iwlwifi: do not force complete scan too early
Currently we force scan complete at the end of iwl_scan_cancel_timeout
function. This cause race condition when we can get a new scan request
from mac80211 and complete it by iwl_bg_complete from older scan. Change
code to force scan complete only when really needed: device goes down,
interface is removed or scan timeout occurs.
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Wey-Yi W Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-scan.c b/drivers/net/wireless/iwlwifi/iwl-scan.c
index da037b2..af9a836 100644
--- a/drivers/net/wireless/iwlwifi/iwl-scan.c
+++ b/drivers/net/wireless/iwlwifi/iwl-scan.c
@@ -106,14 +106,22 @@
priv->scan_request = NULL;
}
-static void iwl_force_scan_end(struct iwl_priv *priv)
+void iwl_force_scan_end(struct iwl_priv *priv)
{
+ lockdep_assert_held(&priv->mutex);
+
+ if (!test_bit(STATUS_SCANNING, &priv->status)) {
+ IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
+ return;
+ }
+
IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
clear_bit(STATUS_SCANNING, &priv->status);
clear_bit(STATUS_SCAN_HW, &priv->status);
clear_bit(STATUS_SCAN_ABORTING, &priv->status);
iwl_complete_scan(priv, true);
}
+EXPORT_SYMBOL(iwl_force_scan_end);
static void iwl_do_scan_abort(struct iwl_priv *priv)
{
@@ -157,7 +165,6 @@
*/
int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
{
- int ret;
unsigned long timeout = jiffies + msecs_to_jiffies(ms);
lockdep_assert_held(&priv->mutex);
@@ -172,10 +179,7 @@
msleep(20);
}
- ret = test_bit(STATUS_SCAN_HW, &priv->status);
- if (ret)
- iwl_force_scan_end(priv);
- return ret;
+ return test_bit(STATUS_SCAN_HW, &priv->status);
}
EXPORT_SYMBOL(iwl_scan_cancel_timeout);
@@ -490,8 +494,11 @@
struct iwl_priv *priv =
container_of(data, struct iwl_priv, scan_check.work);
+ /* Since we are here firmware does not finish scan and
+ * most likely is in bad shape, so we don't bother to
+ * send abort command, just force scan complete to mac80211 */
mutex_lock(&priv->mutex);
- iwl_scan_cancel_timeout(priv, 200);
+ iwl_force_scan_end(priv);
mutex_unlock(&priv->mutex);
}
@@ -547,8 +554,8 @@
{
struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
- cancel_delayed_work(&priv->scan_check);
-
+ /* We keep scan_check work queued in case when firmware will not
+ * report back scan completed notification */
mutex_lock(&priv->mutex);
iwl_scan_cancel_timeout(priv, 200);
mutex_unlock(&priv->mutex);
@@ -631,3 +638,16 @@
}
EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
+void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
+{
+ cancel_work_sync(&priv->start_internal_scan);
+ cancel_work_sync(&priv->abort_scan);
+ cancel_work_sync(&priv->scan_completed);
+
+ if (cancel_delayed_work_sync(&priv->scan_check)) {
+ mutex_lock(&priv->mutex);
+ iwl_force_scan_end(priv);
+ mutex_unlock(&priv->mutex);
+ }
+}
+EXPORT_SYMBOL(iwl_cancel_scan_deferred_work);