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net: dsa: exit probe if no switch were found

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If no switch were found in dsa_setup_dst, return -ENODEV and
exit the dsa_probe cleanly.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Neil Armstrong 2015-10-06 15:40:43 +01:00 committed by David S. Miller
parent d4ac35d6ed
commit 4d7f3e757c
1 changed files with 16 additions and 3 deletions
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19
net/dsa/dsa.c
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@ -837,10 +837,11 @@ static inline void dsa_of_remove(struct device *dev)
}
#endif
static void dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
struct device *parent, struct dsa_platform_data *pd)
static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
struct device *parent, struct dsa_platform_data *pd)
{
int i;
unsigned configured = 0;
dst->pd = pd;
dst->master_netdev = dev;
@ -860,8 +861,16 @@ static void dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
dst->ds[i] = ds;
if (ds->drv->poll_link != NULL)
dst->link_poll_needed = 1;
++configured;
}
/*
* If no switch was found, exit cleanly
*/
if (!configured)
return -EPROBE_DEFER;
/*
* If we use a tagging format that doesn't have an ethertype
* field, make sure that all packets from this point on get
@ -878,6 +887,8 @@ static void dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
add_timer(&dst->link_poll_timer);
}
return 0;
}
static int dsa_probe(struct platform_device *pdev)
@ -927,7 +938,9 @@ static int dsa_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, dst);
dsa_setup_dst(dst, dev, &pdev->dev, pd);
ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
if (ret)
goto out;
return 0;