[patch 37/49] iwl3945: do not send scan command if channel countzero

[Greg KH]

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Reinette Chatre <reinette.chatre@xxxxxxxxx>

commit 14b5433606289dbc5b6fd70ced11462f80e95003 upstream.

Do not send scan command if no channels to scan.

This avoids a Microcode error as reported in:
http://www.intellinuxwireless.org/bugzilla/show_bug.cgi?id=1650
http://bugzilla.kernel.org/show_bug.cgi?id=11806
http://marc.info/?l=linux-wireless&m=122437145211886&w=2

Signed-off-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>
Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/net/wireless/iwlwifi/iwl3945-base.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/net/wireless/iwlwifi/iwl3945-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl3945-base.c
@@ -6259,6 +6259,11 @@ static void iwl3945_bg_request_scan(stru
 				direct_mask,
 				(void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
 
+	if (scan->channel_count == 0) {
+		IWL_DEBUG_SCAN("channel count %d\n", scan->channel_count);
+		goto done;
+	}
+
 	cmd.len += le16_to_cpu(scan->tx_cmd.len) +
 	    scan->channel_count * sizeof(struct iwl3945_scan_channel);
 	cmd.data = scan;

-- 
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