libertas: better scan response debugging

Make it a bit easier to debug scan results in the future.

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

diff --git a/drivers/net/wireless/libertas/cfg.c b/drivers/net/wireless/libertas/cfg.c
index 51a96f5..8bf88fa 100644 (file)
--- a/drivers/net/wireless/libertas/cfg.c
+++ b/drivers/net/wireless/libertas/cfg.c
@@ -524,20 +524,31 @@ static int lbs_ret_scan(struct lbs_private *priv, unsigned long dummy,
 
        pos = scanresp->bssdesc_and_tlvbuffer;
 
+       lbs_deb_hex(LBS_DEB_SCAN, "SCAN_RSP", scanresp->bssdesc_and_tlvbuffer,
+                       scanresp->bssdescriptsize);
+
        tsfdesc = pos + bsssize;
        tsfsize = 4 + 8 * scanresp->nr_sets;
+       lbs_deb_hex(LBS_DEB_SCAN, "SCAN_TSF", (u8 *) tsfdesc, tsfsize);
 
        /* Validity check: we expect a Marvell-Local TLV */
        i = get_unaligned_le16(tsfdesc);
        tsfdesc += 2;
-       if (i != TLV_TYPE_TSFTIMESTAMP)
+       if (i != TLV_TYPE_TSFTIMESTAMP) {
+               lbs_deb_scan("scan response: invalid TSF Timestamp %d\n", i);
                goto done;
+       }
+
        /* Validity check: the TLV holds TSF values with 8 bytes each, so
         * the size in the TLV must match the nr_sets value */
        i = get_unaligned_le16(tsfdesc);
        tsfdesc += 2;
-       if (i / 8 != scanresp->nr_sets)
+       if (i / 8 != scanresp->nr_sets) {
+               lbs_deb_scan("scan response: invalid number of TSF timestamp "
+                            "sets (expected %d got %d)\n", scanresp->nr_sets,
+                            i / 8);
                goto done;
+       }
 
        for (i = 0; i < scanresp->nr_sets; i++) {
                const u8 *bssid;
@@ -579,8 +590,11 @@ static int lbs_ret_scan(struct lbs_private *priv, unsigned long dummy,
                        id = *pos++;
                        elen = *pos++;
                        left -= 2;
-                       if (elen > left || elen == 0)
+                       if (elen > left || elen == 0) {
+                               lbs_deb_scan("scan response: invalid IE fmt\n");
                                goto done;
+                       }
+
                        if (id == WLAN_EID_DS_PARAMS)
                                chan_no = *pos;
                        if (id == WLAN_EID_SSID) {
@@ -611,7 +625,9 @@ static int lbs_ret_scan(struct lbs_private *priv, unsigned long dummy,
                                        capa, intvl, ie, ielen,
                                        LBS_SCAN_RSSI_TO_MBM(rssi),
                                        GFP_KERNEL);
-               }
+               } else
+                       lbs_deb_scan("scan response: missing BSS channel IE\n");
+
                tsfdesc += 8;
        }
        ret = 0;