linux-kernel - Re: [PATCH v2 2/3] drm: Add a drm_gem_objects

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Date:   Mon, 01 Apr 2019 14:48:16 +0100
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     Daniel Vetter <daniel@...ll.ch>, Rob Herring <robh@...nel.org>
Cc:     Sean Paul <sean@...rly.run>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Will Deacon <will.deacon@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        David Airlie <airlied@...ux.ie>,
        "list@....net:IOMMU DRIVERS <iommu@...ts.linux-foundation.org>, Joerg
        Roedel <joro@...tes.org>, " <iommu@...ts.linux-foundation.org>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Robin Murphy <robin.murphy@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 2/3] drm: Add a drm_gem_objects_lookup helper

Quoting Daniel Vetter (2019-04-01 14:06:48)
> On Mon, Apr 1, 2019 at 9:47 AM Rob Herring <robh@...nel.org> wrote:
> > +{
> > +       int i, ret = 0;
> > +       struct drm_gem_object *obj;
> > +
> > +       spin_lock(&filp->table_lock);
> > +
> > +       for (i = 0; i < count; i++) {
> > +               /* Check if we currently have a reference on the object */
> > +               obj = idr_find(&filp->object_idr, handle[i]);
> > +               if (!obj) {
> > +                       ret = -ENOENT;

Unwind previous drm_gem_object_get(), the caller has no idea how many
were processed before the error.
-Chris