linux-kernel - Re: [PATCH 5/5] nvmem: Add support for write-only instances

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Message-ID: <20200324133352.GA2503959@kroah.com>
Date:   Tue, 24 Mar 2020 14:33:52 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] nvmem: Add support for write-only instances

On Tue, Mar 24, 2020 at 01:25:46PM +0000, Srinivas Kandagatla wrote:
> 
> 
> On 24/03/2020 12:29, Greg KH wrote:
> > > But the Idea here is :
> > > We ended up with providing different options like read-only,root-only to
> > > nvmem providers combined with read/write callbacks.
> > > With that, there are some cases which are totally invalid, existing code
> > > does very minimal check to ensure that before populating with correct
> > > attributes to sysfs file. One of such case is with thunderbolt provider
> > > which supports only write callback.
> > > 
> > > With this new checks in place these flags and callbacks are correctly
> > > validated, would result in correct file attributes.
> > Why this crazy set of different groups?  You can set the mode of a sysfs
> > file in the callback for when the file is about to be created, that's so
> > much simpler and is what it is for.  This feels really hacky and almost
> > impossible to follow:(
> Thanks for the inputs, That definitely sounds much simpler to deal with.
> 
> Am guessing you are referring to is_bin_visible callback?

Yes.