linux-kernel - [PATCH] remoteproc: sysmon: fix shutdown

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Date:   Fri,  4 Dec 2020 20:37:35 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Rishabh Bhatnagar <rishabhb@...eaurora.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Siddharth Gupta <sidgup@...eaurora.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Ma Feng <mafeng.ma@...wei.com>,
        Rikard Falkeborn <rikard.falkeborn@...il.com>,
        linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] remoteproc: sysmon: fix shutdown_acked state

From: Arnd Bergmann <arnd@...db.de>

The latest version of sysmon_stop() starts by initializing
the sysmon->shutdown_acked variable, but then overwrites it
with an uninitialized variable later:

drivers/remoteproc/qcom_sysmon.c:551:11: error: variable 'acked' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
        else if (sysmon->ept)
                 ^~~~~~~~~~~
drivers/remoteproc/qcom_sysmon.c:554:27: note: uninitialized use occurs here
        sysmon->shutdown_acked = acked;
                                 ^~~~~

Remove the local 'acked' variable again and set the state directly.

Fixes: 5c212aaf5457 ("remoteproc: sysmon: Expose the shutdown result")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/remoteproc/qcom_sysmon.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/remoteproc/qcom_sysmon.c b/drivers/remoteproc/qcom_sysmon.c
index d01bc4bda7bf..9fca81492863 100644
--- a/drivers/remoteproc/qcom_sysmon.c
+++ b/drivers/remoteproc/qcom_sysmon.c
@@ -533,7 +533,6 @@ static void sysmon_stop(struct rproc_subdev *subdev, bool crashed)
 		.subsys_name = sysmon->name,
 		.ssr_event = SSCTL_SSR_EVENT_BEFORE_SHUTDOWN
 	};
-	bool acked;
 
 	sysmon->shutdown_acked = false;
 
@@ -547,11 +546,9 @@ static void sysmon_stop(struct rproc_subdev *subdev, bool crashed)
 		return;
 
 	if (sysmon->ssctl_version)
-		acked = ssctl_request_shutdown(sysmon);
+		sysmon->shutdown_acked = ssctl_request_shutdown(sysmon);
 	else if (sysmon->ept)
-		acked = sysmon_request_shutdown(sysmon);
-
-	sysmon->shutdown_acked = acked;
+		sysmon->shutdown_acked = sysmon_request_shutdown(sysmon);
 }
 
 static void sysmon_unprepare(struct rproc_subdev *subdev)
-- 
2.27.0