linux-kernel - [PATCH] slimbus: qcom-ngd-ctrl: Avoid sending power requests without QMI

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Date:   Tue, 24 Nov 2020 21:42:55 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Vinod Koul <vkoul@...nel.org>, linux-arm-msm@...r.kernel.org,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [PATCH] slimbus: qcom-ngd-ctrl: Avoid sending power requests without QMI

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@...aro.org>
---
 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 d8decb345e9d..c502e9e93965 100644
--- a/drivers/slimbus/qcom-ngd-ctrl.c
+++ b/drivers/slimbus/qcom-ngd-ctrl.c
@@ -1229,6 +1229,9 @@ 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) {
@@ -1616,6 +1619,9 @@ 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);
-- 
2.29.2