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net/wireless: add COUNTRY to to regulatory device uevent 

Regulatory devices issue change uevents to inform userspace of a need
to call the crda tool; however these can often be sent before udevd is
running, and were not previously included in the results of
udevadm trigger (which requests a new change event using the /uevent
attribute of the sysfs object).

Add a uevent function to the device type which includes the COUNTRY
information from the last request if it has yet to be processed, the
case of multiple requests is already handled in the code by checking
whether an unprocessed one is queued in the same manner and refusing
to queue a new one.

The existing udev rule continues to work as before.

Signed-off-by: Scott James Remnant <keybuk@google.com>
Acked-By: Kay Sievers <kay.sievers@vrfy.org>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Scott James Remnant 2011-03-08 10:45:30 -08:00 committed by John W. Linville
parent 80751e2b8f
commit 4d9d88d121
2 changed files with 29 additions and 11 deletions
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39
net/wireless/reg.c
View File

@ -63,6 +63,10 @@ static struct regulatory_request *last_request;
/* To trigger userspace events */
static struct platform_device *reg_pdev;
static struct device_type reg_device_type = {
.uevent = reg_device_uevent,
};
/*
* Central wireless core regulatory domains, we only need two,
* the current one and a world regulatory domain in case we have no
@ -362,16 +366,11 @@ static inline void reg_regdb_query(const char *alpha2) {}
/*
* This lets us keep regulatory code which is updated on a regulatory
* basis in userspace.
* basis in userspace. Country information is filled in by
* reg_device_uevent
*/
static int call_crda(const char *alpha2)
{
char country_env[9 + 2] = "COUNTRY=";
char *envp[] = {
country_env,
NULL
};
if (!is_world_regdom((char *) alpha2))
pr_info("Calling CRDA for country: %c%c\n",
alpha2[0], alpha2[1]);
@ -381,10 +380,7 @@ static int call_crda(const char *alpha2)
/* query internal regulatory database (if it exists) */
reg_regdb_query(alpha2);
country_env[8] = alpha2[0];
country_env[9] = alpha2[1];
return kobject_uevent_env(&reg_pdev->dev.kobj, KOBJ_CHANGE, envp);
return kobject_uevent(&reg_pdev->dev.kobj, KOBJ_CHANGE);
}
/* Used by nl80211 before kmalloc'ing our regulatory domain */
@ -2087,6 +2083,25 @@ int set_regdom(const struct ieee80211_regdomain *rd)
return r;
}
#ifdef CONFIG_HOTPLUG
int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
{
if (last_request && !last_request->processed) {
if (add_uevent_var(env, "COUNTRY=%c%c",
last_request->alpha2[0],
last_request->alpha2[1]))
return -ENOMEM;
}
return 0;
}
#else
int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
{
return -ENODEV;
}
#endif /* CONFIG_HOTPLUG */
/* Caller must hold cfg80211_mutex */
void reg_device_remove(struct wiphy *wiphy)
{
@ -2118,6 +2133,8 @@ int __init regulatory_init(void)
if (IS_ERR(reg_pdev))
return PTR_ERR(reg_pdev);
reg_pdev->dev.type = &reg_device_type;
spin_lock_init(&reg_requests_lock);
spin_lock_init(&reg_pending_beacons_lock);

1
net/wireless/reg.h
View File

@ -8,6 +8,7 @@ bool reg_is_valid_request(const char *alpha2);
int regulatory_hint_user(const char *alpha2);
int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env);
void reg_device_remove(struct wiphy *wiphy);
int __init regulatory_init(void);