Messages in this thread | | | Date | Sat, 25 Sep 2021 12:40:44 +0200 | From | Len Baker <> | Subject | Re: [PATCH] platform/x86: thinkpad_acpi: Prefer struct_size over open coded arithmetic |
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Hi,
On Tue, Sep 21, 2021 at 05:15:35PM +0200, Greg KH wrote: > > First off, why is a single driver doing so many odd things with > attribute groups? Why not just use them the way that the rest of the > kernel does? Why does this driver need this special handling and no one > else does?
Is [1] the correct way to deal with devices attributes? I think so.
[1] https://www.kernel.org/doc/html/latest/driver-api/driver-model/driver.html#attributes
> > I think the default way of handling if an attribute is enabled or not, > should suffice here, and make things much simpler overall as all of this > crazy attribute handling can just be removed.
Sorry but what is the default way? Would it be correct to check if the file exists?
> > Bonus would also be that I think it would fix the race conditions that > happen when trying to create attributes after the device is bound to the > driver that I think the existing driver has today. > > > > (I see the caller uses +2? Why? It seems to be using each of hotkey_attributes, > > > plus 1 more attr, plus a final NULL?) > > > > The +2 is actually for 2 extra attributes (making the total number > > of extra attributes +3 because the sizeof(struct attribute_set_obj) > > already includes 1 extra). > > > > FWIW these 2 extra attributes are for devices with a > > a physical rfkill on/off switch and for the device being > > a convertible capable of reporting laptop- vs tablet-mode. > > Again, using the default way to show (or not show) attributes should > solve this issue. Why not just use that instead?
What is the default way? Would it be correct to use device_create_file() and device_remove_file()?
Sorry if it is a trivial question but I am a kernel newbie :) I have a lot to learn. Any suggestion or a good driver to look at would be greatly appreciated.
Thanks, Len
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