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@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: James Morse <james.morse@arm.com>
Cc: Kristina Martsenko <kristina.martsenko@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Vladimir Murzin <vladimir.murzin@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20230313182918.1312597-11-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 2e3e551..f3bab4b 100644 (file)
--- 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);