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sfc: Use ACCESS_ONCE when copying efx_tx_queue::read_count 

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Ben Hutchings 2010-11-10 18:46:40 +00:00
parent ab28c12a8e
commit 51c56f40ef
1 changed files with 2 additions and 3 deletions
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5
drivers/net/sfc/tx.c
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@ -240,8 +240,7 @@ netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
* of read_count. */
smp_mb();
tx_queue->old_read_count =
*(volatile unsigned *)
&tx_queue->read_count;
ACCESS_ONCE(tx_queue->read_count);
fill_level = (tx_queue->insert_count
- tx_queue->old_read_count);
q_space = efx->txq_entries - 1 - fill_level;
@ -764,7 +763,7 @@ static int efx_tx_queue_insert(struct efx_tx_queue *tx_queue,
* stopped from the access of read_count. */
smp_mb();
tx_queue->old_read_count =
*(volatile unsigned *)&tx_queue->read_count;
ACCESS_ONCE(tx_queue->read_count);
fill_level = (tx_queue->insert_count
- tx_queue->old_read_count);
q_space = efx->txq_entries - 1 - fill_level;