linux-kernel - Re: [PATCH v3 01/12] drm: add gem array helpers

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Message-ID: <20190619103212.GA1896@arch-x1c3>
Date:   Wed, 19 Jun 2019 11:32:12 +0100
From:   Emil Velikov <emil.l.velikov@...il.com>
To:     Gerd Hoffmann <kraxel@...hat.com>
Cc:     dri-devel@...ts.freedesktop.org,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        open list <linux-kernel@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>, Sean Paul <sean@...rly.run>
Subject: Re: [PATCH v3 01/12] drm: add gem array helpers

Hi Gerd,

On 2019/06/19, Gerd Hoffmann wrote:

> +/**
> + * drm_gem_array_from_handles -- lookup an array of gem handles.
> + *
> + * @drm_file: drm file-private structure to use for the handle look up
> + * @handles: the array of handles to lookup.
> + * @nents: the numer of handles.
> + *
> + * Returns: An array of gem objects on success, NULL on failure.
> + */
> +struct drm_gem_object_array*
> +drm_gem_array_from_handles(struct drm_file *drm_file, u32 *handles, u32 nents)
> +{
> +	struct drm_gem_object_array *objs;
> +	u32 i;
> +
> +	objs = drm_gem_array_alloc(nents);
> +	if (!objs)
> +		return NULL;
> +
> +	for (i = 0; i < nents; i++) {
> +		objs->objs[i] = drm_gem_object_lookup(drm_file, handles[i]);
> +		if (!objs->objs[i]) {
Missing object put for the 0..i-1 handles. Personally I would:
    objs->nents = i;
    drm_gem_array_put_free(objs);
    return NULL;

> +			drm_gem_array_put_free(objs);
> +			return NULL;
> +		}
> +	}
> +	return objs;
> +}
Missing EXPORT_SYMBOL?

> +
> +/**
> + * drm_gem_array_put_free -- put gem objects and free array.
> + *
> + * @objs: the gem object array.
> + */
> +void drm_gem_array_put_free(struct drm_gem_object_array *objs)
> +{
> +	u32 i;
> +
> +	for (i = 0; i < objs->nents; i++) {
> +		if (!objs->objs[i])
> +			continue;
> +		drm_gem_object_put_unlocked(objs->objs[i]);
> +	}
> +	drm_gem_array_free(objs);
> +}
Ditto?

HTH
Emil