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OpenCloudOS-Kernel
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Driver core: make uevent-environment available in uevent-file 

This allows sysfs to show the environment variables that are available
if the uevent happens.  This lets userspace not have to cache all of
this information as the kernel already knows it.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Kay Sievers 2007-04-06 01:40:38 +02:00 committed by Greg Kroah-Hartman
parent 4628803062
commit 16574dccd8
1 changed files with 49 additions and 1 deletions
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50
drivers/base/core.c
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@ -246,6 +246,53 @@ static struct kset_uevent_ops device_uevent_ops = {
.uevent = dev_uevent,
};
static ssize_t show_uevent(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct kobject *top_kobj;
struct kset *kset;
char *envp[32];
char data[PAGE_SIZE];
char *pos;
int i;
size_t count = 0;
int retval;
/* search the kset, the device belongs to */
top_kobj = &dev->kobj;
if (!top_kobj->kset && top_kobj->parent) {
do {
top_kobj = top_kobj->parent;
} while (!top_kobj->kset && top_kobj->parent);
}
if (!top_kobj->kset)
goto out;
kset = top_kobj->kset;
if (!kset->uevent_ops || !kset->uevent_ops->uevent)
goto out;
/* respect filter */
if (kset->uevent_ops && kset->uevent_ops->filter)
if (!kset->uevent_ops->filter(kset, &dev->kobj))
goto out;
/* let the kset specific function add its keys */
pos = data;
retval = kset->uevent_ops->uevent(kset, &dev->kobj,
envp, ARRAY_SIZE(envp),
pos, PAGE_SIZE);
if (retval)
goto out;
/* copy keys to file */
for (i = 0; envp[i]; i++) {
pos = &buf[count];
count += sprintf(pos, "%s\n", envp[i]);
}
out:
return count;
}
static ssize_t store_uevent(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
@ -621,10 +668,11 @@ int device_add(struct device *dev)
BUS_NOTIFY_ADD_DEVICE, dev);
dev->uevent_attr.attr.name = "uevent";
dev->uevent_attr.attr.mode = S_IWUSR;
dev->uevent_attr.attr.mode = S_IRUGO | S_IWUSR;
if (dev->driver)
dev->uevent_attr.attr.owner = dev->driver->owner;
dev->uevent_attr.store = store_uevent;
dev->uevent_attr.show = show_uevent;
error = device_create_file(dev, &dev->uevent_attr);
if (error)
goto attrError;