iwlwifi: queue functions cleanup

This patch moves
1. iwl_queue_inc_wrap and int iwl_queue_dec_wrap
into  iwl-helpers.h these two functions are identical to common
for both iwl3956 and iwl4965
2. renames x2_queue_used to iwl3945_x2_queue_used
3. exports iwl3945_queue_space out of iwl3964-base.c

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

4 files changed, 45 insertions, 60 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-3945.h b/drivers/net/wireless/iwlwifi/iwl-3945.h
index a238e833251f..0ab22d366d93 100644
--- a/drivers/net/wireless/iwlwifi/iwl-3945.h
+++ b/drivers/net/wireless/iwlwifi/iwl-3945.h
@@ -116,6 +116,9 @@ struct iwl3945_queue {
                                 * space less than this */
 } __attribute__ ((packed));
 
+int iwl3945_queue_space(const struct iwl3945_queue *q);
+int iwl3945_x2_queue_used(const struct iwl3945_queue *q, int i);
+
 #define MAX_NUM_OF_TBS          (20)
 
 /* One for each TFD */
diff --git a/drivers/net/wireless/iwlwifi/iwl-helpers.h b/drivers/net/wireless/iwlwifi/iwl-helpers.h
index 8993cca81b40..736b88881b03 100644
--- a/drivers/net/wireless/iwlwifi/iwl-helpers.h
+++ b/drivers/net/wireless/iwlwifi/iwl-helpers.h
@@ -254,6 +254,26 @@ static inline u8 iwl_get_dma_hi_address(dma_addr_t addr)
         return sizeof(addr) > sizeof(u32) ? (addr >> 16) >> 16 : 0;
 }
 
+/**
+ * iwl_queue_inc_wrap - increment queue index, wrap back to beginning
+ * @index -- current index
+ * @n_bd -- total number of entries in queue (must be power of 2)
+ */
+static inline int iwl_queue_inc_wrap(int index, int n_bd)
+{
+        return ++index & (n_bd - 1);
+}
+
+/**
+ * iwl_queue_dec_wrap - decrement queue index, wrap back to end
+ * @index -- current index
+ * @n_bd -- total number of entries in queue (must be power of 2)
+ */
+static inline int iwl_queue_dec_wrap(int index, int n_bd)
+{
+        return --index & (n_bd - 1);
+}
+
 /* TODO: Move fw_desc functions to iwl-pci.ko */
 static inline void iwl_free_fw_desc(struct pci_dev *pci_dev,
                                     struct fw_desc *desc)
diff --git a/drivers/net/wireless/iwlwifi/iwl3945-base.c b/drivers/net/wireless/iwlwifi/iwl3945-base.c
index 4aaced0b9f26..39fd5440a248 100644
--- a/drivers/net/wireless/iwlwifi/iwl3945-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl3945-base.c
@@ -183,7 +183,7 @@ static const char *iwl3945_escape_essid(const char *essid, u8 essid_len)
  * (#0-3) for data tx via EDCA.  An additional 2 HCCA queues are unused.
  ***************************************************/
 
-static int iwl3945_queue_space(const struct iwl3945_queue *q)
+int iwl3945_queue_space(const struct iwl3945_queue *q)
 {
         int s = q->read_ptr - q->write_ptr;
 
@@ -199,33 +199,14 @@ static int iwl3945_queue_space(const struct iwl3945_queue *q)
         return s;
 }
 
-/**
- * iwl3945_queue_inc_wrap - increment queue index, wrap back to beginning
- * @index -- current index
- * @n_bd -- total number of entries in queue (must be power of 2)
- */
-static inline int iwl3945_queue_inc_wrap(int index, int n_bd)
-{
-        return ++index & (n_bd - 1);
-}
-
-/**
- * iwl3945_queue_dec_wrap - increment queue index, wrap back to end
- * @index -- current index
- * @n_bd -- total number of entries in queue (must be power of 2)
- */
-static inline int iwl3945_queue_dec_wrap(int index, int n_bd)
-{
-        return --index & (n_bd - 1);
-}
-
-static inline int x2_queue_used(const struct iwl3945_queue *q, int i)
+int iwl3945_x2_queue_used(const struct iwl3945_queue *q, int i)
 {
         return q->write_ptr > q->read_ptr ?
                 (i >= q->read_ptr && i < q->write_ptr) :
                 !(i < q->read_ptr && i >= q->write_ptr);
 }
 
+
 static inline u8 get_cmd_index(struct iwl3945_queue *q, u32 index, int is_huge)
 {
         /* This is for scan command, the big buffer at end of command array */
@@ -246,8 +227,8 @@ static int iwl3945_queue_init(struct iwl3945_priv *priv, struct iwl3945_queue *q
         q->n_window = slots_num;
         q->id = id;
 
-        /* count must be power-of-two size, otherwise iwl3945_queue_inc_wrap
-         * and iwl3945_queue_dec_wrap are broken. */
+        /* count must be power-of-two size, otherwise iwl_queue_inc_wrap
+         * and iwl_queue_dec_wrap are broken. */
         BUG_ON(!is_power_of_2(count));
 
         /* slots_num must be power-of-two size, otherwise
@@ -347,7 +328,7 @@ int iwl3945_tx_queue_init(struct iwl3945_priv *priv,
         txq->need_update = 0;
 
         /* TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise
-         * iwl3945_queue_inc_wrap and iwl3945_queue_dec_wrap are broken. */
+         * iwl_queue_inc_wrap and iwl_queue_dec_wrap are broken. */
         BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1));
 
         /* Initialize queue high/low-water, head/tail indexes */
@@ -378,7 +359,7 @@ void iwl3945_tx_queue_free(struct iwl3945_priv *priv, struct iwl3945_tx_queue *t
 
         /* first, empty all BD's */
         for (; q->write_ptr != q->read_ptr;
-             q->read_ptr = iwl3945_queue_inc_wrap(q->read_ptr, q->n_bd))
+             q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd))
                 iwl3945_hw_txq_free_tfd(priv, txq);
 
         len = sizeof(struct iwl3945_cmd) * q->n_window;
@@ -717,7 +698,7 @@ static int iwl3945_enqueue_hcmd(struct iwl3945_priv *priv, struct iwl3945_host_c
         txq->need_update = 1;
 
         /* Increment and update queue's write index */
-        q->write_ptr = iwl3945_queue_inc_wrap(q->write_ptr, q->n_bd);
+        q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd);
         ret = iwl3945_tx_queue_update_write_ptr(priv, txq);
 
         spin_unlock_irqrestore(&priv->hcmd_lock, flags);
@@ -2797,7 +2778,7 @@ static int iwl3945_tx_skb(struct iwl3945_priv *priv,
                            ieee80211_get_hdrlen(fc));
 
         /* Tell device the write index *just past* this latest filled TFD */
-        q->write_ptr = iwl3945_queue_inc_wrap(q->write_ptr, q->n_bd);
+        q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd);
         rc = iwl3945_tx_queue_update_write_ptr(priv, txq);
         spin_unlock_irqrestore(&priv->lock, flags);
 
@@ -3189,16 +3170,16 @@ static int iwl3945_tx_queue_reclaim(struct iwl3945_priv *priv, int txq_id, int i
         struct iwl3945_queue *q = &txq->q;
         int nfreed = 0;
 
-        if ((index >= q->n_bd) || (x2_queue_used(q, index) == 0)) {
+        if ((index >= q->n_bd) || (iwl3945_x2_queue_used(q, index) == 0)) {
                 IWL_ERROR("Read index for DMA queue txq id (%d), index %d, "
                           "is out of range [0-%d] %d %d.\n", txq_id,
                           index, q->n_bd, q->write_ptr, q->read_ptr);
                 return 0;
         }
 
-        for (index = iwl3945_queue_inc_wrap(index, q->n_bd);
+        for (index = iwl_queue_inc_wrap(index, q->n_bd);
                 q->read_ptr != index;
-                q->read_ptr = iwl3945_queue_inc_wrap(q->read_ptr, q->n_bd)) {
+                q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) {
                 if (txq_id != IWL_CMD_QUEUE_NUM) {
                         iwl3945_txstatus_to_ieee(priv,
                                         &(txq->txb[txq->q.read_ptr]));
@@ -3245,7 +3226,7 @@ static void iwl3945_rx_reply_tx(struct iwl3945_priv *priv,
         struct iwl3945_tx_resp *tx_resp = (void *)&pkt->u.raw[0];
         u32  status = le32_to_cpu(tx_resp->status);
 
-        if ((index >= txq->q.n_bd) || (x2_queue_used(&txq->q, index) == 0)) {
+        if ((index >= txq->q.n_bd) || (iwl3945_x2_queue_used(&txq->q, index) == 0)) {
                 IWL_ERROR("Read index for DMA queue txq_id (%d) index %d "
                           "is out of range [0-%d] %d %d\n", txq_id,
                           index, txq->q.n_bd, txq->q.write_ptr,
diff --git a/drivers/net/wireless/iwlwifi/iwl4965-base.c b/drivers/net/wireless/iwlwifi/iwl4965-base.c
index af95626a6112..28c64c39ef02 100644
--- a/drivers/net/wireless/iwlwifi/iwl4965-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl4965-base.c
@@ -194,25 +194,6 @@ int iwl4965_queue_space(const struct iwl4965_queue *q)
         return s;
 }
 
-/**
- * iwl4965_queue_inc_wrap - increment queue index, wrap back to beginning
- * @index -- current index
- * @n_bd -- total number of entries in queue (must be power of 2)
- */
-static inline int iwl4965_queue_inc_wrap(int index, int n_bd)
-{
-        return ++index & (n_bd - 1);
-}
-
-/**
- * iwl4965_queue_dec_wrap - decrement queue index, wrap back to end
- * @index -- current index
- * @n_bd -- total number of entries in queue (must be power of 2)
- */
-static inline int iwl4965_queue_dec_wrap(int index, int n_bd)
-{
-        return --index & (n_bd - 1);
-}
 
 static inline int x2_queue_used(const struct iwl4965_queue *q, int i)
 {
@@ -241,8 +222,8 @@ static int iwl4965_queue_init(struct iwl4965_priv *priv, struct iwl4965_queue *q
         q->n_window = slots_num;
         q->id = id;
 
-        /* count must be power-of-two size, otherwise iwl4965_queue_inc_wrap
-         * and iwl4965_queue_dec_wrap are broken. */
+        /* count must be power-of-two size, otherwise iwl_queue_inc_wrap
+         * and iwl_queue_dec_wrap are broken. */
         BUG_ON(!is_power_of_2(count));
 
         /* slots_num must be power-of-two size, otherwise
@@ -342,7 +323,7 @@ int iwl4965_tx_queue_init(struct iwl4965_priv *priv,
         txq->need_update = 0;
 
         /* TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise
-         * iwl4965_queue_inc_wrap and iwl4965_queue_dec_wrap are broken. */
+         * iwl_queue_inc_wrap and iwl_queue_dec_wrap are broken. */
         BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1));
 
         /* Initialize queue's high/low-water marks, and head/tail indexes */
@@ -373,7 +354,7 @@ void iwl4965_tx_queue_free(struct iwl4965_priv *priv, struct iwl4965_tx_queue *t
 
         /* first, empty all BD's */
         for (; q->write_ptr != q->read_ptr;
-             q->read_ptr = iwl4965_queue_inc_wrap(q->read_ptr, q->n_bd))
+             q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd))
                 iwl4965_hw_txq_free_tfd(priv, txq);
 
         len = sizeof(struct iwl4965_cmd) * q->n_window;
@@ -714,7 +695,7 @@ static int iwl4965_enqueue_hcmd(struct iwl4965_priv *priv, struct iwl4965_host_c
         ret = iwl4965_tx_queue_update_wr_ptr(priv, txq, 0);
 
         /* Increment and update queue's write index */
-        q->write_ptr = iwl4965_queue_inc_wrap(q->write_ptr, q->n_bd);
+        q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd);
         iwl4965_tx_queue_update_write_ptr(priv, txq);
 
         spin_unlock_irqrestore(&priv->hcmd_lock, flags);
@@ -2897,7 +2878,7 @@ static int iwl4965_tx_skb(struct iwl4965_priv *priv,
         iwl4965_tx_queue_update_wr_ptr(priv, txq, len);
 
         /* Tell device the write index *just past* this latest filled TFD */
-        q->write_ptr = iwl4965_queue_inc_wrap(q->write_ptr, q->n_bd);
+        q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd);
         rc = iwl4965_tx_queue_update_write_ptr(priv, txq);
         spin_unlock_irqrestore(&priv->lock, flags);
 
@@ -3291,9 +3272,9 @@ int iwl4965_tx_queue_reclaim(struct iwl4965_priv *priv, int txq_id, int index)
                 return 0;
         }
 
-        for (index = iwl4965_queue_inc_wrap(index, q->n_bd);
+        for (index = iwl_queue_inc_wrap(index, q->n_bd);
                 q->read_ptr != index;
-                q->read_ptr = iwl4965_queue_inc_wrap(q->read_ptr, q->n_bd)) {
+                q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) {
                 if (txq_id != IWL_CMD_QUEUE_NUM) {
                         iwl4965_txstatus_to_ieee(priv,
                                         &(txq->txb[txq->q.read_ptr]));
@@ -3538,7 +3519,7 @@ static void iwl4965_rx_reply_tx(struct iwl4965_priv *priv,
 
                 if (txq->q.read_ptr != (scd_ssn & 0xff)) {
                         int freed;
-                        index = iwl4965_queue_dec_wrap(scd_ssn & 0xff, txq->q.n_bd);
+                        index = iwl_queue_dec_wrap(scd_ssn & 0xff, txq->q.n_bd);
                         IWL_DEBUG_TX_REPLY("Retry scheduler reclaim scd_ssn "
                                            "%d index %d\n", scd_ssn , index);
                         freed = iwl4965_tx_queue_reclaim(priv, txq_id, index);