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Date: Tue, 4 Mar 2014 15:07:41 +0100
From: Christian Riesch <christian.riesch@...cron.at>
To: <netdev@...r.kernel.org>
CC: Jon Ringle <jon@...gle.org>,
<davinci-linux-open-source@...ux.davincidsp.com>,
Christian Riesch <christian.riesch@...cron.at>,
"Lad, Prabhakar" <prabhakar.csengg@...il.com>,
<stable@...r.kernel.org>
Subject: [PATCH] net: davinci_emac: Move call of devm_request_irq to emac_dev_open
In commit 6892b41d9701283085b655c6086fb57a5d63fa47
Author: Lad, Prabhakar <prabhakar.csengg@...il.com>
Date: Tue Jun 25 21:24:51 2013 +0530
net: davinci: emac: Convert to devm_* api
the call of request_irq is replaced by devm_request_irq and the call
of free_irq is removed. But since interrupts are requested in
emac_dev_open, doing ifconfig up/down on the board requests the
interrupts again each time, causing devm_request_irq to fail.
This patch moves the interrupt requests to emac_dev_open and thus
fixes this regression.
Reported-by: Jon Ringle <jon@...gle.org>
Signed-off-by: Christian Riesch <christian.riesch@...cron.at>
Cc: Lad, Prabhakar <prabhakar.csengg@...il.com>
Cc: <stable@...r.kernel.org>
---
Hi,
This is an attempt to fix the bug discussed in
https://lkml.org/lkml/2014/3/4/218
Since I am not really familiar with interrupts I am not sure if this is the right way to
do it. I am looking forward to your comments.
Christian
drivers/net/ethernet/ti/davinci_emac.c | 32 ++++++++++++++++----------------
1 file changed, 16 insertions(+), 16 deletions(-)
diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c
index cd9b164..97c6036 100644
--- a/drivers/net/ethernet/ti/davinci_emac.c
+++ b/drivers/net/ethernet/ti/davinci_emac.c
@@ -1531,10 +1531,8 @@ static int emac_dev_open(struct net_device *ndev)
{
struct device *emac_dev = &ndev->dev;
u32 cnt;
- struct resource *res;
int ret;
int i = 0;
- int k = 0;
struct emac_priv *priv = netdev_priv(ndev);
pm_runtime_get(&priv->pdev->dev);
@@ -1563,16 +1561,6 @@ static int emac_dev_open(struct net_device *ndev)
break;
}
- /* Request IRQ */
-
- while ((res = platform_get_resource(priv->pdev, IORESOURCE_IRQ, k))) {
- for (i = res->start; i <= res->end; i++) {
- if (devm_request_irq(&priv->pdev->dev, i, emac_irq,
- 0, ndev->name, ndev))
- goto rollback;
- }
- k++;
- }
/* Start/Enable EMAC hardware */
emac_hw_enable(priv);
@@ -1639,10 +1627,6 @@ static int emac_dev_open(struct net_device *ndev)
return 0;
-rollback:
-
- dev_err(emac_dev, "DaVinci EMAC: devm_request_irq() failed");
- ret = -EBUSY;
err:
pm_runtime_put(&priv->pdev->dev);
return ret;
@@ -1839,6 +1823,8 @@ static int davinci_emac_probe(struct platform_device *pdev)
struct clk *emac_clk;
unsigned long emac_bus_frequency;
+ int k = 0;
+ int i = 0;
/* obtain emac clock from kernel */
emac_clk = devm_clk_get(&pdev->dev, NULL);
@@ -1968,11 +1954,25 @@ static int davinci_emac_probe(struct platform_device *pdev)
(void *)priv->emac_base_phys, ndev->irq);
}
+ /* Request IRQ */
+ while ((res = platform_get_resource(priv->pdev, IORESOURCE_IRQ, k))) {
+ for (i = res->start; i <= res->end; i++) {
+ if (devm_request_irq(&priv->pdev->dev, i, emac_irq,
+ 0, ndev->name, ndev))
+ goto no_irq;
+ }
+ k++;
+ }
+
pm_runtime_enable(&pdev->dev);
pm_runtime_resume(&pdev->dev);
return 0;
+no_irq:
+ dev_err(emac_dev, "DaVinci EMAC: devm_request_irq() failed");
+ rc = -EBUSY;
+
no_cpdma_chan:
if (priv->txchan)
cpdma_chan_destroy(priv->txchan);
--
1.7.9.5
--
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