[4.4,150/162] net: ethernet: ti: cpsw: fix extra rx interrupt

Message ID 20191219183216.904800822@linuxfoundation.org
State New
Headers show
Series
  • Untitled series #25854
Related show

Commit Message

Greg Kroah-Hartman Dec. 19, 2019, 6:34 p.m.
From: Grygorii Strashko <grygorii.strashko@ti.com>


[ Upstream commit 51302f77bedab8768b761ed1899c08f89af9e4e2 ]

Now RX interrupt is triggered twice every time, because in
cpsw_rx_interrupt() it is asked first and then disabled. So there will be
pending interrupt always, when RX interrupt is enabled again in NAPI
handler.

Fix it by first disabling IRQ and then do ask.

Fixes: 870915feabdc ("drivers: net: cpsw: remove disable_irq/enable_irq as irq can be masked from cpsw itself")
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>

Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/ethernet/ti/cpsw.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -777,8 +777,8 @@  static irqreturn_t cpsw_rx_interrupt(int
 {
 	struct cpsw_priv *priv = dev_id;
 
-	cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_RX);
 	writel(0, &priv->wr_regs->rx_en);
+	cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_RX);
 
 	if (priv->quirk_irq) {
 		disable_irq_nosync(priv->irqs_table[0]);