iwlagn: fix minimum number of queues setting

We need to provide a reasonable minimum that will result in a
working setup if used. Set minimum to be 10 to provide for
4 standard TX queues + 1 command queue + 2 (unused) HCCA queues +
4 HT queues (one per AC).

We allow the user to change the number of queues used via a module
parameter and use this minimum value to check if it is valid. Without
this patch a user can select a value for the number of queues that
will result in a failing setup.

Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Tomas Winkler <tomas.winkler@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-3945.h

@@ -112,7 +112,7 @@ enum iwl3945_antenna {
 #define IWL_TX_FIFO_NONE	7
 
 /* Minimum number of queues. MAX_NUM is defined in hw specific files */
-#define IWL_MIN_NUM_QUEUES	4
+#define IWL39_MIN_NUM_QUEUES	4
 
 #define IEEE80211_DATA_LEN              2304
 #define IEEE80211_4ADDR_LEN             30

drivers/net/wireless/iwlwifi/iwl-dev.h

@@ -258,8 +258,10 @@ struct iwl_channel_info {
 #define IWL_TX_FIFO_HCCA_2	6
 #define IWL_TX_FIFO_NONE	7
 
-/* Minimum number of queues. MAX_NUM is defined in hw specific files */
-#define IWL_MIN_NUM_QUEUES	4
+/* Minimum number of queues. MAX_NUM is defined in hw specific files.
+ * Set the minimum to accommodate the 4 standard TX queues, 1 command
+ * queue, 2 (unused) HCCA queues, and 4 HT queues (one for each AC) */
+#define IWL_MIN_NUM_QUEUES	10
 
 /* Power management (not Tx power) structures */
 

drivers/net/wireless/iwlwifi/iwl3945-base.c

@@ -4018,10 +4018,10 @@ static int iwl3945_pci_probe(struct pci_dev *pdev, const struct pci_device_id *e
 	SET_IEEE80211_DEV(hw, &pdev->dev);
 
 	if ((iwl3945_mod_params.num_of_queues > IWL39_MAX_NUM_QUEUES) ||
-	     (iwl3945_mod_params.num_of_queues < IWL_MIN_NUM_QUEUES)) {
+	     (iwl3945_mod_params.num_of_queues < IWL39_MIN_NUM_QUEUES)) {
 		IWL_ERR(priv,
 			"invalid queues_num, should be between %d and %d\n",
-			IWL_MIN_NUM_QUEUES, IWL39_MAX_NUM_QUEUES);
+			IWL39_MIN_NUM_QUEUES, IWL39_MAX_NUM_QUEUES);
 		err = -EINVAL;
 		goto out_ieee80211_free_hw;
 	}