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path: root/drivers/net/wimax/i2400m/tx.c
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Diffstat (limited to 'drivers/net/wimax/i2400m/tx.c')
-rw-r--r--drivers/net/wimax/i2400m/tx.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/drivers/net/wimax/i2400m/tx.c b/drivers/net/wimax/i2400m/tx.c
index fa16ccf8e26a..54480e8947f1 100644
--- a/drivers/net/wimax/i2400m/tx.c
+++ b/drivers/net/wimax/i2400m/tx.c
@@ -310,7 +310,7 @@ size_t __i2400m_tx_tail_room(struct i2400m *i2400m)
size_t tail_room;
size_t tx_in;
- if (unlikely(i2400m->tx_in) == 0)
+ if (unlikely(i2400m->tx_in == 0))
return I2400M_TX_BUF_SIZE;
tx_in = i2400m->tx_in % I2400M_TX_BUF_SIZE;
tail_room = I2400M_TX_BUF_SIZE - tx_in;
@@ -642,6 +642,9 @@ int i2400m_tx(struct i2400m *i2400m, const void *buf, size_t buf_len,
* current one is out of payload slots or we have a singleton,
* close it and start a new one */
spin_lock_irqsave(&i2400m->tx_lock, flags);
+ result = -ESHUTDOWN;
+ if (i2400m->tx_buf == NULL)
+ goto error_tx_new;
try_new:
if (unlikely(i2400m->tx_msg == NULL))
i2400m_tx_new(i2400m);
@@ -697,7 +700,10 @@ try_new:
}
error_tx_new:
spin_unlock_irqrestore(&i2400m->tx_lock, flags);
- i2400m->bus_tx_kick(i2400m); /* always kick, might free up space */
+ /* kick in most cases, except when the TX subsys is down, as
+ * it might free space */
+ if (likely(result != -ESHUTDOWN))
+ i2400m->bus_tx_kick(i2400m);
d_fnend(3, dev, "(i2400m %p skb %p [%zu bytes] pt %u) = %d\n",
i2400m, buf, buf_len, pl_type, result);
return result;
@@ -740,6 +746,9 @@ struct i2400m_msg_hdr *i2400m_tx_msg_get(struct i2400m *i2400m,
d_fnstart(3, dev, "(i2400m %p bus_size %p)\n", i2400m, bus_size);
spin_lock_irqsave(&i2400m->tx_lock, flags);
+ tx_msg_moved = NULL;
+ if (i2400m->tx_buf == NULL)
+ goto out_unlock;
skip:
tx_msg_moved = NULL;
if (i2400m->tx_in == i2400m->tx_out) { /* Empty FIFO? */
@@ -829,6 +838,8 @@ void i2400m_tx_msg_sent(struct i2400m *i2400m)
d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
spin_lock_irqsave(&i2400m->tx_lock, flags);
+ if (i2400m->tx_buf == NULL)
+ goto out_unlock;
i2400m->tx_out += i2400m->tx_msg_size;
d_printf(2, dev, "TX: sent %zu b\n", (size_t) i2400m->tx_msg_size);
i2400m->tx_msg_size = 0;
@@ -837,6 +848,7 @@ void i2400m_tx_msg_sent(struct i2400m *i2400m)
n = i2400m->tx_out / I2400M_TX_BUF_SIZE;
i2400m->tx_out %= I2400M_TX_BUF_SIZE;
i2400m->tx_in -= n * I2400M_TX_BUF_SIZE;
+out_unlock:
spin_unlock_irqrestore(&i2400m->tx_lock, flags);
d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
}
@@ -876,5 +888,9 @@ int i2400m_tx_setup(struct i2400m *i2400m)
*/
void i2400m_tx_release(struct i2400m *i2400m)
{
+ unsigned long flags;
+ spin_lock_irqsave(&i2400m->tx_lock, flags);
kfree(i2400m->tx_buf);
+ i2400m->tx_buf = NULL;
+ spin_unlock_irqrestore(&i2400m->tx_lock, flags);
}