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drm/nouveau: Turn off CRTCs on driver unload

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nouveau leaks a runtime pm ref if at least one CRTC is enabled on
unload. The ref is taken by nouveau_crtc_set_config() and held as long
as a CRTC is in use.

nv04_display_destroy() should solve this by turning off all CRTCs, but

(1) nv50_display_destroy() doesn't do the same and

(2) it's broken since commit d6bf2f3707 ("drm/nouveau: run mode_config
    destructor before destroying internal display state") because the
    crtc structs are torn down by drm_mode_config_cleanup() before being
    turned off. Also, there's no locking.

Move the code to turn off all CRTCs from nv04_display_destroy() to
nouveau_display_destroy() so that it's called for both nv04 and nv50
and before drm_mode_config_cleanup(). Use drm_crtc_force_disable_all()
helper to save on code and have proper locking.

Cc: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/66daa161322444bbde05d83cb0210b90a66988a4.1465392124.git.lukas@wunner.de
This commit is contained in:
Lukas Wunner 2016-06-08 18:47:27 +02:00 committed by Daniel Vetter
parent 6a0d952850
commit 523872f6b0
2 changed files with 1 additions and 10 deletions
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10
drivers/gpu/drm/nouveau/dispnv04/disp.c
View file

@ -125,18 +125,8 @@ nv04_display_destroy(struct drm_device *dev)
struct nv04_display *disp = nv04_display(dev);
struct nouveau_drm *drm = nouveau_drm(dev);
struct nouveau_encoder *encoder;
struct drm_crtc *crtc;
struct nouveau_crtc *nv_crtc;
/* Turn every CRTC off. */
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
struct drm_mode_set modeset = {
.crtc = crtc,
};
drm_mode_set_config_internal(&modeset);
}
/* Restore state */
list_for_each_entry(encoder, &dev->mode_config.encoder_list, base.base.head)
encoder->enc_restore(&encoder->base.base);

1
drivers/gpu/drm/nouveau/nouveau_display.c
View file

@ -554,6 +554,7 @@ nouveau_display_destroy(struct drm_device *dev)
nouveau_display_vblank_fini(dev);
drm_kms_helper_poll_fini(dev);
drm_crtc_force_disable_all(dev);
drm_mode_config_cleanup(dev);
if (disp->dtor)