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net/cpsw: make sure modules remove does not leak any ressources 

This driver does not clean up properly after leaving. Here is a list:
- Use unregister_netdev(). free_netdev() is good but not enough
- Use the above also on the other ndev in case of dual mac
- Free data.slave_data. The name of the strucre makes it look like
  it is platform_data but it is not. It is just a trick!
- Free all irqs. Again: freeing one irq is good start, but freeing all
  of them is better.

With this rmmod & modprobe of cpsw seems to work. The remaining issue
is:
|WARNING: at fs/sysfs/dir.c:536 sysfs_add_one+0x9c/0xd4()
|sysfs: cannot create duplicate filename '/devices/ocp.2/4a100000.ethernet/4a101000.mdio'
|WARNING: at lib/kobject.c:196 kobject_add_internal+0x1a4/0x1c8()

comming from of_platform_populate() and I am not sure that this belongs
here.

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>
This commit is contained in:
Sebastian Siewior 2013-04-24 08:48:23 +00:00 committed by David S. Miller
parent 4bc21d4162
commit d1bd9acfa3
1 changed files with 16 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/net/ethernet/ti/cpsw.c
View File

@ -1632,7 +1632,7 @@ static int cpsw_probe_dual_emac(struct platform_device *pdev,
static int cpsw_probe(struct platform_device *pdev)
{
struct cpsw_platform_data *data = pdev->dev.platform_data;
struct cpsw_platform_data *data;
struct net_device *ndev;
struct cpsw_priv *priv;
struct cpdma_params dma_params;
@ -1845,7 +1845,7 @@ static int cpsw_probe(struct platform_device *pdev)
goto clean_ale_ret;
}
priv->irqs_table[k] = i;
priv->num_irqs = k;
priv->num_irqs = k + 1;
}
k++;
}
@ -1883,7 +1883,8 @@ static int cpsw_probe(struct platform_device *pdev)
return 0;
clean_irq_ret:
free_irq(ndev->irq, priv);
for (i = 0; i < priv->num_irqs; i++)
free_irq(priv->irqs_table[i], priv);
clean_ale_ret:
cpsw_ale_destroy(priv->ale);
clean_dma_ret:
@ -1906,7 +1907,8 @@ clean_slave_ret:
pm_runtime_disable(&pdev->dev);
kfree(priv->slaves);
clean_ndev_ret:
free_netdev(ndev);
kfree(priv->data.slave_data);
free_netdev(priv->ndev);
return ret;
}
@ -1914,12 +1916,17 @@ static int cpsw_remove(struct platform_device *pdev)
{
struct net_device *ndev = platform_get_drvdata(pdev);
struct cpsw_priv *priv = netdev_priv(ndev);
int i;
pr_info("removing device");
platform_set_drvdata(pdev, NULL);
if (priv->data.dual_emac)
unregister_netdev(cpsw_get_slave_ndev(priv, 1));
unregister_netdev(ndev);
cpts_unregister(priv->cpts);
free_irq(ndev->irq, priv);
for (i = 0; i < priv->num_irqs; i++)
free_irq(priv->irqs_table[i], priv);
cpsw_ale_destroy(priv->ale);
cpdma_chan_destroy(priv->txch);
cpdma_chan_destroy(priv->rxch);
@ -1933,8 +1940,10 @@ static int cpsw_remove(struct platform_device *pdev)
pm_runtime_disable(&pdev->dev);
clk_put(priv->clk);
kfree(priv->slaves);
kfree(priv->data.slave_data);
if (priv->data.dual_emac)
free_netdev(cpsw_get_slave_ndev(priv, 1));
free_netdev(ndev);
return 0;
}