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rb532: Backport fix to resolve oops during korina_restart

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Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
This commit is contained in:
Florian Fainelli 2016-12-23 20:35:59 -08:00 committed by Felix Fietkau
parent 7a340a5cd0
commit 002264d5b1
1 changed files with 56 additions and 0 deletions
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56
target/linux/rb532/patches-4.4/100-korina_fix_napi_disable.patch Normal file
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@ -0,0 +1,56 @@
From 5833532b49820aa221248f296c207cc50d20ca2d Mon Sep 17 00:00:00 2001
From: Florian Fainelli <f.fainelli@gmail.com>
Date: Fri, 23 Dec 2016 19:36:31 -0800
Subject: [PATCH net] net: korina: Fix NAPI versus resources freeing
Commit beb0babfb77e ("korina: disable napi on close and restart")
introduced calls to napi_disable() that were missing before,
unfortunately this leaves a small window during which NAPI has a chance
to run, yet we just freed resources since korina_free_ring() has been
called:
Fix this by disabling NAPI first then freeing resource, and make sure
that we also cancel the restart taks before doing the resource freeing.
Fixes: beb0babfb77e ("korina: disable napi on close and restart")
Reported-by: Alexandros C. Couloumbis <alex@ozo.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
drivers/net/ethernet/korina.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/korina.c b/drivers/net/ethernet/korina.c
index cbeea915f026..8037426ec50f 100644
--- a/drivers/net/ethernet/korina.c
+++ b/drivers/net/ethernet/korina.c
@@ -900,10 +900,10 @@ static void korina_restart_task(struct work_struct *work)
DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR,
&lp->rx_dma_regs->dmasm);
- korina_free_ring(dev);
-
napi_disable(&lp->napi);
+ korina_free_ring(dev);
+
if (korina_init(dev) < 0) {
printk(KERN_ERR "%s: cannot restart device\n", dev->name);
return;
@@ -1064,12 +1064,12 @@ static int korina_close(struct net_device *dev)
tmp = tmp | DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR;
writel(tmp, &lp->rx_dma_regs->dmasm);
- korina_free_ring(dev);
-
napi_disable(&lp->napi);
cancel_work_sync(&lp->restart_task);
+ korina_free_ring(dev);
+
free_irq(lp->rx_irq, dev);
free_irq(lp->tx_irq, dev);
free_irq(lp->ovr_irq, dev);
--
2.9.3