powerpc/opalcore: provide an option to invalidate /sys/firmware/opal/core file (845426f3) · Commits · 戴 / test

arch/powerpc/platforms/powernv/opal-core.c

+38 −0

Original line number	Diff line number	Diff line
		@@ -13,6 +13,8 @@
		#include <linux/proc_fs.h>
		#include <linux/elf.h>
		#include <linux/elfcore.h>
		#include <linux/kobject.h>
		#include <linux/sysfs.h>
		#include <linux/slab.h>
		#include <linux/crash_core.h>
		#include <linux/of.h>
		@@ -561,6 +563,36 @@ error_out:
		of_node_put(np);
		}

		static ssize_t fadump_release_opalcore_store(struct kobject *kobj,
		struct kobj_attribute *attr,
		const char *buf, size_t count)
		{
		int input = -1;

		if (kstrtoint(buf, 0, &input))
		return -EINVAL;

		if (input == 1) {
		if (oc_conf == NULL) {
		pr_err("'/sys/firmware/opal/core' file not accessible!\n");
		return -EPERM;
		}

		/*
		* Take away '/sys/firmware/opal/core' and release all memory
		* used for exporting this file.
		*/
		opalcore_cleanup();
		} else
		return -EINVAL;

		return count;
		}

		static struct kobj_attribute opalcore_rel_attr = __ATTR(fadump_release_opalcore,
		0200, NULL,
		fadump_release_opalcore_store);

		static int __init opalcore_init(void)
		{
		int rc = -1;
		@@ -593,6 +625,12 @@ static int __init opalcore_init(void)
		return rc;
		}

		rc = sysfs_create_file(kernel_kobj, &opalcore_rel_attr.attr);
		if (rc) {
		pr_warn("unable to create sysfs file fadump_release_opalcore (%d)\n",
		rc);
		}

		return 0;
		}
		fs_initcall(opalcore_init);