4.4-stable review patch. If anyone has any objections, please let me know.
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From: Emmanuel Grumbach emmanuel.grumbach@intel.com
commit 82715ac71e6b94a2c2136e31f3a8e6748e33aa8c upstream.
When the firmware starts, it doesn't have any regulatory information, hence it uses the world wide limitations. The driver can feed the firmware with previous knowledge that was kept in the driver, but the firmware may still not update its internal tables.
This happens when we start a BSS interface, and then the firmware can change the regulatory tables based on our location and it'll use more lenient, location specific rules. Then, if the firmware is shut down (when the interface is brought down), and then an AP interface is created, the firmware will forget the country specific rules.
The host will think that we are in a certain country that may allow channels and will try to teach the firmware about our location, but the firmware may still not allow to drop the world wide limitations and apply country specific rules because it was just re-started.
In this case, the firmware will reply with MCC_RESP_ILLEGAL to the MCC_UPDATE_CMD. In that case, iwlwifi needs to let the upper layers (cfg80211 / hostapd) know that the channel list they know about has been updated.
This fixes https://bugzilla.kernel.org/show_bug.cgi?id=201105
Cc: stable@vger.kernel.org Signed-off-by: Emmanuel Grumbach emmanuel.grumbach@intel.com Signed-off-by: Luca Coelho luciano.coelho@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/net/wireless/iwlwifi/mvm/mac80211.c | 8 ++++++-- drivers/net/wireless/iwlwifi/mvm/nvm.c | 5 ++--- 2 files changed, 8 insertions(+), 5 deletions(-)
--- a/drivers/net/wireless/iwlwifi/mvm/mac80211.c +++ b/drivers/net/wireless/iwlwifi/mvm/mac80211.c @@ -322,8 +322,12 @@ struct ieee80211_regdomain *iwl_mvm_get_ goto out; }
- if (changed) - *changed = (resp->status == MCC_RESP_NEW_CHAN_PROFILE); + if (changed) { + u32 status = le32_to_cpu(resp->status); + + *changed = (status == MCC_RESP_NEW_CHAN_PROFILE || + status == MCC_RESP_ILLEGAL); + }
regd = iwl_parse_nvm_mcc_info(mvm->trans->dev, mvm->cfg, __le32_to_cpu(resp->n_channels), --- a/drivers/net/wireless/iwlwifi/mvm/nvm.c +++ b/drivers/net/wireless/iwlwifi/mvm/nvm.c @@ -667,9 +667,8 @@ iwl_mvm_update_mcc(struct iwl_mvm *mvm,
n_channels = __le32_to_cpu(mcc_resp->n_channels); IWL_DEBUG_LAR(mvm, - "MCC response status: 0x%x. new MCC: 0x%x ('%c%c') change: %d n_chans: %d\n", - status, mcc, mcc >> 8, mcc & 0xff, - !!(status == MCC_RESP_NEW_CHAN_PROFILE), n_channels); + "MCC response status: 0x%x. new MCC: 0x%x ('%c%c') n_chans: %d\n", + status, mcc, mcc >> 8, mcc & 0xff, n_channels);
resp_len = sizeof(*mcc_resp) + n_channels * sizeof(__le32); resp_cp = kmemdup(mcc_resp, resp_len, GFP_KERNEL);