libertas: store rssi as an u32

Don't store an (hardware base) u8 value in bss_descriptor, but just an
unsigned int (RSSI is really unsigned). Compilers generate more efficent
code for ints than for bytes.
Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/libertas/debugfs.c

@@ -78,7 +78,7 @@ static ssize_t lbs_getscantable(struct file *file, char __user *userbuf,
 		u16 spectrum_mgmt = (iter_bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT);
 
 		pos += snprintf(buf+pos, len-pos,
-			"%02u| %03d | %04ld | %s |",
+			"%02u| %03d | %04d | %s |",
 			numscansdone, iter_bss->channel, iter_bss->rssi,
 			print_mac(mac, iter_bss->bssid));
 		pos += snprintf(buf+pos, len-pos, " %04x-", iter_bss->capability);

drivers/net/wireless/libertas/scan.c

@@ -602,7 +602,7 @@ static int lbs_scan_networks(struct lbs_private *priv, int full_scan)
 	lbs_deb_scan("scan table:\n");
 	list_for_each_entry(iter, &priv->network_list, list)
 		lbs_deb_scan("%02d: BSSID %s, RSSI %d, SSID '%s'\n",
-			     i++, print_mac(mac, iter->bssid), (int)iter->rssi,
+			     i++, print_mac(mac, iter->bssid), iter->rssi,
 			     escape_essid(iter->ssid, iter->ssid_len));
 	mutex_unlock(&priv->lock);
 #endif
@@ -948,7 +948,7 @@ struct bss_descriptor *lbs_find_ssid_in_list(struct lbs_private *priv,
 					     uint8_t *bssid, uint8_t mode,
 					     int channel)
 {
-	uint8_t bestrssi = 0;
+	u32 bestrssi = 0;
 	struct bss_descriptor * iter_bss = NULL;
 	struct bss_descriptor * found_bss = NULL;
 	struct bss_descriptor * tmp_oldest = NULL;

drivers/net/wireless/libertas/scan.h

@@ -34,14 +34,9 @@ struct bss_descriptor {
 	u8 ssid_len;
 
 	u16 capability;
-
-	/* receive signal strength in dBm */
-	long rssi;
-
+	u32 rssi;
 	u32 channel;
-
 	u16 beaconperiod;
-
 	u32 atimwindow;
 
 	/* IW_MODE_AUTO, IW_MODE_ADHOC, IW_MODE_INFRA */