linux-kernel - Re: [PATCH v19 17/30] drm/panfrost: Fix the error path in panfrost_mmu_map_fault

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Date: Fri, 26 Jan 2024 10:08:01 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Dmitry Osipenko <dmitry.osipenko@...labora.com>,
 David Airlie <airlied@...il.com>, Gerd Hoffmann <kraxel@...hat.com>,
 Gurchetan Singh <gurchetansingh@...omium.org>, Chia-I Wu
 <olvaffe@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 Christian König <christian.koenig@....com>,
 Qiang Yu <yuq825@...il.com>, Steven Price <steven.price@....com>,
 Boris Brezillon <boris.brezillon@...labora.com>,
 Emma Anholt <emma@...olt.net>, Melissa Wen <mwen@...lia.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 kernel@...labora.com, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v19 17/30] drm/panfrost: Fix the error path in
 panfrost_mmu_map_fault_addr()

Il 05/01/24 19:46, Dmitry Osipenko ha scritto:
> From: Boris Brezillon <boris.brezillon@...labora.com>
> 
> If some the pages or sgt allocation failed, we shouldn't release the
> pages ref we got earlier, otherwise we will end up with unbalanced
> get/put_pages() calls. We should instead leave everything in place
> and let the BO release function deal with extra cleanup when the object
> is destroyed, or let the fault handler try again next time it's called.
> 
> Fixes: 187d2929206e ("drm/panfrost: Add support for GPU heap allocations")
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Boris Brezillon <boris.brezillon@...labora.com>
> Co-developed-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>