The current dev_unload order uninits the irqs too early.
In the current sequence, it's possible that a crtc queues work(apply_worker)
to display a buffer, which registers to omap_crtc_apply_irq to notfiy the
completion of the configuration we applied.
Calling drm_vblank_cleanup and omap_drm_irq_uninstall here causes the crtc's
apply handler to never get called, which results in an incorrect state of the
apply_irq.registered parameter.
This condition occurs where there is no mode set via omapdrm, and dev_lastclose
tries to set a default fb mode via drm_fb_helper_restore_fbdev_mode. The apply
work scheduled by restore_fbdev_mode is very close in time to the disabling of
the irq handler, and hence leads to a race condition. We move the irq cleanup
at the end of the unload sequence to prevent this.
Also, the call to flush_workqueue is removed since it's called internally by
destroy_workqueue.
Signed-off-by: Archit Taneja <archit@xxxxxx>
---
drivers/gpu/drm/omapdrm/omap_drv.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
index fca5667..c57e99c 100644
--- a/drivers/gpu/drm/omapdrm/omap_drv.c
+++ b/drivers/gpu/drm/omapdrm/omap_drv.c
@@ -517,16 +517,16 @@ static int dev_unload(struct drm_device *dev)
DBG("unload: dev=%p", dev);
drm_kms_helper_poll_fini(dev);
- drm_vblank_cleanup(dev);
- omap_drm_irq_uninstall(dev);
omap_fbdev_free(dev);
omap_modeset_free(dev);
omap_gem_deinit(dev);
- flush_workqueue(priv->wq);
destroy_workqueue(priv->wq);
+ drm_vblank_cleanup(dev);
+ omap_drm_irq_uninstall(dev);
+
kfree(dev->dev_private);
dev->dev_private = NULL;
--
1.8.3.2
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