param: Fix duplicate module prefixes
Instead of insisting each new module_param sysfs entry is unique, handle the case where it already exists (for builtin modules). The current code assumes that all identical prefixes are together in the section: true for normal uses, but not necessarily so if someone overrides MODULE_PARAM_PREFIX. More importantly, it's not true with the new "core_param()" code which uses "kernel" as a prefix. This simplifies the caller for the builtin case, at a slight loss of efficiency (we do the lookup every time to see if the directory exists). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Rusty Russell
parent
730b69d225
commit
9b473de872
2 changed files with 141 additions and 120 deletions
|
|
@ -60,6 +60,7 @@ struct module_kobject
|
|||
struct kobject kobj;
|
||||
struct module *mod;
|
||||
struct kobject *drivers_dir;
|
||||
struct module_param_attrs *mp;
|
||||
};
|
||||
|
||||
/* These are either module local, or the kernel's dummy ones. */
|
||||
|
|
@ -242,7 +243,6 @@ struct module
|
|||
|
||||
/* Sysfs stuff. */
|
||||
struct module_kobject mkobj;
|
||||
struct module_param_attrs *param_attrs;
|
||||
struct module_attribute *modinfo_attrs;
|
||||
const char *version;
|
||||
const char *srcversion;
|
||||
|
|
|
|||
233
kernel/params.c
233
kernel/params.c
|
|
@ -373,6 +373,8 @@ int param_get_string(char *buffer, struct kernel_param *kp)
|
|||
}
|
||||
|
||||
/* sysfs output in /sys/modules/XYZ/parameters/ */
|
||||
#define to_module_attr(n) container_of(n, struct module_attribute, attr);
|
||||
#define to_module_kobject(n) container_of(n, struct module_kobject, kobj);
|
||||
|
||||
extern struct kernel_param __start___param[], __stop___param[];
|
||||
|
||||
|
|
@ -384,6 +386,7 @@ struct param_attribute
|
|||
|
||||
struct module_param_attrs
|
||||
{
|
||||
unsigned int num;
|
||||
struct attribute_group grp;
|
||||
struct param_attribute attrs[0];
|
||||
};
|
||||
|
|
@ -434,69 +437,84 @@ static ssize_t param_attr_store(struct module_attribute *mattr,
|
|||
|
||||
#ifdef CONFIG_SYSFS
|
||||
/*
|
||||
* param_sysfs_setup - setup sysfs support for one module or KBUILD_MODNAME
|
||||
* @mk: struct module_kobject (contains parent kobject)
|
||||
* @kparam: array of struct kernel_param, the actual parameter definitions
|
||||
* @num_params: number of entries in array
|
||||
* @name_skip: offset where the parameter name start in kparam[].name. Needed for built-in "modules"
|
||||
* add_sysfs_param - add a parameter to sysfs
|
||||
* @mk: struct module_kobject
|
||||
* @kparam: the actual parameter definition to add to sysfs
|
||||
* @name: name of parameter
|
||||
*
|
||||
* Create a kobject for a (per-module) group of parameters, and create files
|
||||
* in sysfs. A pointer to the param_kobject is returned on success,
|
||||
* NULL if there's no parameter to export, or other ERR_PTR(err).
|
||||
* Create a kobject if for a (per-module) parameter if mp NULL, and
|
||||
* create file in sysfs. Returns an error on out of memory. Always cleans up
|
||||
* if there's an error.
|
||||
*/
|
||||
static __modinit struct module_param_attrs *
|
||||
param_sysfs_setup(struct module_kobject *mk,
|
||||
struct kernel_param *kparam,
|
||||
unsigned int num_params,
|
||||
unsigned int name_skip)
|
||||
static __modinit int add_sysfs_param(struct module_kobject *mk,
|
||||
struct kernel_param *kp,
|
||||
const char *name)
|
||||
{
|
||||
struct module_param_attrs *mp;
|
||||
unsigned int valid_attrs = 0;
|
||||
unsigned int i, size[2];
|
||||
struct param_attribute *pattr;
|
||||
struct attribute **gattr;
|
||||
int err;
|
||||
struct module_param_attrs *new;
|
||||
struct attribute **attrs;
|
||||
int err, num;
|
||||
|
||||
for (i=0; i<num_params; i++) {
|
||||
if (kparam[i].perm)
|
||||
valid_attrs++;
|
||||
/* We don't bother calling this with invisible parameters. */
|
||||
BUG_ON(!kp->perm);
|
||||
|
||||
if (!mk->mp) {
|
||||
num = 0;
|
||||
attrs = NULL;
|
||||
} else {
|
||||
num = mk->mp->num;
|
||||
attrs = mk->mp->grp.attrs;
|
||||
}
|
||||
|
||||
if (!valid_attrs)
|
||||
return NULL;
|
||||
|
||||
size[0] = ALIGN(sizeof(*mp) +
|
||||
valid_attrs * sizeof(mp->attrs[0]),
|
||||
sizeof(mp->grp.attrs[0]));
|
||||
size[1] = (valid_attrs + 1) * sizeof(mp->grp.attrs[0]);
|
||||
|
||||
mp = kzalloc(size[0] + size[1], GFP_KERNEL);
|
||||
if (!mp)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
mp->grp.name = "parameters";
|
||||
mp->grp.attrs = (void *)mp + size[0];
|
||||
|
||||
pattr = &mp->attrs[0];
|
||||
gattr = &mp->grp.attrs[0];
|
||||
for (i = 0; i < num_params; i++) {
|
||||
struct kernel_param *kp = &kparam[i];
|
||||
if (kp->perm) {
|
||||
pattr->param = kp;
|
||||
pattr->mattr.show = param_attr_show;
|
||||
pattr->mattr.store = param_attr_store;
|
||||
pattr->mattr.attr.name = (char *)&kp->name[name_skip];
|
||||
pattr->mattr.attr.mode = kp->perm;
|
||||
*(gattr++) = &(pattr++)->mattr.attr;
|
||||
/* Enlarge. */
|
||||
new = krealloc(mk->mp,
|
||||
sizeof(*mk->mp) + sizeof(mk->mp->attrs[0]) * (num+1),
|
||||
GFP_KERNEL);
|
||||
if (!new) {
|
||||
kfree(mk->mp);
|
||||
err = -ENOMEM;
|
||||
goto fail;
|
||||
}
|
||||
attrs = krealloc(attrs, sizeof(new->grp.attrs[0])*(num+2), GFP_KERNEL);
|
||||
if (!attrs) {
|
||||
err = -ENOMEM;
|
||||
goto fail_free_new;
|
||||
}
|
||||
*gattr = NULL;
|
||||
|
||||
if ((err = sysfs_create_group(&mk->kobj, &mp->grp))) {
|
||||
kfree(mp);
|
||||
return ERR_PTR(err);
|
||||
}
|
||||
return mp;
|
||||
/* Sysfs wants everything zeroed. */
|
||||
memset(new, 0, sizeof(*new));
|
||||
memset(&new->attrs[num], 0, sizeof(new->attrs[num]));
|
||||
memset(&attrs[num], 0, sizeof(attrs[num]));
|
||||
new->grp.name = "parameters";
|
||||
new->grp.attrs = attrs;
|
||||
|
||||
/* Tack new one on the end. */
|
||||
new->attrs[num].param = kp;
|
||||
new->attrs[num].mattr.show = param_attr_show;
|
||||
new->attrs[num].mattr.store = param_attr_store;
|
||||
new->attrs[num].mattr.attr.name = (char *)name;
|
||||
new->attrs[num].mattr.attr.mode = kp->perm;
|
||||
new->num = num+1;
|
||||
|
||||
/* Fix up all the pointers, since krealloc can move us */
|
||||
for (num = 0; num < new->num; num++)
|
||||
new->grp.attrs[num] = &new->attrs[num].mattr.attr;
|
||||
new->grp.attrs[num] = NULL;
|
||||
|
||||
mk->mp = new;
|
||||
return 0;
|
||||
|
||||
fail_free_new:
|
||||
kfree(new);
|
||||
fail:
|
||||
mk->mp = NULL;
|
||||
return err;
|
||||
}
|
||||
|
||||
static void free_module_param_attrs(struct module_kobject *mk)
|
||||
{
|
||||
kfree(mk->mp->grp.attrs);
|
||||
kfree(mk->mp);
|
||||
mk->mp = NULL;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_MODULES
|
||||
|
|
@ -506,21 +524,33 @@ param_sysfs_setup(struct module_kobject *mk,
|
|||
* @kparam: module parameters (array)
|
||||
* @num_params: number of module parameters
|
||||
*
|
||||
* Adds sysfs entries for module parameters, and creates a link from
|
||||
* /sys/module/[mod->name]/parameters to /sys/parameters/[mod->name]/
|
||||
* Adds sysfs entries for module parameters under
|
||||
* /sys/module/[mod->name]/parameters/
|
||||
*/
|
||||
int module_param_sysfs_setup(struct module *mod,
|
||||
struct kernel_param *kparam,
|
||||
unsigned int num_params)
|
||||
{
|
||||
struct module_param_attrs *mp;
|
||||
int i, err;
|
||||
bool params = false;
|
||||
|
||||
mp = param_sysfs_setup(&mod->mkobj, kparam, num_params, 0);
|
||||
if (IS_ERR(mp))
|
||||
return PTR_ERR(mp);
|
||||
for (i = 0; i < num_params; i++) {
|
||||
if (kparam[i].perm == 0)
|
||||
continue;
|
||||
err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name);
|
||||
if (err)
|
||||
return err;
|
||||
params = true;
|
||||
}
|
||||
|
||||
mod->param_attrs = mp;
|
||||
if (!params)
|
||||
return 0;
|
||||
|
||||
/* Create the param group. */
|
||||
err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp);
|
||||
if (err)
|
||||
free_module_param_attrs(&mod->mkobj);
|
||||
return err;
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -532,43 +562,55 @@ int module_param_sysfs_setup(struct module *mod,
|
|||
*/
|
||||
void module_param_sysfs_remove(struct module *mod)
|
||||
{
|
||||
if (mod->param_attrs) {
|
||||
sysfs_remove_group(&mod->mkobj.kobj,
|
||||
&mod->param_attrs->grp);
|
||||
if (mod->mkobj.mp) {
|
||||
sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp);
|
||||
/* We are positive that no one is using any param
|
||||
* attrs at this point. Deallocate immediately. */
|
||||
kfree(mod->param_attrs);
|
||||
mod->param_attrs = NULL;
|
||||
free_module_param_attrs(&mod->mkobj);
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
* kernel_param_sysfs_setup - wrapper for built-in params support
|
||||
*/
|
||||
static void __init kernel_param_sysfs_setup(const char *name,
|
||||
static void __init kernel_add_sysfs_param(const char *name,
|
||||
struct kernel_param *kparam,
|
||||
unsigned int num_params,
|
||||
unsigned int name_skip)
|
||||
{
|
||||
struct module_kobject *mk;
|
||||
int ret;
|
||||
struct kobject *kobj;
|
||||
int err;
|
||||
|
||||
kobj = kset_find_obj(module_kset, name);
|
||||
if (kobj) {
|
||||
/* We already have one. Remove params so we can add more. */
|
||||
mk = to_module_kobject(kobj);
|
||||
/* We need to remove it before adding parameters. */
|
||||
sysfs_remove_group(&mk->kobj, &mk->mp->grp);
|
||||
} else {
|
||||
mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL);
|
||||
BUG_ON(!mk);
|
||||
|
||||
mk->mod = THIS_MODULE;
|
||||
mk->kobj.kset = module_kset;
|
||||
ret = kobject_init_and_add(&mk->kobj, &module_ktype, NULL, "%s", name);
|
||||
if (ret) {
|
||||
err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL,
|
||||
"%s", name);
|
||||
if (err) {
|
||||
kobject_put(&mk->kobj);
|
||||
printk(KERN_ERR "Module '%s' failed to be added to sysfs, "
|
||||
"error number %d\n", name, ret);
|
||||
printk(KERN_ERR "Module '%s' failed add to sysfs, "
|
||||
"error number %d\n", name, err);
|
||||
printk(KERN_ERR "The system will be unstable now.\n");
|
||||
return;
|
||||
}
|
||||
param_sysfs_setup(mk, kparam, num_params, name_skip);
|
||||
/* So that exit path is even. */
|
||||
kobject_get(&mk->kobj);
|
||||
}
|
||||
|
||||
/* These should not fail at boot. */
|
||||
err = add_sysfs_param(mk, kparam, kparam->name + name_skip);
|
||||
BUG_ON(err);
|
||||
err = sysfs_create_group(&mk->kobj, &mk->mp->grp);
|
||||
BUG_ON(err);
|
||||
kobject_uevent(&mk->kobj, KOBJ_ADD);
|
||||
kobject_put(&mk->kobj);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -579,18 +621,19 @@ static void __init kernel_param_sysfs_setup(const char *name,
|
|||
* The "module" name (KBUILD_MODNAME) is stored before a dot, the
|
||||
* "parameter" name is stored behind a dot in kernel_param->name. So,
|
||||
* extract the "module" name for all built-in kernel_param-eters,
|
||||
* and for all who have the same, call kernel_param_sysfs_setup.
|
||||
* and for all who have the same, call kernel_add_sysfs_param.
|
||||
*/
|
||||
static void __init param_sysfs_builtin(void)
|
||||
{
|
||||
struct kernel_param *kp, *kp_begin = NULL;
|
||||
unsigned int i, name_len, count = 0;
|
||||
char modname[MODULE_NAME_LEN] = "";
|
||||
struct kernel_param *kp;
|
||||
unsigned int name_len;
|
||||
char modname[MODULE_NAME_LEN];
|
||||
|
||||
for (i=0; i < __stop___param - __start___param; i++) {
|
||||
for (kp = __start___param; kp < __stop___param; kp++) {
|
||||
char *dot;
|
||||
|
||||
kp = &__start___param[i];
|
||||
if (kp->perm == 0)
|
||||
continue;
|
||||
|
||||
dot = strchr(kp->name, '.');
|
||||
if (!dot) {
|
||||
|
|
@ -599,37 +642,15 @@ static void __init param_sysfs_builtin(void)
|
|||
continue;
|
||||
}
|
||||
name_len = dot - kp->name;
|
||||
|
||||
/* new kbuild_modname? */
|
||||
if (strlen(modname) != name_len
|
||||
|| strncmp(modname, kp->name, name_len) != 0) {
|
||||
/* add a new kobject for previous kernel_params. */
|
||||
if (count)
|
||||
kernel_param_sysfs_setup(modname,
|
||||
kp_begin,
|
||||
count,
|
||||
strlen(modname)+1);
|
||||
|
||||
strncpy(modname, kp->name, name_len);
|
||||
modname[name_len] = '\0';
|
||||
count = 0;
|
||||
kp_begin = kp;
|
||||
kernel_add_sysfs_param(modname, kp, name_len+1);
|
||||
}
|
||||
count++;
|
||||
}
|
||||
|
||||
/* last kernel_params need to be registered as well */
|
||||
if (count)
|
||||
kernel_param_sysfs_setup(modname, kp_begin, count,
|
||||
strlen(modname)+1);
|
||||
}
|
||||
|
||||
|
||||
/* module-related sysfs stuff */
|
||||
|
||||
#define to_module_attr(n) container_of(n, struct module_attribute, attr);
|
||||
#define to_module_kobject(n) container_of(n, struct module_kobject, kobj);
|
||||
|
||||
static ssize_t module_attr_show(struct kobject *kobj,
|
||||
struct attribute *attr,
|
||||
char *buf)
|
||||
|
|
|
|||
Loading…
Reference in a new issue