patches.renesas/0525-sh_eth-fix-napi_-en-dis-able-calls-racing-against-in.patch

From 63a25646ed48425f7cfd4bd4f8d77db134e50a80 Mon Sep 17 00:00:00 2001
From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Date: Wed, 4 Sep 2013 02:41:27 +0400
Subject: sh_eth: fix napi_{en|dis}able() calls racing against interrupts

While implementing NAPI for the driver, I overlooked the race conditions where
interrupt  handler might have called napi_schedule_prep() before napi_enable()
was called or after napi_disable() was called. If RX interrupt happens, this
would cause the endless interrupts and messages like:

sh-eth eth0: ignoring interrupt, status 0x00040000, mask 0x01ff009f.

The interrupt wouldn't even be masked by the kernel eventually since the handler
would return IRQ_HANDLED all the time.

As a fix, move napi_enable() call before request_irq() call and napi_disable()
call after free_irq() call.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit d2779e99468fd83ef1493c34f3803fec9aad8345)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
 drivers/net/ethernet/renesas/sh_eth.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index 16e7b9b5..dfb208f0 100644
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -1906,11 +1906,13 @@ static int sh_eth_open(struct net_device *ndev)
 
 	pm_runtime_get_sync(&mdp->pdev->dev);
 
+	napi_enable(&mdp->napi);
+
 	ret = request_irq(ndev->irq, sh_eth_interrupt,
 			  mdp->cd->irq_flags, ndev->name, ndev);
 	if (ret) {
 		dev_err(&ndev->dev, "Can not assign IRQ number\n");
-		return ret;
+		goto out_napi_off;
 	}
 
 	/* Descriptor set */
@@ -1928,12 +1930,12 @@ static int sh_eth_open(struct net_device *ndev)
 	if (ret)
 		goto out_free_irq;
 
-	napi_enable(&mdp->napi);
-
 	return ret;
 
 out_free_irq:
 	free_irq(ndev->irq, ndev);
+out_napi_off:
+	napi_disable(&mdp->napi);
 	pm_runtime_put_sync(&mdp->pdev->dev);
 	return ret;
 }
@@ -2025,8 +2027,6 @@ static int sh_eth_close(struct net_device *ndev)
 {
 	struct sh_eth_private *mdp = netdev_priv(ndev);
 
-	napi_disable(&mdp->napi);
-
 	netif_stop_queue(ndev);
 
 	/* Disable interrupts by clearing the interrupt mask. */
@@ -2044,6 +2044,8 @@ static int sh_eth_close(struct net_device *ndev)
 
 	free_irq(ndev->irq, ndev);
 
+	napi_disable(&mdp->napi);
+
 	/* Free all the skbuffs in the Rx queue. */
 	sh_eth_ring_free(ndev);
 
-- 
1.8.4.3.gca3854a