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Date: Tue, 22 Oct 2013 00:33:28 +0200 From: David Herrmann <dh.herrmann@...il.com> To: dri-devel@...ts.freedesktop.org Cc: linux-kernel@...r.kernel.org, Dave Airlie <airlied@...il.com>, David Herrmann <dh.herrmann@...il.com> Subject: [RFC v2 6/6] drm: zap mmaps for dead devices Once a DRM device is unregistered, user-space must not access any existing mmaps, anymore. As we cannot rely on this, we now zap all of them in drm_dev_unregister(). Any driver which wants to support that needs to protect their fault() and mmap() handlers via drm_dev_get_active(), otherwise users can create new mmaps after/during drm_dev_unregister(). Signed-off-by: David Herrmann <dh.herrmann@...il.com> --- drivers/gpu/drm/drm_stub.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/drm_stub.c b/drivers/gpu/drm/drm_stub.c index e363b72..274a005 100644 --- a/drivers/gpu/drm/drm_stub.c +++ b/drivers/gpu/drm/drm_stub.c @@ -602,6 +602,10 @@ void drm_dev_unregister(struct drm_device *dev) drm_dev_shutdown(dev); + /* zap all memory mappings (drm_global_mutex must not be locked) */ + if (dev->dev_mapping) + unmap_mapping_range(dev->dev_mapping, 0, LLONG_MAX, 1); + /* We cannot hold drm_global_mutex during drm_dev_shutdown() as it might * dead-lock. Hence, there's a small race between drm_dev_shutdown() and * us locking drm_global_mutex which drm_release() might trigger. To fix -- 1.8.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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