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wil6210: abort P2P search when stopping P2P device

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The nl80211 layer expects P2P search operation to be aborted
if needed when stopping P2P device. If the P2P search operation
is still running after returning from stop_p2p_device
it causes a WARN_ON and possibly a kernel crash.
Fix this by aborting the P2P search in wil_cfg80211_stop_p2p_device
and preventing P2P search from being started on a stopped P2P
device.
Note, the fix does not cover the case where a regular scan
is started on the P2P device. It will be completed in the
future when support is added for aborting a scan operation.

Signed-off-by: Lior David <qca_liord@qca.qualcomm.com>
Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
This commit is contained in:
Lior David 2016-06-08 20:07:48 +03:00 committed by Kalle Valo
parent 9c830abe91
commit eb57a5b387
2 changed files with 17 additions and 0 deletions
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16
drivers/net/wireless/ath/wil6210/cfg80211.c
View File

@ -378,6 +378,10 @@ static int wil_cfg80211_scan(struct wiphy *wiphy,
/* social scan on P2P_DEVICE is handled as p2p search */
if (wdev->iftype == NL80211_IFTYPE_P2P_DEVICE &&
wil_p2p_is_social_scan(request)) {
if (!wil->p2p.p2p_dev_started) {
wil_err(wil, "P2P search requested on stopped P2P device\n");
return -EIO;
}
wil->scan_request = request;
wil->radio_wdev = wdev;
rc = wil_p2p_search(wil, request);
@ -1351,6 +1355,7 @@ static int wil_cfg80211_start_p2p_device(struct wiphy *wiphy,
struct wil6210_priv *wil = wiphy_to_wil(wiphy);
wil_dbg_misc(wil, "%s: entered\n", __func__);
wil->p2p.p2p_dev_started = 1;
return 0;
}
@ -1358,8 +1363,19 @@ static void wil_cfg80211_stop_p2p_device(struct wiphy *wiphy,
struct wireless_dev *wdev)
{
struct wil6210_priv *wil = wiphy_to_wil(wiphy);
u8 started;
wil_dbg_misc(wil, "%s: entered\n", __func__);
mutex_lock(&wil->mutex);
started = wil_p2p_stop_discovery(wil);
if (started && wil->scan_request) {
cfg80211_scan_done(wil->scan_request, 1);
wil->scan_request = NULL;
wil->radio_wdev = wil->wdev;
}
mutex_unlock(&wil->mutex);
wil->p2p.p2p_dev_started = 0;
}
static struct cfg80211_ops wil_cfg80211_ops = {

1
drivers/net/wireless/ath/wil6210/wil6210.h
View File

@ -458,6 +458,7 @@ struct wil_tid_crypto_rx {
struct wil_p2p_info {
struct ieee80211_channel listen_chan;
u8 discovery_started;
u8 p2p_dev_started;
u64 cookie;
struct timer_list discovery_timer; /* listen/search duration */
struct work_struct discovery_expired_work; /* listen/search expire */