diff options
| author | Neil Armstrong <narmstrong@baylibre.com> | 2015-10-06 15:40:43 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-10-07 04:56:11 -0700 |
| commit | 4d7f3e757c15051b4521a59791de87ce748c0eb2 (patch) | |
| tree | 67a4fbcc4982a51fc30f692750cb98e3328dac1b /net/dsa | |
| parent | d4ac35d6ed82e6c96ed5c016ea46fad31294fa7a (diff) | |
| download | lwn-4d7f3e757c15051b4521a59791de87ce748c0eb2.tar.gz lwn-4d7f3e757c15051b4521a59791de87ce748c0eb2.zip | |
net: dsa: exit probe if no switch were found
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>
Diffstat (limited to 'net/dsa')
| -rw-r--r-- | net/dsa/dsa.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c index d5a162cda087..adb5325f4934 100644 --- a/net/dsa/dsa.c +++ b/net/dsa/dsa.c @@ -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; @@ -860,9 +861,17 @@ 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 * sent to the tag format's receive function. @@ -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; |