From: Juuso Oikarinen <juuso.oikarinen@xxxxxxxxx>
The current scan implementation can jam, if the scan request ends up
containing no work. This can especially happen if there is a scan request
with only 11a band channels for HW that does not support 11a.
Signed-off-by: Juuso Oikarinen <juuso.oikarinen@xxxxxxxxx>
Reviewed-by: Luciano Coelho <luciano.coelho@xxxxxxxxx>
Signed-off-by: Luciano Coelho <luciano.coelho@xxxxxxxxx>
---
drivers/net/wireless/wl12xx/wl1271.h | 1 +
drivers/net/wireless/wl12xx/wl1271_main.c | 4 ++++
drivers/net/wireless/wl12xx/wl1271_scan.c | 23 ++++++++++++++++++-----
drivers/net/wireless/wl12xx/wl1271_scan.h | 1 +
4 files changed, 24 insertions(+), 5 deletions(-)
diff --git a/drivers/net/wireless/wl12xx/wl1271.h b/drivers/net/wireless/wl12xx/wl1271.h
index 9782bc1..55ec656 100644
--- a/drivers/net/wireless/wl12xx/wl1271.h
+++ b/drivers/net/wireless/wl12xx/wl1271.h
@@ -418,6 +418,7 @@ struct wl1271 {
/* Are we currently scanning */
struct wl1271_scan scan;
+ struct work_struct scan_complete_work;
/* Our association ID */
u16 aid;
diff --git a/drivers/net/wireless/wl12xx/wl1271_main.c b/drivers/net/wireless/wl12xx/wl1271_main.c
index 44915ee..37f61de 100644
--- a/drivers/net/wireless/wl12xx/wl1271_main.c
+++ b/drivers/net/wireless/wl12xx/wl1271_main.c
@@ -634,6 +634,8 @@ static int wl1271_setup(struct wl1271 *wl)
INIT_WORK(&wl->irq_work, wl1271_irq_work);
INIT_WORK(&wl->tx_work, wl1271_tx_work);
+ INIT_WORK(&wl->scan_complete_work, wl1271_scan_complete_work);
+
return 0;
}
@@ -962,6 +964,8 @@ static void wl1271_op_remove_interface(struct ieee80211_hw *hw,
struct wl1271 *wl = hw->priv;
int i;
+ cancel_work_sync(&wl->scan_complete_work);
+
mutex_lock(&wl->mutex);
wl1271_debug(DEBUG_MAC80211, "mac80211 remove interface");
diff --git a/drivers/net/wireless/wl12xx/wl1271_scan.c b/drivers/net/wireless/wl12xx/wl1271_scan.c
index 8d30150..9f1da82 100644
--- a/drivers/net/wireless/wl12xx/wl1271_scan.c
+++ b/drivers/net/wireless/wl12xx/wl1271_scan.c
@@ -28,6 +28,23 @@
#include "wl1271_scan.h"
#include "wl1271_acx.h"
+void wl1271_scan_complete_work(struct work_struct *work)
+{
+ struct wl1271 *wl =
+ container_of(work, struct wl1271, scan_complete_work);
+
+ wl1271_debug(DEBUG_SCAN, "Scanning complete");
+
+ mutex_lock(&wl->mutex);
+ wl->scan.state = WL1271_SCAN_STATE_IDLE;
+ kfree(wl->scan.scanned_ch);
+ wl->scan.scanned_ch = NULL;
+ mutex_unlock(&wl->mutex);
+
+ ieee80211_scan_completed(wl->hw, false);
+}
+
+
static int wl1271_get_scan_channels(struct wl1271 *wl,
struct cfg80211_scan_request *req,
struct basic_scan_channel_params *channels,
@@ -218,11 +235,7 @@ void wl1271_scan_stm(struct wl1271 *wl)
break;
case WL1271_SCAN_STATE_DONE:
- kfree(wl->scan.scanned_ch);
- wl->scan.scanned_ch = NULL;
-
- wl->scan.state = WL1271_SCAN_STATE_IDLE;
- ieee80211_scan_completed(wl->hw, false);
+ ieee80211_queue_work(wl->hw, &wl->scan_complete_work);
break;
default:
diff --git a/drivers/net/wireless/wl12xx/wl1271_scan.h b/drivers/net/wireless/wl12xx/wl1271_scan.h
index f181570..1404e00 100644
--- a/drivers/net/wireless/wl12xx/wl1271_scan.h
+++ b/drivers/net/wireless/wl12xx/wl1271_scan.h
@@ -32,6 +32,7 @@ int wl1271_scan_build_probe_req(struct wl1271 *wl,
const u8 *ssid, size_t ssid_len,
const u8 *ie, size_t ie_len, u8 band);
void wl1271_scan_stm(struct wl1271 *wl);
+void wl1271_scan_complete_work(struct work_struct *work);
#define WL1271_SCAN_MAX_CHANNELS 24
#define WL1271_SCAN_DEFAULT_TAG 1
--
1.6.3.3
--
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