linux-kernel - Re: [PATCH v3] HID: intel-ish-hid: ISH firmware loader client driver

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Date:   Tue, 2 Apr 2019 09:52:32 +0530
From:   Rushikesh S Kadam <rushikesh.s.kadam@...el.com>
To:     Nick Crews <ncrews@...omium.org>
Cc:     Joe Perches <joe@...ches.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        benjamin.tissoires@...hat.com, jikos@...nel.org,
        jettrink@...omium.org, Gwendal Grignou <gwendal@...gle.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-input@...r.kernel.org
Subject: Re: [PATCH v3] HID: intel-ish-hid: ISH firmware loader client driver

Hi Nick, Joe

thanks for your comments

Regards

Rushikesh

On Mon, Apr 01, 2019 at 03:17:13PM -0600, Nick Crews wrote:
> I tried to send the last message from my phone, and surprise it wasn't
> formatted correctly, so it may have been marked as spam. repeating
> myself again...
> 
> Ah, I guess I was wrong about logging OOM. I hadn’t hear about the
> recommendations against it, but they make sense. Thanks for the
> clarifications!
> 
> On Sat, Mar 30, 2019 at 10:27 AM Joe Perches <joe@...ches.com> wrote:
> >
> > On Sat, 2019-03-30 at 15:52 +0530, Rushikesh S Kadam wrote:
> > > On Fri, Mar 29, 2019 at 04:30:18PM -0700, Nick Crews wrote:
> > > > On Fri, Mar 29, 2019 at 1:03 PM Rushikesh S Kadam
> > > > <rushikesh.s.kadam@...el.com> wrote:
> > > > > +       ldr_xfer_ipc_frag = kzalloc(LOADER_SHIM_IPC_BUF_SIZE, GFP_KERNEL);
> > > > > +       if (!ldr_xfer_ipc_frag) {
> > > > Log error here.
> > > The error code is logged in calling function
> > > load_fw_from_host(). Is that good enough?
> > >
> > > I believe the checkpatch script too, would
> > > recommend against adding debug print for ENOMEM
> > > error.
> >
> > The generic kernel allocation functions already do
> > a dump_stack() on OOM conditions when called without
> > __GFP_NOWARN so any additional OOM message isn't
> > particularly useful.
> >
> > > Again, I thought it was against practise to log
> > > "out of memory" debug prints in probe()
> >
> > Or anywhere else given the generic OOM stack dump.
> >
> > > But will add if you tell me this is the right way.
> > >
> > > > > +               return -ENOMEM;
> > > > > +
> > > > > +       loader_ishtp_cl = ishtp_cl_allocate(cl_device);
> > > > > +       if (!loader_ishtp_cl)
> > > >
> > > > log error here
> >
> > The ishtp_cl_allocate function just calls kmalloc then
> > initializes the struct so an additional OOM message
> > isn't useful here either.
> >
> >

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