diff options
| -rw-r--r-- | drivers/net/wimax/i2400m/tx.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/net/wimax/i2400m/tx.c b/drivers/net/wimax/i2400m/tx.c index 1725f2b022a2..101550a2f5a2 100644 --- a/drivers/net/wimax/i2400m/tx.c +++ b/drivers/net/wimax/i2400m/tx.c @@ -396,8 +396,20 @@ void *i2400m_tx_fifo_push(struct i2400m *i2400m, size_t size, size_t padding) /* Is there space at the tail? */ tail_room = __i2400m_tx_tail_room(i2400m); if (tail_room < needed_size) { - if (i2400m->tx_out % I2400M_TX_BUF_SIZE - < i2400m->tx_in % I2400M_TX_BUF_SIZE) { + /* + * If the tail room space is not enough to push the message + * in the TX FIFO, then there are two possibilities: + * 1. There is enough head room space to accommodate + * this message in the TX FIFO. + * 2. There is not enough space in the head room and + * in tail room of the TX FIFO to accommodate the message. + * In the case (1), return TAIL_FULL so that the caller + * can figure out, if the caller wants to push the message + * into the head room space. + * In the case (2), return NULL, indicating that the TX FIFO + * cannot accommodate the message. + */ + if (room - tail_room >= needed_size) { d_printf(2, dev, "fifo push %zu/%zu: tail full\n", size, padding); return TAIL_FULL; /* There might be head space */ |