6.8-stable review patch. If anyone has any objections, please let me know.
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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.... 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);