[PATCH v7 02/18] drm/bridge: synopsys: dw-dp: Cancel pending HPD work on unbind

[Sebastian Reichel]

There is a race condition during device unbind: If the HPD interrupt
started an HPD worker exactly when the unbind happens, the worker
thread might access invalid resources. Avoid this by stopping any
pending work immediately after disabling the interrupt.

Fixes: 86eecc3a9c2e ("drm/bridge: synopsys: Add DW DPTX Controller support library")
Reported-by: Sashiko <sashiko-bot at kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel at collabora.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-dp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-dp.c b/drivers/gpu/drm/bridge/synopsys/dw-dp.c
index 67d9cd0bf5fd..8393f9c9b0f0 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-dp.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-dp.c
@@ -1996,6 +1996,7 @@ EXPORT_SYMBOL_GPL(dw_dp_bind);
 void dw_dp_unbind(struct dw_dp *dp)
 {
 	disable_irq(dp->irq);
+	cancel_work_sync(&dp->hpd_work);
 	phy_exit(dp->phy);
 	drm_dp_aux_unregister(&dp->aux);
 }

-- 
2.53.0