linux-kernel - Re: [PATCH v2] [media] staging/imx: remove confusing IS_ERR_OR

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Date:   Wed, 12 Jul 2017 17:50:05 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Steve Longerbeam <slongerbeam@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Marek Vasut <marex@...x.de>,
        Russell King <rmk+kernel@...linux.org.uk>,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] [media] staging/imx: remove confusing IS_ERR_OR_NULL
 usage

On Tue, 2017-07-11 at 15:18 +0200, Arnd Bergmann wrote:
> While looking at a compiler warning, I noticed the use of
> IS_ERR_OR_NULL, which is generally a sign of a bad API design
> and should be avoided.
> 
> In this driver, this is fairly easy, we can simply stop storing
> error pointers in persistent structures, and change the two
> functions that might return either a NULL pointer or an error
> code to consistently return error pointers when failing.
> 
> of_parse_subdev() now separates the error code and the pointer
> it looks up, to clarify the interface. There are two cases
> where this function originally returns 'NULL', and I have
> changed that to '0' for success to keep the current behavior,
> though returning an error would also make sense there.
> 
> Fixes: e130291212df ("[media] media: Add i.MX media core driver")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> v2: fix type mismatch
> v3: rework of_parse_subdev() as well.

Thanks!

Reviewed-by: Philipp Zabel <p.zabel@...gutronix.de>
Tested-by: Philipp Zabel <p.zabel@...gutronix.de>

regards
Philipp