[PATCH 6.6 262/301] slimbus: qcom-ngd-ctrl: Add timeout for wait operation

Greg Kroah-Hartman
2024-05-14T11:27:21Z

From: Viken Dadhaniya <quic_vdadhani@quicinc.com>

commit 98241a774db49988f25b7b3657026ce51ccec293 upstream.

In current driver qcom_slim_ngd_up_worker() indefinitely
waiting for ctrl->qmi_up completion object. This is
resulting in workqueue lockup on Kthread.

Added wait_for_completion_interruptible_timeout to
allow the thread to wait for specific timeout period and
bail out instead waiting infinitely.

Fixes: a899d324863a ("slimbus: qcom-ngd-ctrl: add Sub System Restart support")
Cc: stable@vger.kernel.org
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Viken Dadhaniya <quic_vdadhani@quicinc.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20240430091238.35209-2-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/slimbus/qcom-ngd-ctrl.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/slimbus/qcom-ngd-ctrl.c
+++ b/drivers/slimbus/qcom-ngd-ctrl.c
@@ -1451,7 +1451,11 @@ static void qcom_slim_ngd_up_worker(stru
ctrl = container_of(work, struct qcom_slim_ngd_ctrl, ngd_up_work);

/* Make sure qmi service is up before continuing */
- wait_for_completion_interruptible(&ctrl->qmi_up);
+ if (!wait_for_completion_interruptible_timeout(&ctrl->qmi_up,
+ msecs_to_jiffies(MSEC_PER_SEC))) {
+ dev_err(ctrl->dev, "QMI wait timeout\n");
+ return;
+ }

mutex_lock(&ctrl->ssr_lock);
qcom_slim_ngd_enable(ctrl, true);