---

yaml
---
r: 195119
b: refs/heads/master
c: 2750290
h: refs/heads/master
i:
  195117: a129546
  195115: 91d4ae0
  195111: 8a45be1
  195103: 4b225d7
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 0809a7bbe8fbcb4e899b0a3224d8461bd74987e0
+refs/heads/master: 27502908866ba37d03594e7f7ee7b649cb007330

trunk/drivers/net/wimax/i2400m/i2400m.h

@@ -242,6 +242,11 @@ struct i2400m_barker_db;
  *     so we have a tx_blk_size variable that the bus layer sets to
  *     tell the engine how much of that we need.
  *
+ * @bus_tx_room_min: [fill] Minimum room required while allocating
+ *     TX queue's buffer space for message header. SDIO requires
+ *     224 bytes and USB 16 bytes. Refer bus specific driver code
+ *     for details.
+ *
  * @bus_pl_size_max: [fill] Maximum payload size.
  *
  * @bus_setup: [optional fill] Function called by the bus-generic code
@@ -573,6 +578,7 @@ struct i2400m {
 	wait_queue_head_t state_wq;	/* Woken up when on state updates */
 
 	size_t bus_tx_block_size;
+	size_t bus_tx_room_min;
 	size_t bus_pl_size_max;
 	unsigned bus_bm_retries;
 

trunk/drivers/net/wimax/i2400m/tx.c

@@ -563,8 +563,17 @@ void i2400m_tx_new(struct i2400m *i2400m)
 	struct i2400m_msg_hdr *tx_msg;
 	bool try_head = 0;
 	BUG_ON(i2400m->tx_msg != NULL);
+	/*
+	 * In certain situations, TX queue might have enough space to
+	 * accommodate the new message header I2400M_TX_PLD_SIZE, but
+	 * might not have enough space to accommodate the payloads.
+	 * Adding bus_tx_room_min padding while allocating a new TX message
+	 * increases the possibilities of including at least one payload of the
+	 * size <= bus_tx_room_min.
+	 */
 try_head:
-	tx_msg = i2400m_tx_fifo_push(i2400m, I2400M_TX_PLD_SIZE, 0, try_head);
+	tx_msg = i2400m_tx_fifo_push(i2400m, I2400M_TX_PLD_SIZE,
+				     i2400m->bus_tx_room_min, try_head);
 	if (tx_msg == NULL)
 		goto out;
 	else if (tx_msg == TAIL_FULL) {