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authorKalle Valo <kvalo@qca.qualcomm.com>2012-07-12 14:33:58 +0200
committerJohannes Berg <johannes.berg@intel.com>2012-07-17 12:00:43 +0200
commit959085352b7c44ff9bae4d8a4d76146193260e4c (patch)
tree0b868f531b1883c894e02d14640901bfb570d05d /net/wireless/reg.c
parentcfg80211: support TX error rate CQM (diff)
downloadlinux-959085352b7c44ff9bae4d8a4d76146193260e4c.tar.xz
linux-959085352b7c44ff9bae4d8a4d76146193260e4c.zip
cfg80211: fix set_regdom() to cancel requests with same alpha2
While adding regulatory support to ath6kl I noticed that I easily got the regulatory code confused. The way to reproduce the bug was: 1. iw reg set FI (in userspace) 2. cfg80211 calls ath6kl_reg_notify(FI) 3. ath6kl sets regdomain in firmware 4. firmware sends regdomain event to notify about the new regdomain (FI) 5. ath6kl calls regulatory_hint(FI) And this (from FI to FI transition) confuses cfg80211 and after that I only get "Pending regulatory request, waiting for it to be processed...." messages and regdomain changes won't work anymore. The reason why ath6kl calls regulatory_hint() is that firmware can change the regulatory domain by it's own, for example due to 11d IEs. I could of course workaround this in ath6kl but I think it's better to handle the case in cfg80211. The fix is pretty simple, use a different error code if the regdomain is same and then just set the request processed so that it doesn't block new requests. Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless/reg.c')
-rw-r--r--net/wireless/reg.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index b2b32229b607..ad6f9029c564 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -2128,7 +2128,7 @@ static int __set_regdom(const struct ieee80211_regdomain *rd)
* checking if the alpha2 changes if CRDA was already called
*/
if (!regdom_changes(rd->alpha2))
- return -EINVAL;
+ return -EALREADY;
}
/*
@@ -2248,6 +2248,9 @@ int set_regdom(const struct ieee80211_regdomain *rd)
/* Note that this doesn't update the wiphys, this is done below */
r = __set_regdom(rd);
if (r) {
+ if (r == -EALREADY)
+ reg_set_request_processed();
+
kfree(rd);
mutex_unlock(&reg_mutex);
return r;