ax25: use GFP_KERNEL in ax25_dev_device_up()

ax25_dev_device_up() is only called during device setup, which is
done in user context. In addition, ax25_dev_device_up()
unconditionally calls ax25_register_dev_sysctl(), which already
allocates with GFP_KERNEL.

Since it is allowed to sleep in this function, here we change
ax25_dev_device_up() to use GFP_KERNEL to reduce unnecessary
out-of-memory errors.

Reported-by: Dan Carpenter <[email protected]>
Signed-off-by: Peter Lafreniere <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

net/ax25/ax25_dev.c

@@ -52,15 +52,16 @@ void ax25_dev_device_up(struct net_device *dev)
 {
  ax25_dev *ax25_dev;
 
- if ((ax25_dev = kzalloc(sizeof(*ax25_dev), GFP_ATOMIC)) == NULL) {
+ ax25_dev = kzalloc(sizeof(*ax25_dev), GFP_KERNEL);
+ if (!ax25_dev) {
  printk(KERN_ERR "AX.25: ax25_dev_device_up - out of memory\n");
  return;
  }
 
  refcount_set(&ax25_dev->refcount, 1);
  dev->ax25_ptr = ax25_dev;
  ax25_dev->dev = dev;
- netdev_hold(dev, &ax25_dev->dev_tracker, GFP_ATOMIC);
+ netdev_hold(dev, &ax25_dev->dev_tracker, GFP_KERNEL);
  ax25_dev->forward = NULL;
  ax25_dev->device_up = true;