[PATCH 5.4.y] media: venus: protect against spurious interrupts during probe

[Sasha Levin <sashal@kernel.org>]

From: Jorge Ramirez-Ortiz <jorge.ramirez@oss.qualcomm.com>

[ Upstream commit 3200144a2fa4209dc084a19941b9b203b43580f0 ]

Make sure the interrupt handler is initialized before the interrupt is
registered.

If the IRQ is registered before hfi_create(), it's possible that an
interrupt fires before the handler setup is complete, leading to a NULL
dereference.

This error condition has been observed during system boot on Rb3Gen2.

Fixes: af2c3834c8ca ("[media] media: venus: adding core part and helper functions")
Cc: stable@vger.kernel.org
Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez@oss.qualcomm.com>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Vikash Garodia <quic_vgarodia@quicinc.com>
Reviewed-by: Dikshita Agarwal <quic_dikshita@quicinc.com>
Tested-by: Dikshita Agarwal <quic_dikshita@quicinc.com> # RB5
Signed-off-by: Bryan O'Donoghue <bod@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
[ kept hfi_isr_thread instead of venus_isr_thread ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/media/platform/qcom/venus/core.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
index f003c57a1645..42088120128f 100644
--- a/drivers/media/platform/qcom/venus/core.c
+++ b/drivers/media/platform/qcom/venus/core.c
@@ -267,13 +267,13 @@ static int venus_probe(struct platform_device *pdev)
 	mutex_init(&core->lock);
 	INIT_DELAYED_WORK(&core->work, venus_sys_error_handler);
 
-	ret = devm_request_threaded_irq(dev, core->irq, hfi_isr, hfi_isr_thread,
-					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
-					"venus", core);
+	ret = hfi_create(core, &venus_core_ops);
 	if (ret)
 		return ret;
 
-	ret = hfi_create(core, &venus_core_ops);
+	ret = devm_request_threaded_irq(dev, core->irq, hfi_isr, hfi_isr_thread,
+					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
+					"venus", core);
 	if (ret)
 		return ret;
 
-- 
2.50.1