linux-kernel - [PATCH 5.18 029/231] drm/panfrost: Put mapping instead of shmem obj on panfrost_mmu_map_fault

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Message-Id: <20220719114716.520551515@linuxfoundation.org>
Date:   Tue, 19 Jul 2022 13:51:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Steven Price <steven.price@....com>,
        Dmitry Osipenko <dmitry.osipenko@...labora.com>
Subject: [PATCH 5.18 029/231] drm/panfrost: Put mapping instead of shmem obj on panfrost_mmu_map_fault_addr() error

From: Dmitry Osipenko <dmitry.osipenko@...labora.com>

commit fb6e0637ab7ebd8e61fe24f4d663c4bae99cfa62 upstream.

When panfrost_mmu_map_fault_addr() fails, the BO's mapping should be
unreferenced and not the shmem object which backs the mapping.

Cc: stable@...r.kernel.org
Fixes: bdefca2d8dc0 ("drm/panfrost: Add the panfrost_gem_mapping concept")
Reviewed-by: Steven Price <steven.price@....com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
Signed-off-by: Steven Price <steven.price@....com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220630200601.1884120-2-dmitry.osipenko@collabora.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/panfrost/panfrost_mmu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
@@ -518,7 +518,7 @@ err_map:
 err_pages:
 	drm_gem_shmem_put_pages(&bo->base);
 err_bo:
-	drm_gem_object_put(&bo->base.base);
+	panfrost_gem_mapping_put(bomapping);
 	return ret;
 }