linux-kernel - [PATCH 3/4] reset: tegra: check BPMP response return code

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Message-ID: <00e7714871d7568e9fc848dc5f76d14e07984a1e.1504776489.git.talho@nvidia.com>
Date:   Thu, 7 Sep 2017 12:31:03 +0300
From:   Timo Alho <talho@...dia.com>
To:     <thierry.reding@...il.com>
CC:     <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Timo Alho <talho@...dia.com>
Subject: [PATCH 3/4] reset: tegra: check BPMP response return code

Add checks for return code in BPMP response message.

Signed-off-by: Timo Alho <talho@...dia.com>
---
 drivers/reset/tegra/reset-bpmp.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/reset/tegra/reset-bpmp.c b/drivers/reset/tegra/reset-bpmp.c
index 5daf2ee..fac2db6 100644
--- a/drivers/reset/tegra/reset-bpmp.c
+++ b/drivers/reset/tegra/reset-bpmp.c
@@ -23,6 +23,7 @@ static int tegra_bpmp_reset_common(struct reset_controller_dev *rstc,
 	struct tegra_bpmp *bpmp = to_tegra_bpmp(rstc);
 	struct mrq_reset_request request;
 	struct tegra_bpmp_message msg;
+	int err;
 
 	memset(&request, 0, sizeof(request));
 	request.cmd = command;
@@ -33,7 +34,13 @@ static int tegra_bpmp_reset_common(struct reset_controller_dev *rstc,
 	msg.tx.data = &request;
 	msg.tx.size = sizeof(request);
 
-	return tegra_bpmp_transfer(bpmp, &msg);
+	err = tegra_bpmp_transfer(bpmp, &msg);
+	if (err < 0)
+		return err;
+	else if (msg.rx.ret < 0)
+		return -EINVAL;
+
+	return 0;
 }
 
 static int tegra_bpmp_reset_module(struct reset_controller_dev *rstc,
-- 
2.7.4