linux-kernel - Re: [PATCH v2] mfd: intel-lpss: Add missing check for platform_get

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Date:   Thu, 30 Nov 2023 11:35:17 +0000
From:   Lee Jones <lee@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...el.com>
Cc:     Jiasheng Jiang <jiasheng@...as.ac.cn>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mfd: intel-lpss: Add missing check for
 platform_get_resource

On Mon, 27 Nov 2023, Andy Shevchenko wrote:

> On Mon, Nov 27, 2023 at 08:53:56AM +0000, Lee Jones wrote:
> > On Fri, 24 Nov 2023, Andy Shevchenko wrote:
> > > On Fri, Jun 09, 2023 at 09:48:18AM +0800, Jiasheng Jiang wrote:
> 
> ...
> 
> > > > Fixes: 4b45efe85263 ("mfd: Add support for Intel Sunrisepoint LPSS devices")
> > > 
> > > This does not fix anything and just introduces a duplication code.
> > > I would like this to be reverted. Should I send one?
> > 
> > Checking this value at the source of obtention and providing and earlier
> > return with arguably a better return value, all at the cost of an
> > inexpensive pointer comparison to NULL doesn't sound like a terrible
> > idea.
> 
> In general, I agree with you, but the cases similar to this. Why?
> Because memory resource retrieval and remapping has a lot of helpers,
> some of which are enriched with own error handling and messaging.
> 
> Yes, we use devm_ioremap_uc(), which doesn't give that (yet?).
> However, it will be more work if we, theoretically, switch to
> something like devm_ioremap_resource() in the future.
> 
> Hence, I would like to have a common code to be in common place
> and behave in the same way independently on the glue druver (PCI,
> ACPI, etc).
> 
> > If you were committed to the idea of removing it, which I suggest you
> > reconsider, I would insist that you replace it with at least a comment.
> 
> Isn't what I have done in the series I sent last week?

You have to send links when you say things like this.

Last week I had 1000 unread upstream mails in this inbox.

-- 
Lee Jones [李琼斯]