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cfg80211: Stop calling crda if it is not responsive 

Patch eeca9fce1d (cfg80211: Schedule
timeout for all CRDA call) introduced a regression, where in case
that crda is not installed (or not configured properly etc.), the
regulatory core will needlessly continue to call it, polluting the
log with the following log:

"cfg80211: Calling CRDA to update world regulatory domain"

Fix this by limiting the number of continuous CRDA request failures.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Ilan peer 2015-03-30 15:15:49 +03:00 committed by Johannes Berg
parent 7bedd0cfad
commit c37722bd19
3 changed files with 38 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
net/wireless/nl80211.c
View File

@ -5664,7 +5664,7 @@ static int nl80211_set_reg(struct sk_buff *skb, struct genl_info *info)
}
}
r = set_regdom(rd);
r = set_regdom(rd, REGD_SOURCE_CRDA);
/* set_regdom took ownership */
rd = NULL;

34
net/wireless/reg.c
View File

@ -135,6 +135,11 @@ static spinlock_t reg_indoor_lock;
/* Used to track the userspace process controlling the indoor setting */
static u32 reg_is_indoor_portid;
/* Max number of consecutive attempts to communicate with CRDA */
#define REG_MAX_CRDA_TIMEOUTS 10
static u32 reg_crda_timeouts;
static const struct ieee80211_regdomain *get_cfg80211_regdom(void)
{
return rtnl_dereference(cfg80211_regdomain);
@ -485,7 +490,7 @@ static void reg_regdb_search(struct work_struct *work)
mutex_unlock(&reg_regdb_search_mutex);
if (!IS_ERR_OR_NULL(regdom))
set_regdom(regdom);
set_regdom(regdom, REGD_SOURCE_INTERNAL_DB);
rtnl_unlock();
}
@ -535,15 +540,20 @@ static int call_crda(const char *alpha2)
snprintf(country, sizeof(country), "COUNTRY=%c%c",
alpha2[0], alpha2[1]);
/* query internal regulatory database (if it exists) */
reg_regdb_query(alpha2);
if (reg_crda_timeouts > REG_MAX_CRDA_TIMEOUTS) {
pr_info("Exceeded CRDA call max attempts. Not calling CRDA\n");
return -EINVAL;
}
if (!is_world_regdom((char *) alpha2))
pr_info("Calling CRDA for country: %c%c\n",
alpha2[0], alpha2[1]);
else
pr_info("Calling CRDA to update world regulatory domain\n");
/* query internal regulatory database (if it exists) */
reg_regdb_query(alpha2);
return kobject_uevent_env(&reg_pdev->dev.kobj, KOBJ_CHANGE, env);
}
@ -2293,6 +2303,9 @@ int regulatory_hint_user(const char *alpha2,
request->initiator = NL80211_REGDOM_SET_BY_USER;
request->user_reg_hint_type = user_reg_hint_type;
/* Allow calling CRDA again */
reg_crda_timeouts = 0;
queue_regulatory_request(request);
return 0;
@ -2362,6 +2375,9 @@ int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
request->alpha2[1] = alpha2[1];
request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
/* Allow calling CRDA again */
reg_crda_timeouts = 0;
queue_regulatory_request(request);
return 0;
@ -2415,6 +2431,9 @@ void regulatory_hint_country_ie(struct wiphy *wiphy, enum ieee80211_band band,
request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
request->country_ie_env = env;
/* Allow calling CRDA again */
reg_crda_timeouts = 0;
queue_regulatory_request(request);
request = NULL;
out:
@ -2893,7 +2912,8 @@ static int reg_set_rd_country_ie(const struct ieee80211_regdomain *rd,
* multiple drivers can be ironed out later. Caller must've already
* kmalloc'd the rd structure.
*/
int set_regdom(const struct ieee80211_regdomain *rd)
int set_regdom(const struct ieee80211_regdomain *rd,
enum ieee80211_regd_source regd_src)
{
struct regulatory_request *lr;
bool user_reset = false;
@ -2904,6 +2924,9 @@ int set_regdom(const struct ieee80211_regdomain *rd)
return -EINVAL;
}
if (regd_src == REGD_SOURCE_CRDA)
reg_crda_timeouts = 0;
lr = get_last_request();
/* Note that this doesn't update the wiphys, this is done below */
@ -3063,6 +3086,7 @@ static void reg_timeout_work(struct work_struct *work)
{
REG_DBG_PRINT("Timeout while waiting for CRDA to reply, restoring regulatory settings\n");
rtnl_lock();
reg_crda_timeouts++;
restore_regulatory_settings(true);
rtnl_unlock();
}

9
net/wireless/reg.h
View File

@ -16,6 +16,11 @@
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
enum ieee80211_regd_source {
REGD_SOURCE_INTERNAL_DB,
REGD_SOURCE_CRDA,
};
extern const struct ieee80211_regdomain __rcu *cfg80211_regdomain;
bool reg_is_valid_request(const char *alpha2);
@ -46,7 +51,9 @@ void wiphy_regulatory_deregister(struct wiphy *wiphy);
int __init regulatory_init(void);
void regulatory_exit(void);
int set_regdom(const struct ieee80211_regdomain *rd);
int set_regdom(const struct ieee80211_regdomain *rd,
enum ieee80211_regd_source regd_src);
unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain *rd,
const struct ieee80211_reg_rule *rule);