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nvmem: core: use is_bin_visible for permissions 

By using is_bin_visible callback to set permissions will remove a
large list of attribute groups. These group permissions can be
dynamically derived in the callback.

Also add checks for read/write callbacks and set permissions accordingly.

Suggested-by: Greg KH <gregkh@linuxfoundation.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200325131951.31887-2-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Srinivas Kandagatla 2020-03-25 13:19:50 +00:00 committed by Greg Kroah-Hartman
parent f60442ddc4
commit 664f054938
3 changed files with 33 additions and 66 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/nvmem/core.c
View File

@ -396,7 +396,7 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
nvmem->read_only = device_property_present(config->dev, "read-only") ||
config->read_only || !nvmem->reg_write;
nvmem->dev.groups = nvmem_sysfs_get_groups(nvmem, config);
nvmem->dev.groups = nvmem_sysfs_get_groups();
dev_dbg(&nvmem->dev, "Registering nvmem device %s\n", config->name);

89
drivers/nvmem/nvmem-sysfs.c
View File

@ -104,6 +104,28 @@ static ssize_t bin_attr_nvmem_write(struct file *filp, struct kobject *kobj,
return count;
}
static umode_t nvmem_bin_attr_is_visible(struct kobject *kobj,
struct bin_attribute *attr, int i)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct nvmem_device *nvmem = to_nvmem_device(dev);
umode_t mode = 0400;
if (!nvmem->root_only)
mode |= 0044;
if (!nvmem->read_only)
mode |= 0200;
if (!nvmem->reg_write)
mode &= ~0200;
if (!nvmem->reg_read)
mode &= ~0444;
return mode;
}
/* default read/write permissions */
static struct bin_attribute bin_attr_rw_nvmem = {
.attr = {
@ -114,18 +136,19 @@ static struct bin_attribute bin_attr_rw_nvmem = {
.write = bin_attr_nvmem_write,
};
static struct bin_attribute *nvmem_bin_rw_attributes[] = {
static struct bin_attribute *nvmem_bin_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_bin_group = {
.bin_attrs = nvmem_bin_attributes,
.attrs = nvmem_attrs,
.is_bin_visible = nvmem_bin_attr_is_visible,
};
static const struct attribute_group *nvmem_rw_dev_groups[] = {
&nvmem_bin_rw_group,
static const struct attribute_group *nvmem_dev_groups[] = {
&nvmem_bin_group,
NULL,
};
@ -138,21 +161,6 @@ static struct bin_attribute bin_attr_ro_nvmem = {
.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,
.attrs = nvmem_attrs,
};
static const struct attribute_group *nvmem_ro_dev_groups[] = {
&nvmem_bin_ro_group,
NULL,
};
/* default read/write permissions, root only */
static struct bin_attribute bin_attr_rw_root_nvmem = {
.attr = {
@ -163,21 +171,6 @@ static struct bin_attribute bin_attr_rw_root_nvmem = {
.write = bin_attr_nvmem_write,
};
static struct bin_attribute *nvmem_bin_rw_root_attributes[] = {
&bin_attr_rw_root_nvmem,
NULL,
};
static const struct attribute_group nvmem_bin_rw_root_group = {
.bin_attrs = nvmem_bin_rw_root_attributes,
.attrs = nvmem_attrs,
};
static const struct attribute_group *nvmem_rw_root_dev_groups[] = {
&nvmem_bin_rw_root_group,
NULL,
};
/* read only permission, root only */
static struct bin_attribute bin_attr_ro_root_nvmem = {
.attr = {
@ -187,31 +180,9 @@ static struct bin_attribute bin_attr_ro_root_nvmem = {
.read = bin_attr_nvmem_read,
};
static struct bin_attribute *nvmem_bin_ro_root_attributes[] = {
&bin_attr_ro_root_nvmem,
NULL,
};
static const struct attribute_group nvmem_bin_ro_root_group = {
.bin_attrs = nvmem_bin_ro_root_attributes,
.attrs = nvmem_attrs,
};
static const struct attribute_group *nvmem_ro_root_dev_groups[] = {
&nvmem_bin_ro_root_group,
NULL,
};
const struct attribute_group **nvmem_sysfs_get_groups(
struct nvmem_device *nvmem,
const struct nvmem_config *config)
const struct attribute_group **nvmem_sysfs_get_groups(void)
{
if (config->root_only)
return nvmem->read_only ?
nvmem_ro_root_dev_groups :
nvmem_rw_root_dev_groups;
return nvmem->read_only ? nvmem_ro_dev_groups : nvmem_rw_dev_groups;
return nvmem_dev_groups;
}
/*

8
drivers/nvmem/nvmem.h
View File

@ -36,17 +36,13 @@ struct nvmem_device {
#define FLAG_COMPAT BIT(0)
#ifdef CONFIG_NVMEM_SYSFS
const struct attribute_group **nvmem_sysfs_get_groups(
struct nvmem_device *nvmem,
const struct nvmem_config *config);
const struct attribute_group **nvmem_sysfs_get_groups(void);
int nvmem_sysfs_setup_compat(struct nvmem_device *nvmem,
const struct nvmem_config *config);
void nvmem_sysfs_remove_compat(struct nvmem_device *nvmem,
const struct nvmem_config *config);
#else
static inline const struct attribute_group **nvmem_sysfs_get_groups(
struct nvmem_device *nvmem,
const struct nvmem_config *config)
static inline const struct attribute_group **nvmem_sysfs_get_groups(void)
{
return NULL;
}