linux-kernel - [PATCH AUTOSEL 4.19 02/31] soc: qcom: rpmh-rsc: Set suppress_bind

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Date:   Mon, 10 Aug 2020 15:12:30 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Maulik Shah <mkshah@...eaurora.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Sasha Levin <sashal@...nel.org>, linux-arm-msm@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 02/31] soc: qcom: rpmh-rsc: Set suppress_bind_attrs flag

From: Maulik Shah <mkshah@...eaurora.org>

[ Upstream commit 1a53ce9ab4faeb841b33d62d23283dc76c0e7c5a ]

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.

Reviewed-by: Stephen Boyd <swboyd@...omium.org>
Signed-off-by: Maulik Shah <mkshah@...eaurora.org>
Link: https://lore.kernel.org/r/1592808805-2437-1-git-send-email-mkshah@codeaurora.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.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 3c6f920535eae..519d19f57eee2 100644
--- a/drivers/soc/qcom/rpmh-rsc.c
+++ b/drivers/soc/qcom/rpmh-rsc.c
@@ -715,6 +715,7 @@ static struct platform_driver rpmh_driver = {
 	.driver = {
 		  .name = "rpmh",
 		  .of_match_table = rpmh_drv_match,
+		  .suppress_bind_attrs = true,
 	},
 };
 
-- 
2.25.1