Commit 34bcf715 authored by Stanislaw Gruszka's avatar Stanislaw Gruszka Committed by Johannes Berg
Browse files

mac80211: fix ibss scanning 

Do not scan on no-IBSS and disabled channels in IBSS mode. Doing this
can trigger Microcode errors on iwlwifi and iwlegacy drivers.

Also rename ieee80211_request_internal_scan() function since it is only
used in IBSS mode and simplify calling it from ieee80211_sta_find_ibss().

This patch should address:
https://bugzilla.redhat.com/show_bug.cgi?id=883414
https://bugzilla.kernel.org/show_bug.cgi?id=49411



Reported-by: default avatarJesse Kahtava <jesse_kahtava@f-m.fm>
Reported-by: default avatarMikko Rapeli <mikko.rapeli@iki.fi>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarStanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent a49f0d1e

net/mac80211/ibss.c

+4 −5
Original line number Diff line number Diff line
@@ -703,8 +703,8 @@ static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 
	sdata_info(sdata,

		   "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");



	ieee80211_request_internal_scan(sdata,

			ifibss->ssid, ifibss->ssid_len, NULL);

	ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,

				    NULL);

}



static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
@@ -802,9 +802,8 @@ static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 
					IEEE80211_SCAN_INTERVAL)) {

		sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");



		ieee80211_request_internal_scan(sdata,

				ifibss->ssid, ifibss->ssid_len,

				ifibss->fixed_channel ? ifibss->channel : NULL);

		ieee80211_request_ibss_scan(sdata, ifibss->ssid,

					    ifibss->ssid_len, chan);

	} else {

		int interval = IEEE80211_SCAN_INTERVAL;

net/mac80211/ieee80211_i.h

+3 −3
Original line number Diff line number Diff line
@@ -1329,7 +1329,7 @@ void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 


/* scan/BSS handling */

void ieee80211_scan_work(struct work_struct *work);

int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata,

int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,

				const u8 *ssid, u8 ssid_len,

				struct ieee80211_channel *chan);

int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,

net/mac80211/scan.c

+24 −10
Original line number Diff line number Diff line
@@ -832,7 +832,7 @@ int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 
	return res;

}



int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata,

int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,

				const u8 *ssid, u8 ssid_len,

				struct ieee80211_channel *chan)

{
@@ -848,22 +848,36 @@ int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata, 


	/* fill internal scan request */

	if (!chan) {

		int i, nchan = 0;

		int i, max_n;

		int n_ch = 0;



		for (band = 0; band < IEEE80211_NUM_BANDS; band++) {

			if (!local->hw.wiphy->bands[band])

				continue;

			for (i = 0;

			     i < local->hw.wiphy->bands[band]->n_channels;

			     i++) {

				local->int_scan_req->channels[nchan] =



			max_n = local->hw.wiphy->bands[band]->n_channels;

			for (i = 0; i < max_n; i++) {

				struct ieee80211_channel *tmp_ch =

				    &local->hw.wiphy->bands[band]->channels[i];

				nchan++;



				if (tmp_ch->flags & (IEEE80211_CHAN_NO_IBSS |

						     IEEE80211_CHAN_DISABLED))

					continue;



				local->int_scan_req->channels[n_ch] = tmp_ch;

				n_ch++;

			}

		}



		local->int_scan_req->n_channels = nchan;

		if (WARN_ON_ONCE(n_ch == 0))

			goto unlock;



		local->int_scan_req->n_channels = n_ch;

	} else {

		if (WARN_ON_ONCE(chan->flags & (IEEE80211_CHAN_NO_IBSS |

						IEEE80211_CHAN_DISABLED)))

			goto unlock;



		local->int_scan_req->channels[0] = chan;

		local->int_scan_req->n_channels = 1;

	}

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