[PATCH v4] bus: mhi: host: Fix potential kernel panic by calling dev_err

[PATCH v4] bus: mhi: host: Fix potential kernel panic by calling dev_err

[Adam Xue]

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@semtech.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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Re: [PATCH v4] bus: mhi: host: Fix potential kernel panic by calling dev_err

[Manivannan Sadhasivam]

On Fri, 05 Sep 2025 10:41:18 -0700, Adam Xue wrote:
> In mhi_init_irq_setup, the device pointer used for dev_err
> was not initialized. Use the pointer from mhi_cntrl instead.
> 
> 

Applied, thanks!

[1/1] bus: mhi: host: Fix potential kernel panic by calling dev_err
      commit: d0856a6dff57f95cc5d2d74e50880f01697d0cc4

I've saved time by adding the tags myself.

Best regards,
-- 
Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>