Messages in this thread | | | Date | Thu, 29 Nov 2007 12:06:50 -0500 (EST) | From | Alan Stern <> | Subject | Re: [PATCH] kobject: make sure kobj->ktype is set before kobject_init |
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On Thu, 29 Nov 2007, Kay Sievers wrote:
> > In fact, if we were designing the kobject API from scratch, I'd suggest > > making the ktype value an argument to kobject_init() so that it > > _couldn't_ be omitted. > > Sounds fine, maybe we should also pass the name along, so it will be > obvious what happens here: > int kobject_init(struct kobject *kobj, struct kobj_type *type, const char *fmt, ...)
I don't know... Normally *_init() routines can't fail, but this could. Then things like device_register() would run into trouble: The caller wouldn't know whether a failure occurred before or after the kobject_init() call, so it wouldn't know what sort of cleanup action was needed: kfree() or device_put().
> Oh, if you want to rewind on error and have an initialized but still > unregistered kobject, and just want to free the allocated name by > calling kobject_cleanup() or kobject_put() you might not expect, that > your whole object that embeds the kobject will be gone. Just something > we need to document ...
When that sort of thing happens, the unwinding should be done by the code responsible for whole object. For example, if device_add() fails then the caller should go on to call device_put() rather than kfree(dev).
That's how you would expect things to work in most cases. There aren't many bare kobjects in the kernel.
I agree that documenting this behavior would be good.
Alan Stern
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