linux-kernel - [PATCH] soc: qcom: rmtfs-mem: Validate that scm is available

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Date:   Mon, 27 Aug 2018 22:05:48 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: [PATCH] soc: qcom: rmtfs-mem: Validate that scm is available

The scm device must be present in order for the rmtfs driver to
configure memory permissions for the rmtfs memory region, so check that
it is probed before continuing.

Cc: stable@...r.kernel.org
Fixes: fa65f8045137 ("soc: qcom: rmtfs-mem: Add support for assigning memory to remote")
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---
 drivers/soc/qcom/rmtfs_mem.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/soc/qcom/rmtfs_mem.c b/drivers/soc/qcom/rmtfs_mem.c
index 8a3678c2e83c..97bb5989aa21 100644
--- a/drivers/soc/qcom/rmtfs_mem.c
+++ b/drivers/soc/qcom/rmtfs_mem.c
@@ -212,6 +212,11 @@ static int qcom_rmtfs_mem_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "failed to parse qcom,vmid\n");
 		goto remove_cdev;
 	} else if (!ret) {
+		if (!qcom_scm_is_available()) {
+			ret = -EPROBE_DEFER;
+			goto remove_cdev;
+		}
+
 		perms[0].vmid = QCOM_SCM_VMID_HLOS;
 		perms[0].perm = QCOM_SCM_PERM_RW;
 		perms[1].vmid = vmid;
-- 
2.18.0