[PATCH v2 net] ionic: catch failure from devlink_alloc

[Shannon Nelson <shannon.nelson@amd.com>]

Add a check for NULL on the alloc return.  If devlink_alloc() fails and
we try to use devlink_priv() on the NULL return, the kernel gets very
unhappy and panics. With this fix, the driver load will still fail,
but at least it won't panic the kernel.

Fixes: df69ba43217d ("ionic: Add basic framework for IONIC Network device driver")
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
---
v2 - fixed up the Fixes tag - thanks, Simon
	https://lore.kernel.org/netdev/Y%2F8tj+bqGG1g5InQ@vergenet.net/

 drivers/net/ethernet/pensando/ionic/ionic_devlink.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_devlink.c b/drivers/net/ethernet/pensando/ionic/ionic_devlink.c
index e6ff757895ab..4ec66a6be073 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_devlink.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_devlink.c
@@ -61,6 +61,8 @@ struct ionic *ionic_devlink_alloc(struct device *dev)
 	struct devlink *dl;
 
 	dl = devlink_alloc(&ionic_dl_ops, sizeof(struct ionic), dev);
+	if (!dl)
+		return NULL;
 
 	return devlink_priv(dl);
 }
-- 
2.17.1