Received-SPF: pass (google.com: domain of linux-kernel+bounces-56227-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:4601:e00::3 as permitted sender) client-ip=2604:1380:4601:e00::3;
Date: Wed, 7 Feb 2024 09:34:02 +0000
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Joy Chakraborty <joychakr@google.com>
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
	Rob Herring <robh@kernel.org>,
	Nicolas Saenz Julienne <nsaenz@kernel.org>,
	linux-kernel@vger.kernel.org, manugautam@google.com,
	stable@vger.kernel.org
Subject: Re: [PATCH v2] nvmem: rmem: Fix return value of rmem_read()
Message-ID: <2024020734-curliness-licking-44c1@gregkh>
References: <20240206042408.224138-1-joychakr@google.com>
 <2024020647-submarine-lucid-ea7b@gregkh>
 <CAOSNQF3jk+85-P+NB-1w=nQwJr1BBO9OQuLbm6s8PiXrFMQdjg@mail.gmail.com>
 <2024020637-handpick-pamphlet-bacb@gregkh>
 <CAOSNQF2_qy51Z01DKO1MB-d+K4EaXGDkof1T4pHNO10U_Hm0WQ@mail.gmail.com>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CAOSNQF2_qy51Z01DKO1MB-d+K4EaXGDkof1T4pHNO10U_Hm0WQ@mail.gmail.com>

On Tue, Feb 06, 2024 at 05:22:15PM +0530, Joy Chakraborty wrote:
> > > Userspace will see a false error with nvmem cell reads from
> > > nvmem_cell_attr_read() in current code, which should be fixed on
> > > returning 0 for success.
> >
> > So maybe fix this all up to allow the read to return the actual amount
> > read?  That feels more "correct" to me.
> >
> 
> If I change the behavior of the nvmem_reg_read_t callback to negative
> for error and number of bytes actually read for success then, other
> than the core driver I would also have to change all the
> nvmem-provider drivers.
> Is it okay to do so ?

Sure, why not?  That seems like the correct fix to me, right?

thanks,

greg k-h