linux-kernel - [PATCH] soc: renesas: rz-sysc: Suppress binding attributes

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Message-ID: <20250215131843.228905-1-claudiu.beznea.uj@bp.renesas.com>
Date: Sat, 15 Feb 2025 15:18:43 +0200
From: Claudiu <claudiu.beznea@...on.dev>
To: geert+renesas@...der.be,
	magnus.damm@...il.com,
	john.madieu.xa@...renesas.com
Cc: claudiu.beznea@...on.dev,
	linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: [PATCH] soc: renesas: rz-sysc: Suppress binding attributes

From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

The matching data for the rz-sysc driver is marked with __initconst, which
means it is discarded after initialization. Because of this, attempting to
unbind/bind the driver through sysfs after system boot can lead to "Unable
to handle kernel paging request at virtual address" errors due to accessing
freed memory.

Since the System Controller (SYSC) is an essential block for Renesas SoCs,
suppress binding attributes to prevent them being exposed in sysfs,
avoiding potential issues.

Fixes: 1660e5ea6a3e ("soc: renesas: Add SYSC driver for Renesas RZ family")
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---
 drivers/soc/renesas/rz-sysc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/soc/renesas/rz-sysc.c b/drivers/soc/renesas/rz-sysc.c
index 1c98da37b7d1..14db508f669f 100644
--- a/drivers/soc/renesas/rz-sysc.c
+++ b/drivers/soc/renesas/rz-sysc.c
@@ -120,6 +120,7 @@ static int rz_sysc_probe(struct platform_device *pdev)
 static struct platform_driver rz_sysc_driver = {
 	.driver = {
 		.name = "renesas-rz-sysc",
+		.suppress_bind_attrs = true,
 		.of_match_table = rz_sysc_match
 	},
 	.probe = rz_sysc_probe
-- 
2.43.0