linux-kernel - [PATCH] mailbox: tegra-hsp: Set lockdep class dynamically

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Message-Id: <20210210134945.2699170-1-mperttunen@nvidia.com>
Date:   Wed, 10 Feb 2021 15:49:45 +0200
From:   Mikko Perttunen <mperttunen@...dia.com>
To:     jassisinghbrar@...il.com, thierry.reding@...il.com,
        jonathanh@...dia.com
Cc:     linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        Mikko Perttunen <mperttunen@...dia.com>
Subject: [PATCH] mailbox: tegra-hsp: Set lockdep class dynamically

On Tegra194, due to both BPMP and TCU using mailboxes, we get a
lockdep spew at boot. Both are using different instances of HSP,
so this is harmless. As such give each HSP instance a different
lockdep class.

Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
---
 drivers/mailbox/tegra-hsp.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/mailbox/tegra-hsp.c b/drivers/mailbox/tegra-hsp.c
index e07091d71986..acd0675da681 100644
--- a/drivers/mailbox/tegra-hsp.c
+++ b/drivers/mailbox/tegra-hsp.c
@@ -98,7 +98,9 @@ struct tegra_hsp {
 	unsigned int num_ss;
 	unsigned int num_db;
 	unsigned int num_si;
+
 	spinlock_t lock;
+	struct lock_class_key lock_key;
 
 	struct list_head doorbells;
 	struct tegra_hsp_mailbox *mailboxes;
@@ -775,6 +777,18 @@ static int tegra_hsp_probe(struct platform_device *pdev)
 			return err;
 	}
 
+	lockdep_register_key(&hsp->lock_key);
+	lockdep_set_class(&hsp->lock, &hsp->lock_key);
+
+	return 0;
+}
+
+static int tegra_hsp_remove(struct platform_device *pdev)
+{
+	struct tegra_hsp *hsp = platform_get_drvdata(pdev);
+
+	lockdep_unregister_key(&hsp->lock_key);
+
 	return 0;
 }
 
@@ -834,6 +848,7 @@ static struct platform_driver tegra_hsp_driver = {
 		.pm = &tegra_hsp_pm_ops,
 	},
 	.probe = tegra_hsp_probe,
+	.remove = tegra_hsp_remove,
 };
 
 static int __init tegra_hsp_init(void)
-- 
2.30.0