linux-kernel - Re: [PATCH -next] drm/vgem: Fix return value check in vgem

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Message-ID: <20170521120905.GA7718@nuc-i3427.alporthouse.com>
Date:   Sun, 21 May 2017 13:09:05 +0100
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     Wei Yongjun <weiyj.lk@...il.com>
Cc:     David Airlie <airlied@...ux.ie>, Dave Jiang <dave.jiang@...el.com>,
        Miklos Szeredi <mszeredi@...hat.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Sean Paul <seanpaul@...omium.org>,
        Laura Abbott <labbott@...hat.com>,
        Matthew Auld <matthew.auld@...el.com>,
        Wei Yongjun <weiyongjun1@...wei.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] drm/vgem: Fix return value check in vgem_init()

On Sun, May 21, 2017 at 01:19:39AM +0000, Wei Yongjun wrote:
> From: Wei Yongjun <weiyongjun1@...wei.com>
> 
> In case of error, the function platform_device_register_simple() returns
> ERR_PTR() and never returns NULL. The NULL test in the return value
> check should be replaced with IS_ERR().
> 
> Fixes: 315f0242aa2b ("drm/vgem: Convert to a struct drm_device subclass")

This is wrong, the bug was introduced in
af33a9190d02 ("drm/vgem: Enable dmabuf import interfaces")
not that it matters since it is the same tag.

> Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>

Checked it is an ERR_PTR return on failure, so
Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre