[PATCH v2 1/3] nvmem: core: make default user binary file root-access only
From: Srinivas Kandagatla <hidden>
Date: 2015-10-07 11:00:53
Also in:
lkml
Subsystem:
nvmem framework, the rest · Maintainers:
Srinivas Kandagatla, Linus Torvalds
As required by many providers like at24/at25/mxs-ocotp/qfprom and may be other providers would want to allow root-only to read the nvmem content. So making the defaults to be root-only access would address the request and also provide flexibility to providers to specify there own permissions on top of the root-only using the perm flag in nvmem_config. Making this dynamic did cut down lot of static binary attributes in the code. Signed-off-by: Srinivas Kandagatla <redacted> --- drivers/nvmem/core.c | 52 +++++++++++----------------------------------------- 1 file changed, 11 insertions(+), 41 deletions(-)
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 6fd4e5a..0a70e31 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c@@ -31,6 +31,7 @@ struct nvmem_device { struct regmap *regmap; struct module *owner; struct device dev; + struct bin_attribute bin; int stride; int word_size; int ncells;
@@ -109,52 +110,15 @@ static ssize_t bin_attr_nvmem_write(struct file *filp, struct kobject *kobj, } /* default read/write permissions */ -static struct bin_attribute bin_attr_rw_nvmem = { +static struct bin_attribute bin_attr_template = { .attr = { .name = "nvmem", - .mode = S_IWUSR | S_IRUGO, + .mode = S_IRUSR, }, .read = bin_attr_nvmem_read, .write = bin_attr_nvmem_write, }; -static struct bin_attribute *nvmem_bin_rw_attributes[] = { - &bin_attr_rw_nvmem, - NULL, -}; - -static const struct attribute_group nvmem_bin_rw_group = { - .bin_attrs = nvmem_bin_rw_attributes, -}; - -static const struct attribute_group *nvmem_rw_dev_groups[] = { - &nvmem_bin_rw_group, - NULL, -}; - -/* read only permission */ -static struct bin_attribute bin_attr_ro_nvmem = { - .attr = { - .name = "nvmem", - .mode = S_IRUGO, - }, - .read = bin_attr_nvmem_read, -}; - -static struct bin_attribute *nvmem_bin_ro_attributes[] = { - &bin_attr_ro_nvmem, - NULL, -}; - -static const struct attribute_group nvmem_bin_ro_group = { - .bin_attrs = nvmem_bin_ro_attributes, -}; - -static const struct attribute_group *nvmem_ro_dev_groups[] = { - &nvmem_bin_ro_group, - NULL, -}; - static void nvmem_release(struct device *dev) { struct nvmem_device *nvmem = to_nvmem_device(dev);
@@ -346,9 +310,10 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config) nvmem->read_only = of_property_read_bool(np, "read-only") | config->read_only; + nvmem->bin = bin_attr_template; - nvmem->dev.groups = nvmem->read_only ? nvmem_ro_dev_groups : - nvmem_rw_dev_groups; + if (!nvmem->read_only) + nvmem->bin.attr.mode |= S_IWUSR; device_initialize(&nvmem->dev);
@@ -361,6 +326,10 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config) return ERR_PTR(rval); } + rval = device_create_bin_file(&nvmem->dev, &nvmem->bin); + if (rval) + dev_err(&nvmem->dev, "Failed to create nvmem binary file\n"); + if (config->cells) nvmem_add_cells(nvmem, config);
@@ -385,6 +354,7 @@ int nvmem_unregister(struct nvmem_device *nvmem) mutex_unlock(&nvmem_mutex); nvmem_device_remove_all_cells(nvmem); + device_remove_bin_file(&nvmem->dev, &nvmem->bin); device_del(&nvmem->dev); return 0;
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1.9.1