linux-kernel - [PATCH 11/36] arm64: cpufeature: move to use bus_get_dev

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Date:   Mon, 13 Mar 2023 19:28:53 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     rafael@...nel.org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Mark Brown <broonie@...nel.org>,
        James Morse <james.morse@....com>,
        Kristina Martsenko <kristina.martsenko@....com>,
        Marc Zyngier <maz@...nel.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Vladimir Murzin <vladimir.murzin@....com>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 11/36] arm64: cpufeature: move to use bus_get_dev_root()

Direct access to the struct bus_type dev_root pointer is going away soon
so replace that with a call to bus_get_dev_root() instead, which is what
it is there for.

Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will@...nel.org>
Cc: Mark Brown <broonie@...nel.org>
Cc: James Morse <james.morse@....com>
Cc: Kristina Martsenko <kristina.martsenko@....com>
Cc: Marc Zyngier <maz@...nel.org>
Cc: Ard Biesheuvel <ardb@...nel.org>
Cc: Vladimir Murzin <vladimir.murzin@....com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: linux-arm-kernel@...ts.infradead.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
Note, this is a patch that is a prepatory cleanup as part of a larger
series of patches that is working on resolving some old driver core
design mistakes.  It will build and apply cleanly on top of 6.3-rc2 on
its own, but I'd prefer if I could take it through my driver-core tree
so that the driver core changes can be taken through there for 6.4-rc1.

 arch/arm64/kernel/cpufeature.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 2e3e55139777..f3bab4bd0917 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -1490,10 +1490,18 @@ static const DEVICE_ATTR_RO(aarch32_el0);
 
 static int __init aarch32_el0_sysfs_init(void)
 {
+	struct device *dev_root;
+	int ret = 0;
+
 	if (!allow_mismatched_32bit_el0)
 		return 0;
 
-	return device_create_file(cpu_subsys.dev_root, &dev_attr_aarch32_el0);
+	dev_root = bus_get_dev_root(&cpu_subsys);
+	if (dev_root) {
+		ret = device_create_file(dev_root, &dev_attr_aarch32_el0);
+		put_device(dev_root);
+	}
+	return ret;
 }
 device_initcall(aarch32_el0_sysfs_init);
 
-- 
2.39.2