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drm: bridge: dw-hdmi: fixup kernel crash when reboot with hdmi connected

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when other devices bind failed,drm will unbind and re-bind all devices.
if don't cancel the delayed work but flush and destroy workqueue directly,
kernel point is likely to become NULL.

Change-Id: Ib48704186ee298cbd4daac1cdbbac5fb3906b6bb
Signed-off-by: algea.cao <algea.cao@rock-chips.com>
This commit is contained in:
algea.cao
2017-05-02 09:03:19 +08:00
committed by Huang, Tao
parent 9b050a98b7
commit d3a6dbe682
1 changed files with 7 additions and 3 deletions
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10
drivers/gpu/drm/bridge/dw-hdmi.c
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@@ -2828,6 +2828,13 @@ void dw_hdmi_unbind(struct device *dev, struct device *master, void *data)
{
struct dw_hdmi *hdmi = dev_get_drvdata(dev);
if (hdmi->irq)
disable_irq(hdmi->irq);
cancel_delayed_work(&hdmi->work);
flush_workqueue(hdmi->workqueue);
destroy_workqueue(hdmi->workqueue);
if (hdmi->audio && !IS_ERR(hdmi->audio))
platform_device_unregister(hdmi->audio);
@@ -2847,9 +2854,6 @@ void dw_hdmi_unbind(struct device *dev, struct device *master, void *data)
i2c_del_adapter(&hdmi->i2c->adap);
else
i2c_put_adapter(hdmi->ddc);
flush_workqueue(hdmi->workqueue);
destroy_workqueue(hdmi->workqueue);
}
EXPORT_SYMBOL_GPL(dw_hdmi_unbind);