From: Russell Currey
The code that handles the format string in secvar-sysfs.c is entirely
OPAL specific, so create a new "format" op in secvar_operations to make
the secvar code more generic. No functional change.
Signed-off-by: Russell Currey
Signed-off-by: Andrew Donnellan
---
v2: Use sysfs_emit() instead of sprintf() (gregkh)
v3: Enforce format string size limit (ruscur)
v4: Pass the buffer size as an argument, not using a macro (stefanb,
npiggin)
Fix error reporting (npiggin)
---
arch/powerpc/include/asm/secvar.h| 1 +
arch/powerpc/kernel/secvar-sysfs.c | 27 +++-
arch/powerpc/platforms/powernv/opal-secvar.c | 25 ++
3 files changed, 35 insertions(+), 18 deletions(-)
diff --git a/arch/powerpc/include/asm/secvar.h
b/arch/powerpc/include/asm/secvar.h
index a2b5f2203dc5..1a2c696a48ad 100644
--- a/arch/powerpc/include/asm/secvar.h
+++ b/arch/powerpc/include/asm/secvar.h
@@ -17,6 +17,7 @@ struct secvar_operations {
int (*get)(const char *key, u64 key_len, u8 *data, u64 *data_size);
int (*get_next)(const char *key, u64 *key_len, u64 keybufsize);
int (*set)(const char *key, u64 key_len, u8 *data, u64 data_size);
+ ssize_t (*format)(char *buf, size_t bufsize);
};
#ifdef CONFIG_PPC_SECURE_BOOT
diff --git a/arch/powerpc/kernel/secvar-sysfs.c
b/arch/powerpc/kernel/secvar-sysfs.c
index b786d1005027..e4661559c855 100644
--- a/arch/powerpc/kernel/secvar-sysfs.c
+++ b/arch/powerpc/kernel/secvar-sysfs.c
@@ -21,26 +21,17 @@ static struct kset *secvar_kset;
static ssize_t format_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
- ssize_t rc = 0;
- struct device_node *node;
- const char *format;
-
- node = of_find_compatible_node(NULL, NULL, "ibm,secvar-backend");
- if (!of_device_is_available(node)) {
- rc = -ENODEV;
- goto out;
- }
+ char tmp[32];
+ ssize_t len = secvar_ops->format(tmp, sizeof(tmp));
- rc = of_property_read_string(node, "format", &format);
- if (rc)
- goto out;
+ if (len > 0)
+ return sysfs_emit(buf, "%s\n", tmp);
+ else if (len < 0)
+ pr_err("Error %zd reading format string\n", len);
+ else
+ pr_err("Got empty format string from backend\n");
- rc = sysfs_emit(buf, "%s\n", format);
-
-out:
- of_node_put(node);
-
- return rc;
+ return -EIO;
}
diff --git a/arch/powerpc/platforms/powernv/opal-secvar.c
b/arch/powerpc/platforms/powernv/opal-secvar.c
index 4c0a3b030fe0..e33bb703ecbc 100644
--- a/arch/powerpc/platforms/powernv/opal-secvar.c
+++ b/arch/powerpc/platforms/powernv/opal-secvar.c
@@ -98,10 +98,35 @@ static int opal_set_variable(const char *key, u64 ksize, u8
*data, u64 dsize)
return opal_status_to_err(rc);
}
+static ssize_t opal_secvar_format(char *buf, size_t bufsize)
+{
+ ssize_t rc = 0;
+ struct device_node *node;
+ const char *format;
+
+ node = of_find_compatible_node(NULL, NULL, "ibm,secvar-backend");
+ if (!of_device_is_available(node)) {
+ rc = -ENODEV;
+ goto out;
+ }
+
+ rc = of_property_read_string(node, "format", &format);
+ if (rc)
+ goto out;
+
+ rc = snprintf(buf, bufsize, "%s", format);
+
+out:
+ of_node_put(node);
+
+ return rc;
+}
+
static const struct secvar_operations opal_secvar_ops = {
.get = opal_get_variable,
.get_next = opal_get_next_variable,
.set = opal_set_variable,
+ .format = opal_secvar_format,
};
static int opal_secvar_probe(struct platform_device *pdev)
--
2.39.1
