path: root/drivers/net/ethernet
diff options
authorMarek Vasut <marex@denx.de>2020-02-23 14:38:40 +0100
committerDavid S. Miller <davem@davemloft.net>2020-02-23 20:53:42 -0800
commit44343418d0f2f623cb9da6f5000df793131cbe3b (patch)
tree0f3f2402d2dbc7b5b7e7e9e8223ba6fd40d6bbce /drivers/net/ethernet
parentdocs: networking: phy: Rephrase paragraph for clarity (diff)
net: ks8851-ml: Fix IRQ handling and locking
The KS8851 requires that packet RX and TX are mutually exclusive. Currently, the driver hopes to achieve this by disabling interrupt from the card by writing the card registers and by disabling the interrupt on the interrupt controller. This however is racy on SMP. Replace this approach by expanding the spinlock used around the ks_start_xmit() TX path to ks_irq() RX path to assure true mutual exclusion and remove the interrupt enabling/disabling, which is now not needed anymore. Furthermore, disable interrupts also in ks_net_stop(), which was missing before. Note that a massive improvement here would be to re-use the KS8851 driver approach, which is to move the TX path into a worker thread, interrupt handling to threaded interrupt, and synchronize everything with mutexes, but that would be a much bigger rework, for a separate patch. Signed-off-by: Marek Vasut <marex@denx.de> Cc: David S. Miller <davem@davemloft.net> Cc: Lukas Wunner <lukas@wunner.de> Cc: Petr Stetiar <ynezz@true.cz> Cc: YueHaibing <yuehaibing@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet')
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/net/ethernet/micrel/ks8851_mll.c b/drivers/net/ethernet/micrel/ks8851_mll.c
index 1c9e70c8cc30..58579baf3f7a 100644
--- a/drivers/net/ethernet/micrel/ks8851_mll.c
+++ b/drivers/net/ethernet/micrel/ks8851_mll.c
@@ -513,14 +513,17 @@ static irqreturn_t ks_irq(int irq, void *pw)
struct net_device *netdev = pw;
struct ks_net *ks = netdev_priv(netdev);
+ unsigned long flags;
u16 status;
+ spin_lock_irqsave(&ks->statelock, flags);
/*this should be the first in IRQ handler */
status = ks_rdreg16(ks, KS_ISR);
if (unlikely(!status)) {
+ spin_unlock_irqrestore(&ks->statelock, flags);
return IRQ_NONE;
@@ -546,6 +549,7 @@ static irqreturn_t ks_irq(int irq, void *pw)
/* this should be the last in IRQ handler*/
+ spin_unlock_irqrestore(&ks->statelock, flags);
@@ -615,6 +619,7 @@ static int ks_net_stop(struct net_device *netdev)
/* shutdown RX/TX QMU */
+ ks_disable_int(ks);
/* set powermode to soft power down to save power */
ks_set_powermode(ks, PMECR_PM_SOFTDOWN);
@@ -671,10 +676,9 @@ static netdev_tx_t ks_start_xmit(struct sk_buff *skb, struct net_device *netdev)
netdev_tx_t retv = NETDEV_TX_OK;
struct ks_net *ks = netdev_priv(netdev);
+ unsigned long flags;
- disable_irq(netdev->irq);
- ks_disable_int(ks);
- spin_lock(&ks->statelock);
+ spin_lock_irqsave(&ks->statelock, flags);
/* Extra space are required:
* 4 byte for alignment, 4 for status/length, 4 for CRC
@@ -688,9 +692,7 @@ static netdev_tx_t ks_start_xmit(struct sk_buff *skb, struct net_device *netdev)
} else
- spin_unlock(&ks->statelock);
- ks_enable_int(ks);
- enable_irq(netdev->irq);
+ spin_unlock_irqrestore(&ks->statelock, flags);
return retv;