linux-kernel - Re: drm/amdgpu: remove the redundant null check

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Date:   Wed, 4 Sep 2019 19:50:35 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     zhong jiang <zhongjiang@...wei.com>,
        Chunming Zhou <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: drm/amdgpu: remove the redundant null check

> debugfs_remove and kfree has taken the null check in account.
> hence it is unnecessary to check it. Just remove the condition.

How do you think about a wording like the following?

  The functions “debugfs_remove” and “kfree” tolerate the passing
  of null pointers. Hence it is unnecessary to check such arguments
  around the calls. Thus remove the extra condition check at two places.

> No functional change.

I find this information questionable while it is partly reasonable
according to the shown software refactoring.

Can a subject like “[PATCH] drm/amdgpu: Remove two redundant
null pointer checks” be nicer here?

Were any source code analysis tools involved for finding
these update candidates?

Regards,
Markus