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iwlwifi: mvm: fix regulatory domain update when the firmware starts 

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>
This commit is contained in:
Emmanuel Grumbach 2018-10-03 11:16:54 +03:00 committed by Luca Coelho
parent ec484d03ef
commit 82715ac71e
2 changed files with 8 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
View File

@ -301,8 +301,12 @@ struct ieee80211_regdomain *iwl_mvm_get_regdomain(struct wiphy *wiphy,
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),

5
drivers/net/wireless/intel/iwlwifi/mvm/nvm.c
View File

@ -539,9 +539,8 @@ iwl_mvm_update_mcc(struct iwl_mvm *mvm, const char *alpha2,
}
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);
exit:
iwl_free_resp(&cmd);