drm: bridge: anx7625: Fix NULL pointer dereference with early IRQ

[ Upstream commit a10f910 ]

If the interrupt occurs before resource initialization is complete, the
interrupt handler/worker may access uninitialized data such as the I2C
tcpc_client device, potentially leading to NULL pointer dereference.

Signed-off-by: Loic Poulain <[email protected]>
Fixes: 8bdfc5d ("drm/bridge: anx7625: Add anx7625 MIPI DSI/DPI to DP")
Reviewed-by: Dmitry Baryshkov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Baryshkov <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

Author: Loic Poulain

drivers/gpu/drm/bridge/analogix/anx7625.c

@@ -2678,7 +2678,7 @@ static int anx7625_i2c_probe(struct i2c_client *client)
 		ret = devm_request_threaded_irq(dev, platform->pdata.intp_irq,
 						NULL, anx7625_intr_hpd_isr,
 						IRQF_TRIGGER_FALLING |
-						IRQF_ONESHOT,
+						IRQF_ONESHOT | IRQF_NO_AUTOEN,
 						"anx7625-intp", platform);
 		if (ret) {
 			DRM_DEV_ERROR(dev, "fail to request irq\n");
@@ -2747,8 +2747,10 @@ static int anx7625_i2c_probe(struct i2c_client *client)
 	}
 
 	/* Add work function */
-	if (platform->pdata.intp_irq)
+	if (platform->pdata.intp_irq) {
+		enable_irq(platform->pdata.intp_irq);
 		queue_work(platform->workqueue, &platform->work);
+	}
 
 	if (platform->pdata.audio_en)
 		anx7625_register_audio(dev, platform);