powerpc/powernv/ultravisor: Constify 'struct bin_attribute'

The sysfs core now allows instances of 'struct bin_attribute' to be
moved into read-only memory. Make use of that to protect them against
accidental or malicious modifications.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20241216-sysfs-const-bin_attr-powerpc-v1-3-bbed8906f476@weissschuh.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/powerpc/platforms/powernv/ultravisor.c b/arch/powerpc/platforms/powernv/ultravisor.c
index 67c8c4b2d8b17c3662507121e97f48587d3ef82b..157d9a8134e445ed22be8ae58ff9181b45ac7ff0 100644 (file)
--- a/arch/powerpc/platforms/powernv/ultravisor.c
+++ b/arch/powerpc/platforms/powernv/ultravisor.c
@@ -32,15 +32,15 @@ int __init early_init_dt_scan_ultravisor(unsigned long node, const char *uname,
 static struct memcons *uv_memcons;
 
 static ssize_t uv_msglog_read(struct file *file, struct kobject *kobj,
-                             struct bin_attribute *bin_attr, char *to,
+                             const struct bin_attribute *bin_attr, char *to,
                              loff_t pos, size_t count)
 {
        return memcons_copy(uv_memcons, to, pos, count);
 }
 
-static struct bin_attribute uv_msglog_attr = {
+static struct bin_attribute uv_msglog_attr __ro_after_init = {
        .attr = {.name = "msglog", .mode = 0400},
-       .read = uv_msglog_read
+       .read_new = uv_msglog_read
 };
 
 static int __init uv_init(void)