drm/i915: Don't oops during modeset shutdown after lpe audio deinit

We deinit the lpe audio device before we call
drm_atomic_helper_shutdown(), which means the platform device
may already be gone when it comes time to shut down the crtc.
As we don't know when the last reference to the platform
device gets dropped by the audio driver we can't assume that
the device and its data are still around when turning off the
crtc. Mark the platform device as gone as soon as we do the
audio deinit.

Cc: [email protected]
Signed-off-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Chris Wilson <[email protected]>
(cherry picked from commit f45a7977d1140c11f334e01a9f77177ed68e3bfa)
Signed-off-by: Joonas Lahtinen <[email protected]>

diff --git a/drivers/gpu/drm/i915/intel_lpe_audio.c b/drivers/gpu/drm/i915/intel_lpe_audio.c
index cdf19553ffacd28f1097bb2096b8cc35d4654b84..5d5336fbe7b05836b7bedc28bffbfef9e6b08b4f 100644 (file)
--- a/drivers/gpu/drm/i915/intel_lpe_audio.c
+++ b/drivers/gpu/drm/i915/intel_lpe_audio.c
@@ -297,8 +297,10 @@ void intel_lpe_audio_teardown(struct drm_i915_private *dev_priv)
        lpe_audio_platdev_destroy(dev_priv);
 
        irq_free_desc(dev_priv->lpe_audio.irq);
-}
 
+       dev_priv->lpe_audio.irq = -1;
+       dev_priv->lpe_audio.platdev = NULL;
+}
 
 /**
  * intel_lpe_audio_notify() - notify lpe audio event