Messages in this thread | | | From | Grant Likely <> | Subject | Re: [PATCH RESEND 4/6 v13] gpiolib: Fix default attributes for class | Date | Fri, 15 Feb 2013 22:55:14 +0000 |
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On Tue, 15 Jan 2013 12:51:54 +0100, Roland Stigge <stigge@antcom.de> wrote: > There is a race condition between creating a gpio or gpiochip device and adding > default attributes. This patch fixes this by defining the default attributes as > dev_attrs of the class. For this, it was necessary to create a separate > gpiochip_class besides gpio_class. > > Signed-off-by: Roland Stigge <stigge@antcom.de>
Hi Roland,
Yup, that's a bug. Thanks for looking at this. Unfortunately creating a new class creates a new problem because it changes the userspace ABI (the gpiochip simlinks move to a different class directory).
Instead, I think the correct solution here is to use (struct device *)->groups to add attributes to a device. Unfortunately that means that create_device() won't work anymore. It does some useful setup work though that I don't want to have to reproduce. You could create a variant that also allows groups to be set, or you could factor out the allocation/setup stuff so we can do an allocate/fixup/register sequence.
g.
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