linux-kernel - [PATCH] soc: qcom: rpmh-rsc: Set suppress_bind

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Date:   Mon, 22 Jun 2020 12:23:25 +0530
From:   Maulik Shah <mkshah@...eaurora.org>
To:     bjorn.andersson@...aro.org, agross@...nel.org
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        dianders@...omium.org, swboyd@...omium.org, rnayak@...eaurora.org,
        ilina@...eaurora.org, lsrao@...eaurora.org,
        Maulik Shah <mkshah@...eaurora.org>
Subject: [PATCH] soc: qcom: rpmh-rsc: Set suppress_bind_attrs flag

rpmh-rsc driver is fairly core to system and should not be removable
once its probed. However it allows to unbind driver from sysfs using
below command which results into a crash on sc7180.

echo 18200000.rsc > /sys/bus/platform/drivers/rpmh/unbind

Lets prevent unbind at runtime by setting suppress_bind_attrs flag.

Signed-off-by: Maulik Shah <mkshah@...eaurora.org>
---
 drivers/soc/qcom/rpmh-rsc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
index 076fd27..752a561 100644
--- a/drivers/soc/qcom/rpmh-rsc.c
+++ b/drivers/soc/qcom/rpmh-rsc.c
@@ -1023,6 +1023,7 @@ static struct platform_driver rpmh_driver = {
 	.driver = {
 		  .name = "rpmh",
 		  .of_match_table = rpmh_drv_match,
+		  .suppress_bind_attrs = true,
 	},
 };
 
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