From: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
[ Upstream commit 39014ce6d6028614a46395923a2c92d058b6fa87 ]
Attempting to send a power request during PM operations, when the QMI
handle isn't initialized results in a NULL pointer dereference. So check
if the QMI handle has been initialized before attempting to post the
power requests.
Fixes: 917809e2280b ("slimbus: ngd: Add qcom SLIMBus NGD driver")
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20201127102451.17114-7-srinivas.kandagatla@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/slimbus/qcom-ngd-ctrl.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
index ce265bf7de868..b60541c3f72da 100644
--- a/drivers/slimbus/qcom-ngd-ctrl.c
+++ b/drivers/slimbus/qcom-ngd-ctrl.c
@@ -1201,6 +1201,9 @@ static int qcom_slim_ngd_runtime_resume(struct device *dev)
struct qcom_slim_ngd_ctrl *ctrl = dev_get_drvdata(dev);
int ret = 0;
+ if (!ctrl->qmi.handle)
+ return 0;
+
if (ctrl->state >= QCOM_SLIM_NGD_CTRL_ASLEEP)
ret = qcom_slim_ngd_power_up(ctrl);
if (ret) {
@@ -1497,6 +1500,9 @@ static int __maybe_unused qcom_slim_ngd_runtime_suspend(struct device *dev)
struct qcom_slim_ngd_ctrl *ctrl = dev_get_drvdata(dev);
int ret = 0;
+ if (!ctrl->qmi.handle)
+ return 0;
+
ret = qcom_slim_qmi_power_request(ctrl, false);
if (ret && ret != -EBUSY)
dev_info(ctrl->dev, "slim resource not idle:%d\n", ret);
--
2.27.0
