linux-kernel - [PATCH 4.19 16/25] soc: sunxi: sram: Prevent the driver from being unbound

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Date:   Mon,  3 Oct 2022 09:12:19 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 16/25] soc: sunxi: sram: Prevent the driver from being unbound

From: Samuel Holland <samuel@...lland.org>

[ Upstream commit 90e10a1fcd9b24b4ba8c0d35136127473dcd829e ]

This driver exports a regmap tied to the platform device (as opposed to
a syscon, which exports a regmap tied to the OF node). Because of this,
the driver can never be unbound, as that would destroy the regmap. Use
builtin_platform_driver_probe() to enforce this limitation.

Fixes: 5828729bebbb ("soc: sunxi: export a regmap for EMAC clock reg on A64")
Reviewed-by: Jernej Skrabec <jernej.skrabec@...il.com>
Signed-off-by: Samuel Holland <samuel@...lland.org>
Reviewed-by: Heiko Stuebner <heiko@...ech.de>
Tested-by: Heiko Stuebner <heiko@...ech.de>
Signed-off-by: Jernej Skrabec <jernej.skrabec@...il.com>
Link: https://lore.kernel.org/r/20220815041248.53268-5-samuel@sholland.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/soc/sunxi/sunxi_sram.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/soc/sunxi/sunxi_sram.c b/drivers/soc/sunxi/sunxi_sram.c
index 51148704af49..17ac818622fe 100644
--- a/drivers/soc/sunxi/sunxi_sram.c
+++ b/drivers/soc/sunxi/sunxi_sram.c
@@ -325,7 +325,7 @@ static struct regmap_config sunxi_sram_emac_clock_regmap = {
 	.writeable_reg	= sunxi_sram_regmap_accessible_reg,
 };
 
-static int sunxi_sram_probe(struct platform_device *pdev)
+static int __init sunxi_sram_probe(struct platform_device *pdev)
 {
 	struct resource *res;
 	struct dentry *d;
@@ -399,9 +399,8 @@ static struct platform_driver sunxi_sram_driver = {
 		.name		= "sunxi-sram",
 		.of_match_table	= sunxi_sram_dt_match,
 	},
-	.probe	= sunxi_sram_probe,
 };
-module_platform_driver(sunxi_sram_driver);
+builtin_platform_driver_probe(sunxi_sram_driver, sunxi_sram_probe);
 
 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@...e-electrons.com>");
 MODULE_DESCRIPTION("Allwinner sunXi SRAM Controller Driver");
-- 
2.35.1