linux-kernel - [PATCH 2/3] bus: mhi: core: Make sure to powerdown if mhi_sync_power

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Date:   Mon,  6 Apr 2020 15:04:36 -0600
From:   Jeffrey Hugo <jhugo@...eaurora.org>
To:     manivannan.sadhasivam@...aro.org, hemantk@...eaurora.org
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jeffrey Hugo <jhugo@...eaurora.org>
Subject: [PATCH 2/3] bus: mhi: core: Make sure to powerdown if mhi_sync_power_up fails

Powerdown is necessary if mhi_sync_power_up fails due to a timeout, to
clean up the resources.  Otherwise a BUG could be triggered when
attempting to clean up MSIs because the IRQ is still active from a
request_irq().

Signed-off-by: Jeffrey Hugo <jhugo@...eaurora.org>
---
 drivers/bus/mhi/core/pm.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
index cd6ba23..1bfa334 100644
--- a/drivers/bus/mhi/core/pm.c
+++ b/drivers/bus/mhi/core/pm.c
@@ -922,7 +922,11 @@ int mhi_sync_power_up(struct mhi_controller *mhi_cntrl)
 			   MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state),
 			   msecs_to_jiffies(mhi_cntrl->timeout_ms));
 
-	return (MHI_IN_MISSION_MODE(mhi_cntrl->ee)) ? 0 : -EIO;
+	ret = (MHI_IN_MISSION_MODE(mhi_cntrl->ee)) ? 0 : -EIO;
+
+	if (ret)
+		mhi_power_down(mhi_cntrl, false);
+	return ret;
 }
 EXPORT_SYMBOL(mhi_sync_power_up);
 
-- 
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