[PATCH v3 4/5] staging: et131x: remove spinlock adapter->lock

ZHAO Gang
2013-11-20T07:58:42Z

adapter->lock is only used in et131x_multicast(), which is eventually
called by network stack function __dev_set_rx_mode(). __dev_set_rx_mode()
is always called by (net_device *)dev->addr_list_lock hold, to protect from
concurrent access. So adapter->lock is redundant.

Signed-off-by: ZHAO Gang <gamerh2o@gmail.com>
---
drivers/staging/et131x/et131x.c | 6 ------
1 file changed, 6 deletions(-)

diff --git a/drivers/staging/et131x/et131x.c b/drivers/staging/et131x/et131x.c
index 6254a6b..66530b1 100644
--- a/drivers/staging/et131x/et131x.c
+++ b/drivers/staging/et131x/et131x.c
@@ -486,8 +486,6 @@ struct et131x_adapter {
u8 eeprom_data[2];

/* Spinlocks */
- spinlock_t lock;
-
spinlock_t tcb_send_qlock;
spinlock_t tcb_ready_qlock;
spinlock_t send_hw_lock;
@@ -3867,7 +3865,6 @@ static struct et131x_adapter *et131x_adapter_init(struct net_device *netdev,
adapter->netdev = netdev;

/* Initialize spinlocks here */
- spin_lock_init(&adapter->lock);
spin_lock_init(&adapter->tcb_send_qlock);
spin_lock_init(&adapter->tcb_ready_qlock);
spin_lock_init(&adapter->send_hw_lock);
@@ -4429,8 +4426,6 @@ static void et131x_multicast(struct net_device *netdev)
struct netdev_hw_addr *ha;
int i;

- spin_lock_irqsave(&adapter->lock, flags);
-
/* Before we modify the platform-independent filter flags, store them
* locally. This allows us to determine if anything's changed and if
* we even need to bother the hardware
@@ -4484,7 +4479,6 @@ static void et131x_multicast(struct net_device *netdev)
/* Call the device's filter function */
et131x_set_packet_filter(adapter);
}
- spin_unlock_irqrestore(&adapter->lock, flags);
}

/* et131x_tx - The handler to tx a packet on the device
--
1.8.3.1