) return ERR_PTR(-ENOMEM);
if (feat_desc->nr_params) { - params_group = devm_kzalloc(dev, sizeof(struct config_group), GFP_KERNEL); + params_group = kzalloc(sizeof(struct config_group), GFP_KERNEL); if (!params_group) - return ERR_PTR(-ENOMEM); - + goto exit_err_free_mem; params_group_type = cscfg_create_ci_type(); if (!params_group_type) - return ERR_PTR(-ENOMEM); + goto exit_err_free_mem; }
feat_view->feat_desc = feat_desc; @@ -373,11 +399,36 @@ static struct config_group *cscfg_create_feature_group(struct cscfg_feature_desc if (params_group) { config_group_init_type_name(params_group, "params", params_group_type); configfs_add_default_group(params_group, &feat_view->group); - item_err = cscfg_create_params_group_items(feat_desc, params_group); - if (item_err) - return ERR_PTR(item_err); + err = cscfg_create_params_group_items(feat_desc, params_group); + if (err) + goto exit_err_free_mem; } return &feat_view->group; + +exit_err_free_mem: + kfree(feat_view); + kfree(params_group_type); + kfree(params_group); + return ERR_PTR(err); +} + +static void cscfg_destroy_feature_group(struct config_group *feat_group) +{ + struct cscfg_fs_feature *feat_view; + struct config_group *params_group = NULL; + + feat_view = container_of(feat_group, struct cscfg_fs_feature, group); + + /* params group is the first item on the default group list */ + if (!list_empty(&feat_group->default_groups)) { + params_group = list_first_entry(&feat_group->default_groups, + struct config_group, default_groups); + cscfg_destroy_params_group_items(params_group); + /* free the item type, then the group */ + kfree(params_group->cg_item.ci_type); + kfree(params_group); + } + kfree(feat_view); }
static struct config_item_type cscfg_configs_type = { @@ -403,6 +454,8 @@ int cscfg_configfs_add_config(struct cscfg_config_desc *config_desc) err = configfs_register_group(&cscfg_configs_grp, new_group); if (!err) config_desc->fs_group = new_group; + else + cscfg_destroy_config_group(new_group); return err; }
@@ -410,6 +463,7 @@ void cscfg_configfs_del_config(struct cscfg_config_desc *config_desc) { if (config_desc->fs_group) { configfs_unregister_group(config_desc->fs_group); + cscfg_destroy_config_group(config_desc->fs_group); config_desc->fs_group = NULL; } } @@ -434,9 +488,11 @@ int cscfg_configfs_add_feature(struct cscfg_feature_desc *feat_desc) new_group = cscfg_create_feature_group(feat_desc); if (IS_ERR(new_group)) return PTR_ERR(new_group); - err = configfs_register_group(&cscfg_features_grp, new_group); + err = configfs_register_group(&cscfg_features_grp, new_group); if (!err) feat_desc->fs_group = new_group; + else + cscfg_destroy_feature_group(new_group); return err; }
@@ -444,6 +500,7 @@ void cscfg_configfs_del_feature(struct cscfg_feature_desc *feat_desc) { if (feat_desc->fs_group) { configfs_unregister_group(feat_desc->fs_group); + cscfg_destroy_feature_group(feat_desc->fs_group); feat_desc->fs_group = NULL; } }