linux-kernel - Re: [PATCH] optee: simplify i2c access

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Message-ID: <20210208074631.GA27508@trex>
Date:   Mon, 8 Feb 2021 08:46:31 +0100
From:   "Jorge Ramirez-Ortiz, Foundries" <jorge@...ndries.io>
To:     Jens Wiklander <jens.wiklander@...aro.org>
Cc:     Jorge Ramirez-Ortiz <jorge@...ndries.io>,
        Arnd Bergmann <arnd@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        op-tee@...ts.trustedfirmware.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] optee: simplify i2c access

On 08/02/21, Jens Wiklander wrote:
> Hi Jorge,
> 
> On Wed, Jan 27, 2021 at 11:41 AM Jens Wiklander
> <jens.wiklander@...aro.org> wrote:
> >
> > Hi Arnd,
> >
> > On Mon, Jan 25, 2021 at 12:38 PM Arnd Bergmann <arnd@...nel.org> wrote:
> > >
> > > From: Arnd Bergmann <arnd@...db.de>
> > >
> > > Storing a bogus i2c_client structure on the stack adds overhead and
> > > causes a compile-time warning:
> > >
> > > drivers/tee/optee/rpc.c:493:6: error: stack frame size of 1056 bytes in function 'optee_handle_rpc' [-Werror,-Wframe-larger-than=]
> > > void optee_handle_rpc(struct tee_context *ctx, struct optee_rpc_param *param,
> > >
> > > Change the implementation of handle_rpc_func_cmd_i2c_transfer() to
> > > open-code the i2c_transfer() call, which makes it easier to read
> > > and avoids the warning.
> > >
> > > Fixes: c05210ab9757 ("drivers: optee: allow op-tee to access devices on the i2c bus")
> > > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > > ---
> > >  drivers/tee/optee/rpc.c | 31 ++++++++++++++++---------------
> > >  1 file changed, 16 insertions(+), 15 deletions(-)
> >
> > Looks good to me.
> > Reviewed-by: Jens Wiklander <jens.wiklander@...aro.org>
> 
> Would you mind testing this?

sure, doing it this morning.

btw what Arnd has done - removing the unnecessary level of indirection
- was pretty much my initial though but I thought it was easier to
read the way I wrote it (I guess I was wrong and I obviously missed
the stack size increase)

but yes, will test

> 
> Thanks,
> Jens