Re: [PATCH -next] iio: core: fix missing mutex_unlock() in iio_device_claim_buffer_mode()

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On Fri, Nov 4, 2022 at 1:11 PM Nuno Sá <noname.nuno@xxxxxxxxx> wrote:
> On Fri, 2022-11-04 at 11:54 +0200, Andy Shevchenko wrote:
> > On Fri, Nov 4, 2022 at 11:05 AM Peng Wu <wupeng58@xxxxxxxxxx> wrote:
> > >
> > > In the success path of iio_device_claim_buffer_mode(),
> > > mutex_unlock()
> > > should be called before return.
> >
> > Please, understand how the code works.
> > NAK.
> >
> > Nuno, perhaps we need to put a comment inside the function to explain
> > this?
> >
>
> Hmm... I guess we can do that but, honestly, the docs in the function
> should be pretty straight. Maybe saying that it's supposed to work as
> iio_device_claim_direct_mode() would help (as that one is familiar)...
>
> Alternatively, having sparse annotations could also make it more easy
> to understand the intent.

Maybe simply

/* Yes, we leave it locked here */

before return 0; would suffice?

-- 
With Best Regards,
Andy Shevchenko




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