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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        =?UTF-8?q?Thomas=20Hellstr=C3=B6m?= 
        <thomas.hellstrom@linux.intel.com>,
        Dmitry Osipenko <dmitry.osipenko@collabora.com>,
        Gerd Hoffmann <kraxel@redhat.com>
Subject: [PATCH 5.19 069/717] drm/virtio: Unlock reservations on dma_resv_reserve_fences() error
Date:   Sat, 22 Oct 2022 09:19:08 +0200
Message-Id: <20221022072427.384315035@linuxfoundation.org>
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From: Dmitry Osipenko <dmitry.osipenko@collabora.com>

commit 0f877398d30e1df657a31a62f7c7de1869b072b5 upstream.

Unlock reservations on dma_resv_reserve_fences() error to fix recursive
locking of the reservations when this error happens.

Cc: stable@vger.kernel.org
Fixes: c8d4c18bfbc4 ("dma-buf/drivers: make reserving a shared slot mandatory v4")
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20220630200726.1884320-5-dmitry.osipenko@collabora.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/virtio/virtgpu_gem.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/virtio/virtgpu_gem.c
+++ b/drivers/gpu/drm/virtio/virtgpu_gem.c
@@ -228,8 +228,10 @@ int virtio_gpu_array_lock_resv(struct vi
 
 	for (i = 0; i < objs->nents; ++i) {
 		ret = dma_resv_reserve_fences(objs->objs[i]->resv, 1);
-		if (ret)
+		if (ret) {
+			virtio_gpu_array_unlock_resv(objs);
 			return ret;
+		}
 	}
 	return ret;
 }