On Thu, May 16, 2013 at 01:15:28PM +0200, Wolfram Sang wrote: > Lately, I have been experimenting how to improve the devm interface to make > writing device drivers easier and less error prone while also getting rid of > its subtle issues. I think it has more potential but still needs work and > definately conistency, especiall in its usage. > > The first thing I come up with is a low hanging fruit regarding > devm_ioremap_resouce(). This function already checks if the passed resource is > valid and gives an error message if not. So, we can remove similar checks from > the drivers and get rid of a bit of code and a number of inconsistent error > strings. Sorry for jumping in so late. I generally like the idea. One small inconvenience is that devm_ioremap_resource() returns -EINVAL if res == NULL, which means that drivers will now also return -EINVAL in cases where no resource was returned. Typically drivers handle this by returning something like -ENODEV, -ENXIO, -ENOENT. Some do return -EINVAL but perhaps having a separate error code (and maybe error message as well) for a missing resource would be helpful. Doing this would be rather easy now that you've paved the way by making devm_ioremap_resource() usage consistent across drivers. Thierry
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