linux-kernel - [PATCH v3] Fix potential kernel panic by calling dev

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Message-ID: <20250904183405.32986-1-zxue@semtech.com>
Date: Thu,  4 Sep 2025 11:34:05 -0700
From: Adam Xue <zxue@...tech.com>
To: mani@...nel.org,
	jeff.hugo@....qualcomm.com,
	quic_yabdulra@...cinc.com,
	chentao@...inos.cn,
	quic_mattleun@...cinc.com,
	krishna.chundru@....qualcomm.com,
	mhi@...ts.linux.dev,
	linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: zxue@...tech.com,
	imocanu@...tech.com
Subject: [PATCH v3] Fix potential kernel panic by calling dev_err 

In mhi_init_irq_setup, the device pointer used for dev_err was not initialized.
 Use the pointer from mhi_cntrl instead.

Signed-off-by: Adam Xue <zxue@...tech.com>
---
 drivers/bus/mhi/host/init.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/bus/mhi/host/init.c b/drivers/bus/mhi/host/init.c
index 7f72aab38ce9..099be8dd1900 100644
--- a/drivers/bus/mhi/host/init.c
+++ b/drivers/bus/mhi/host/init.c
@@ -194,7 +194,6 @@ static void mhi_deinit_free_irq(struct mhi_controller *mhi_cntrl)
 static int mhi_init_irq_setup(struct mhi_controller *mhi_cntrl)
 {
 	struct mhi_event *mhi_event = mhi_cntrl->mhi_event;
-	struct device *dev = &mhi_cntrl->mhi_dev->dev;
 	unsigned long irq_flags = IRQF_SHARED | IRQF_NO_SUSPEND;
 	int i, ret;
 
@@ -221,7 +220,7 @@ static int mhi_init_irq_setup(struct mhi_controller *mhi_cntrl)
 			continue;
 
 		if (mhi_event->irq >= mhi_cntrl->nr_irqs) {
-			dev_err(dev, "irq %d not available for event ring\n",
+			dev_err(mhi_cntrl->cntrl_dev, "irq %d not available for event ring\n",
 				mhi_event->irq);
 			ret = -EINVAL;
 			goto error_request;
@@ -232,7 +231,7 @@ static int mhi_init_irq_setup(struct mhi_controller *mhi_cntrl)
 				  irq_flags,
 				  "mhi", mhi_event);
 		if (ret) {
-			dev_err(dev, "Error requesting irq:%d for ev:%d\n",
+			dev_err(mhi_cntrl->cntrl_dev, "Error requesting irq:%d for ev:%d\n",
 				mhi_cntrl->irq[mhi_event->irq], i);
 			goto error_request;
 		}
-- 
2.43.0


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