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rapidio/rionet: fix deadlock on SMP 

Fix deadlocking during concurrent receive and transmit operations on SMP
platforms caused by the use of incorrect lock: on transmit 'tx_lock'
spinlock should be used instead of 'lock' which is used for receive
operation.

This fix is applicable to kernel versions starting from v2.15.

Signed-off-by: Aurelien Jacquiot <a-jacquiot@ti.com>
Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Andre van Herk <andre.van.herk@prodrive-technologies.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Aurelien Jacquiot 2016-03-22 14:25:42 -07:00 committed by Linus Torvalds
parent 95f27356e4
commit 36915976ec
1 changed files with 2 additions and 2 deletions
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4
drivers/net/rionet.c
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@ -280,7 +280,7 @@ static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbo
struct net_device *ndev = dev_id;
struct rionet_private *rnet = netdev_priv(ndev);
spin_lock(&rnet->lock);
spin_lock(&rnet->tx_lock);
if (netif_msg_intr(rnet))
printk(KERN_INFO
@ -299,7 +299,7 @@ static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbo
if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
netif_wake_queue(ndev);
spin_unlock(&rnet->lock);
spin_unlock(&rnet->tx_lock);
}
static int rionet_open(struct net_device *ndev)