From: Jérôme Pouiller <jerome.pouiller@xxxxxxxxxx>
wfx_remove_interface() and wfx_configure_filter() can be run
concurrently. Therefore, this patch protect access to the list of
interfaces from wfx_configure_filter().
Notice that wfx_configure_filter() now lock "conf_lock" and "scan_lock".
Beside that, wfx_hw_scan_work() also access to the same locks. So we
have to lock them in same order to avoid any deadlock.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@xxxxxxxxxx>
---
drivers/staging/wfx/scan.c | 4 ++--
drivers/staging/wfx/sta.c | 2 ++
2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/wfx/scan.c b/drivers/staging/wfx/scan.c
index 6e1e50048651..0c7f4eef045c 100644
--- a/drivers/staging/wfx/scan.c
+++ b/drivers/staging/wfx/scan.c
@@ -86,8 +86,8 @@ void wfx_hw_scan_work(struct work_struct *work)
struct ieee80211_scan_request *hw_req = wvif->scan_req;
int chan_cur, ret;
- mutex_lock(&wvif->scan_lock);
mutex_lock(&wvif->wdev->conf_mutex);
+ mutex_lock(&wvif->scan_lock);
update_probe_tmpl(wvif, &hw_req->req);
wfx_fwd_probe_req(wvif, true);
chan_cur = 0;
@@ -96,8 +96,8 @@ void wfx_hw_scan_work(struct work_struct *work)
if (ret > 0)
chan_cur += ret;
} while (ret > 0 && chan_cur < hw_req->req.n_channels);
- mutex_unlock(&wvif->wdev->conf_mutex);
mutex_unlock(&wvif->scan_lock);
+ mutex_unlock(&wvif->wdev->conf_mutex);
__ieee80211_scan_completed_compat(wvif->wdev->hw, ret < 0);
}
diff --git a/drivers/staging/wfx/sta.c b/drivers/staging/wfx/sta.c
index 4d5dbfc24f52..380e5319472a 100644
--- a/drivers/staging/wfx/sta.c
+++ b/drivers/staging/wfx/sta.c
@@ -242,6 +242,7 @@ void wfx_configure_filter(struct ieee80211_hw *hw,
*total_flags &= FIF_OTHER_BSS | FIF_FCSFAIL | FIF_PROBE_REQ;
+ mutex_lock(&wdev->conf_mutex);
while ((wvif = wvif_iterate(wdev, wvif)) != NULL) {
mutex_lock(&wvif->scan_lock);
wvif->filter_bssid = (*total_flags &
@@ -251,6 +252,7 @@ void wfx_configure_filter(struct ieee80211_hw *hw,
wfx_update_filtering(wvif);
mutex_unlock(&wvif->scan_lock);
}
+ mutex_unlock(&wdev->conf_mutex);
}
static int wfx_update_pm(struct wfx_vif *wvif)
--
2.25.1
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