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authorSebastian Siewior <bigeasy@linutronix.de>2013-04-23 07:31:37 +0000
committerDavid S. Miller <davem@davemloft.net>2013-04-25 04:11:49 -0400
commitfd51cf199421197d14099b4ba382301cc28e5544 (patch)
tree8539a2027985795fce3fa5ac86ac5ce4b14f1c6b
parentaacebbf8026ecdae1b55db3912e65c6b1308f5ed (diff)
net/cpsw: don't rely only on netif_running() to check which device is active
netif_running() reports false before the ->ndo_stop() callback is called. That means if one executes "ifconfig down" and the system receives an interrupt before the interrupt source has been disabled we hang for always for two reasons: - we never disable the interrupt source because devices claim to be already inactive and don't feel responsible. - since the ISR always reports IRQ_HANDLED the line is never deactivated because it looks like the ISR feels responsible. This patch changes the logic in the ISR a little: - If none of the status registers reports an active source (RX or TX, misc is ignored because it is not actived) we leave with IRQ_NONE. - the interrupt is deactivated - The first active network device is taken and napi is scheduled. If none are active (a small race window between ndo_down() and the interrupt the) then we leave and should not come back because the source is off. There is no need to schedule the second NAPI because both share the same dma queue. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Acked-by: Mugunthan V N <mugunthanvnm@ti.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/ethernet/ti/cpsw.c33
1 files changed, 22 insertions, 11 deletions
diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index 5f581bc511b..ff0d528204a 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -510,20 +510,31 @@ void cpsw_rx_handler(void *token, int len, int status)
static irqreturn_t cpsw_interrupt(int irq, void *dev_id)
{
struct cpsw_priv *priv = dev_id;
+ u32 rx, tx, rx_thresh;
- if (likely(netif_running(priv->ndev))) {
- cpsw_intr_disable(priv);
- cpsw_disable_irq(priv);
+ rx_thresh = __raw_readl(&priv->wr_regs->rx_thresh_stat);
+ rx = __raw_readl(&priv->wr_regs->rx_stat);
+ tx = __raw_readl(&priv->wr_regs->tx_stat);
+ if (!rx_thresh && !rx && !tx)
+ return IRQ_NONE;
+
+ cpsw_intr_disable(priv);
+ cpsw_disable_irq(priv);
+
+ if (netif_running(priv->ndev)) {
napi_schedule(&priv->napi);
- } else {
- priv = cpsw_get_slave_priv(priv, 1);
- if (likely(priv) && likely(netif_running(priv->ndev))) {
- cpsw_intr_disable(priv);
- cpsw_disable_irq(priv);
- napi_schedule(&priv->napi);
- }
+ return IRQ_HANDLED;
+ }
+
+ priv = cpsw_get_slave_priv(priv, 1);
+ if (!priv)
+ return IRQ_NONE;
+
+ if (netif_running(priv->ndev)) {
+ napi_schedule(&priv->napi);
+ return IRQ_HANDLED;
}
- return IRQ_HANDLED;
+ return IRQ_NONE;
}
static int cpsw_poll(struct napi_struct *napi, int budget)