linux-kernel - Re: [PATCH v3] drm/panthor: Fix couple of NULL vs IS

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Date: Tue, 2 Apr 2024 17:44:18 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Boris Brezillon <boris.brezillon@...labora.com>
Cc: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>,
	Steven Price <steven.price@....com>,
	Liviu Dudau <liviu.dudau@....com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
	Heiko Stuebner <heiko@...ech.de>,
	Grant Likely <grant.likely@...aro.org>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org, error27@...il.com
Subject: Re: [PATCH v3] drm/panthor: Fix couple of NULL vs IS_ERR() bugs

On Tue, Apr 02, 2024 at 04:38:38PM +0200, Boris Brezillon wrote:
> On Tue,  2 Apr 2024 07:14:11 -0700
> Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com> wrote:
> 
> > Currently panthor_vm_get_heap_pool() returns both ERR_PTR() and
> > NULL(when create is false and if there is no poool attached to the
> 
>                                                ^ pool
> 
> > VM)
> > 	- Change the function to return error pointers, when pool is
> > 	  NULL return -ENOENT
> > 	- Also handle the callers to check for IS_ERR() on failure.
> > 
> > Fixes: 4bdca1150792 ("drm/panthor: Add the driver frontend block")
> 
> I would explain that the code was correct, but the documentation didn't
> match the function behavior, otherwise it feels a bit weird to have a
> Fixes tag here.

The code wasn't correct, it returned a mix of error pointers and NULL.
So it needs a Fixes tag.

regards,
dan carpenter