devm_kmalloc
dst = devm_kmalloc(dev, len, gfp);
devm_kmalloc((_dev), (_size), (_gfp) | __GFP_ZERO)
devm_kmalloc((_dev), ((_sizen) * (_size)), (_gfp) | __GFP_ZERO)
p = devm_kmalloc(dev, len + 1, gfp);