[PATCH] libertas: push WEXT scan requests to a work queue

Push WEXT scan requests to a workqueue and have each partial scan queue
the next part, then only report results when the complete scan has finished.
Full scans don't go through the work queue.

Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 80 insertions, 59 deletions

diff --git a/drivers/net/wireless/libertas/scan.c b/drivers/net/wireless/libertas/scan.c
index 8d4e1ee27395..e2e9ebcd8340 100644
--- a/drivers/net/wireless/libertas/scan.c
+++ b/drivers/net/wireless/libertas/scan.c
@@ -314,6 +314,16 @@ static void wlan_scan_create_channel_list(wlan_private * priv,
         }
 }
 
+
+/* Delayed partial scan worker */
+void libertas_scan_worker(struct work_struct *work)
+{
+        wlan_private *priv = container_of(work, wlan_private, scan_work.work);
+
+        wlan_scan_networks(priv, NULL, 0);
+}
+
+
 /**
  *  @brief Construct a wlan_scan_cmd_config structure to use in issue scan cmds
  *
@@ -408,7 +418,6 @@ wlan_scan_setup_scan_config(wlan_private * priv,
         *pscancurrentonly = 0;
 
         if (puserscanin) {
-
                 /* Set the bss type scan filter, use adapter setting if unset */
                 pscancfgout->bsstype =
                     puserscanin->bsstype ? puserscanin->bsstype : CMD_BSS_TYPE_ANY;
@@ -468,59 +477,57 @@ wlan_scan_setup_scan_config(wlan_private * priv,
          */
         *ppchantlvout = (struct mrvlietypes_chanlistparamset *) ptlvpos;
 
-        if (puserscanin && puserscanin->chanlist[0].channumber) {
+        if (!puserscanin || !puserscanin->chanlist[0].channumber) {
+                /* Create a default channel scan list */
+                lbs_deb_scan("Scan: Creating full region channel list\n");
+                wlan_scan_create_channel_list(priv, pscanchanlist,
+                                              *pfilteredscan);
+                goto out;
+        }
 
-                lbs_deb_scan("Scan: Using supplied channel list\n");
+        lbs_deb_scan("Scan: Using supplied channel list\n");
+        for (chanidx = 0;
+             chanidx < WLAN_IOCTL_USER_SCAN_CHAN_MAX
+             && puserscanin->chanlist[chanidx].channumber; chanidx++) {
 
-                for (chanidx = 0;
-                     chanidx < WLAN_IOCTL_USER_SCAN_CHAN_MAX
-                     && puserscanin->chanlist[chanidx].channumber; chanidx++) {
+                channel = puserscanin->chanlist[chanidx].channumber;
+                (pscanchanlist + chanidx)->channumber = channel;
 
-                        channel = puserscanin->chanlist[chanidx].channumber;
-                        (pscanchanlist + chanidx)->channumber = channel;
+                radiotype = puserscanin->chanlist[chanidx].radiotype;
+                (pscanchanlist + chanidx)->radiotype = radiotype;
 
-                        radiotype = puserscanin->chanlist[chanidx].radiotype;
-                        (pscanchanlist + chanidx)->radiotype = radiotype;
+                scantype = puserscanin->chanlist[chanidx].scantype;
 
-                        scantype = puserscanin->chanlist[chanidx].scantype;
+                if (scantype == CMD_SCAN_TYPE_PASSIVE) {
+                        (pscanchanlist +
+                         chanidx)->chanscanmode.passivescan = 1;
+                } else {
+                        (pscanchanlist +
+                         chanidx)->chanscanmode.passivescan = 0;
+                }
 
+                if (puserscanin->chanlist[chanidx].scantime) {
+                        scandur = puserscanin->chanlist[chanidx].scantime;
+                } else {
                         if (scantype == CMD_SCAN_TYPE_PASSIVE) {
-                                (pscanchanlist +
-                                 chanidx)->chanscanmode.passivescan = 1;
-                        } else {
-                                (pscanchanlist +
-                                 chanidx)->chanscanmode.passivescan = 0;
-                        }
-
-                        if (puserscanin->chanlist[chanidx].scantime) {
-                                scandur =
-                                    puserscanin->chanlist[chanidx].scantime;
+                                scandur = MRVDRV_PASSIVE_SCAN_CHAN_TIME;
                         } else {
-                                if (scantype == CMD_SCAN_TYPE_PASSIVE) {
-                                        scandur = MRVDRV_PASSIVE_SCAN_CHAN_TIME;
-                                } else {
-                                        scandur = MRVDRV_ACTIVE_SCAN_CHAN_TIME;
-                                }
+                                scandur = MRVDRV_ACTIVE_SCAN_CHAN_TIME;
                         }
-
-                        (pscanchanlist + chanidx)->minscantime =
-                            cpu_to_le16(scandur);
-                        (pscanchanlist + chanidx)->maxscantime =
-                            cpu_to_le16(scandur);
                 }
 
-                /* Check if we are only scanning the current channel */
-                if ((chanidx == 1) && (puserscanin->chanlist[0].channumber
-                                       ==
-                                       priv->adapter->curbssparams.channel)) {
-                        *pscancurrentonly = 1;
-                        lbs_deb_scan("Scan: Scanning current channel only");
-                }
+                (pscanchanlist + chanidx)->minscantime =
+                    cpu_to_le16(scandur);
+                (pscanchanlist + chanidx)->maxscantime =
+                    cpu_to_le16(scandur);
+        }
 
-        } else {
-                lbs_deb_scan("Scan: Creating full region channel list\n");
-                wlan_scan_create_channel_list(priv, pscanchanlist,
-                                              *pfilteredscan);
+        /* Check if we are only scanning the current channel */
+        if ((chanidx == 1) &&
+            (puserscanin->chanlist[0].channumber ==
+                               priv->adapter->curbssparams.channel)) {
+                *pscancurrentonly = 1;
+                lbs_deb_scan("Scan: Scanning current channel only");
         }
 
 out:
@@ -604,12 +611,12 @@ static int wlan_scan_channel_list(wlan_private * priv,
                 while (tlvidx < maxchanperscan && ptmpchan->channumber
                        && !doneearly && scanned < 2) {
 
-            lbs_deb_scan(
-                    "Scan: Chan(%3d), Radio(%d), mode(%d,%d), Dur(%d)\n",
-                ptmpchan->channumber, ptmpchan->radiotype,
-                ptmpchan->chanscanmode.passivescan,
-                ptmpchan->chanscanmode.disablechanfilt,
-                ptmpchan->maxscantime);
+                        lbs_deb_scan("Scan: Chan(%3d), Radio(%d), mode(%d,%d), "
+                                     "Dur(%d)\n",
+                                     ptmpchan->channumber, ptmpchan->radiotype,
+                                     ptmpchan->chanscanmode.passivescan,
+                                     ptmpchan->chanscanmode.disablechanfilt,
+                                     ptmpchan->maxscantime);
 
                         /* Copy the current channel TLV to the command being prepared */
                         memcpy(pchantlvout->chanscanparam + tlvidx,
@@ -678,9 +685,18 @@ static int wlan_scan_channel_list(wlan_private * priv,
 done:
         priv->adapter->last_scanned_channel = ptmpchan->channumber;
 
-        /* Tell userspace the scan table has been updated */
-        memset(&wrqu, 0, sizeof(union iwreq_data));
-        wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
+        if (priv->adapter->last_scanned_channel) {
+                /* Schedule the next part of the partial scan */
+                if (!full_scan && !priv->adapter->surpriseremoved) {
+                        cancel_delayed_work(&priv->scan_work);
+                        queue_delayed_work(priv->work_thread, &priv->scan_work,
+                                           msecs_to_jiffies(300));
+                }
+        } else {
+                /* All done, tell userspace the scan table has been updated */
+                memset(&wrqu, 0, sizeof(union iwreq_data));
+                wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
+        }
 
         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
         return ret;
@@ -747,8 +763,8 @@ clear_selected_scan_list_entries(wlan_adapter * adapter,
  *  @return              0 or < 0 if error
  */
 int wlan_scan_networks(wlan_private * priv,
-                              const struct wlan_ioctl_user_scan_cfg * puserscanin,
-                              int full_scan)
+                       const struct wlan_ioctl_user_scan_cfg * puserscanin,
+                       int full_scan)
 {
         wlan_adapter * adapter = priv->adapter;
         struct mrvlietypes_chanlistparamset *pchantlvout;
@@ -763,7 +779,13 @@ int wlan_scan_networks(wlan_private * priv,
         int i = 0;
 #endif
 
-        lbs_deb_enter(LBS_DEB_ASSOC);
+        lbs_deb_enter(LBS_DEB_SCAN);
+
+        /* Cancel any partial outstanding partial scans if this scan
+         * is a full scan.
+         */
+        if (full_scan && delayed_work_pending(&priv->scan_work))
+                cancel_delayed_work(&priv->scan_work);
 
         scan_chan_list = kzalloc(sizeof(struct chanscanparamset) *
                                 WLAN_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
@@ -1289,7 +1311,10 @@ int libertas_set_scan(struct net_device *dev, struct iw_request_info *info,
 
         lbs_deb_enter(LBS_DEB_SCAN);
 
-        wlan_scan_networks(priv, NULL, 0);
+        if (!delayed_work_pending(&priv->scan_work)) {
+                queue_delayed_work(priv->work_thread, &priv->scan_work,
+                                   msecs_to_jiffies(50));
+        }
 
         if (adapter->surpriseremoved)
                 return -1;
@@ -1508,10 +1533,6 @@ int libertas_get_scan(struct net_device *dev, struct iw_request_info *info,
 
         lbs_deb_enter(LBS_DEB_ASSOC);
 
-        /* If we've got an uncompleted scan, schedule the next part */
-        if (!adapter->nr_cmd_pending && adapter->last_scanned_channel)
-                wlan_scan_networks(priv, NULL, 0);
-
         /* Update RSSI if current BSS is a locally created ad-hoc BSS */
         if ((adapter->mode == IW_MODE_ADHOC) && adapter->adhoccreate) {
                 libertas_prepare_and_send_command(priv, CMD_802_11_RSSI, 0,