net/mv643xx: don't disable the mib timer too early and lock properly

mib_counters_update() also restarts the timer.
So the timer is dequeued, the stats are read and then the timer is
enqueued again. This is "okay" unless someone unloads the module.
The locking here is also broken:
mib_counters_update() grabs just a simple spinlock. The only thing the
lock is good for is to protect the timer func against other callers
namely mv643xx_eth_stop() && mv643xx_eth_get_ethtool_stats(). That means
if the spinlock is taken via the ethtool path and than the timer kicks
in then the box will lock up.

Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Acked-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index b6ab46942b98217ebcc495034568ec95bdf24011..13f11f402a9948b77878b108dca8ae36ecace50a 100644 (file)
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -1175,7 +1175,7 @@ static void mib_counters_update(struct mv643xx_eth_private *mp)
 {
        struct mib_counters *p = &mp->mib_counters;
 
-       spin_lock(&mp->mib_counters_lock);
+       spin_lock_bh(&mp->mib_counters_lock);
        p->good_octets_received += mib_read(mp, 0x00);
        p->good_octets_received += (u64)mib_read(mp, 0x04) << 32;
        p->bad_octets_received += mib_read(mp, 0x08);
@@ -1208,7 +1208,7 @@ static void mib_counters_update(struct mv643xx_eth_private *mp)
        p->bad_crc_event += mib_read(mp, 0x74);
        p->collision += mib_read(mp, 0x78);
        p->late_collision += mib_read(mp, 0x7c);
-       spin_unlock(&mp->mib_counters_lock);
+       spin_unlock_bh(&mp->mib_counters_lock);
 
        mod_timer(&mp->mib_counters_timer, jiffies + 30 * HZ);
 }
@@ -2216,8 +2216,6 @@ static int mv643xx_eth_stop(struct net_device *dev)
        wrlp(mp, INT_MASK, 0x00000000);
        rdlp(mp, INT_MASK);
 
-       del_timer_sync(&mp->mib_counters_timer);
-
        napi_disable(&mp->napi);
 
        del_timer_sync(&mp->rx_oom);
@@ -2229,6 +2227,7 @@ static int mv643xx_eth_stop(struct net_device *dev)
        port_reset(mp);
        mv643xx_eth_get_stats(dev);
        mib_counters_update(mp);
+       del_timer_sync(&mp->mib_counters_timer);
 
        skb_queue_purge(&mp->rx_recycle);