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| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2015-02-22 11:38:36 +0100 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2015-02-24 02:05:20 +0100 |
| commit | 2caa80e72b57c6216aec6f6a11fcfb4fec46daa0 (patch) | |
| tree | f794336439343e60ef1879223840174fe1706c77 /drivers/gpu/drm | |
| parent | Linux 4.0-rc1 (diff) | |
| download | linux-2caa80e72b57c6216aec6f6a11fcfb4fec46daa0.tar.xz linux-2caa80e72b57c6216aec6f6a11fcfb4fec46daa0.zip | |
drm: Fix deadlock due to getconnector locking changes
In commit ccfc08655d5fd5076828f45fb09194c070f2f63a
Author: Rob Clark <robdclark@gmail.com>
Date: Thu Dec 18 16:01:48 2014 -0500
drm: tweak getconnector locking
We need to extend the locking to cover connector->state reading for
atomic drivers, but the above commit was a bit too eager and also
included the fill_modes callback. Which on i915 on old platforms using
load detection needs to acquire modeset locks, resulting in a deadlock
on output probing.
Reported-by: Marc Finet <m.dreadlock@gmail.com>
Cc: Marc Finet <m.dreadlock@gmail.com>
Cc: robdclark@gmail.com
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/drm_crtc.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 6b00173d1be4..6b6b07ff720b 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -2127,7 +2127,6 @@ int drm_mode_getconnector(struct drm_device *dev, void *data, DRM_DEBUG_KMS("[CONNECTOR:%d:?]\n", out_resp->connector_id); mutex_lock(&dev->mode_config.mutex); - drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); connector = drm_connector_find(dev, out_resp->connector_id); if (!connector) { @@ -2157,6 +2156,8 @@ int drm_mode_getconnector(struct drm_device *dev, void *data, out_resp->mm_height = connector->display_info.height_mm; out_resp->subpixel = connector->display_info.subpixel_order; out_resp->connection = connector->status; + + drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); encoder = drm_connector_get_encoder(connector); if (encoder) out_resp->encoder_id = encoder->base.id; |