From: Brandon Philips <brandon@ifup.org>
This fixes two bugs with UIO that cropped up recently in -rc1
1) WARNING: at fs/sysfs/file.c:334 sysfs_open_file when trying to open
a map addr/size file - complaining about missing sysfs_ops for ktype
2) Permission denied when reading uio/uio0/maps/map0/{addr,size} when
files are mode S_IRUGO
Also fix a typo: attr_attribute -> addr_attribute
Signed-off-by: Brandon Philips <bphilips@suse.de>
Signed-off-by: Hans J. Koch <hjk@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/uio/uio.c | 54 ++++++++++++++++++++++++++++++++++++----------------
1 files changed, 37 insertions(+), 17 deletions(-)
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 2a77e9d..e8a01f2 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -57,29 +57,29 @@ struct uio_map {
};
#define to_map(map) container_of(map, struct uio_map, kobj)
-
-static ssize_t map_attr_show(struct kobject *kobj, struct kobj_attribute *attr,
- char *buf)
+static ssize_t map_addr_show(struct uio_mem *mem, char *buf)
{
- struct uio_map *map = to_map(kobj);
- struct uio_mem *mem = map->mem;
-
- if (strncmp(attr->attr.name, "addr", 4) == 0)
- return sprintf(buf, "0x%lx\n", mem->addr);
-
- if (strncmp(attr->attr.name, "size", 4) == 0)
- return sprintf(buf, "0x%lx\n", mem->size);
+ return sprintf(buf, "0x%lx\n", mem->addr);
+}
- return -ENODEV;
+static ssize_t map_size_show(struct uio_mem *mem, char *buf)
+{
+ return sprintf(buf, "0x%lx\n", mem->size);
}
-static struct kobj_attribute attr_attribute =
- __ATTR(addr, S_IRUGO, map_attr_show, NULL);
-static struct kobj_attribute size_attribute =
- __ATTR(size, S_IRUGO, map_attr_show, NULL);
+struct uio_sysfs_entry {
+ struct attribute attr;
+ ssize_t (*show)(struct uio_mem *, char *);
+ ssize_t (*store)(struct uio_mem *, const char *, size_t);
+};
+
+static struct uio_sysfs_entry addr_attribute =
+ __ATTR(addr, S_IRUGO, map_addr_show, NULL);
+static struct uio_sysfs_entry size_attribute =
+ __ATTR(size, S_IRUGO, map_size_show, NULL);
static struct attribute *attrs[] = {
- &attr_attribute.attr,
+ &addr_attribute.attr,
&size_attribute.attr,
NULL, /* need to NULL terminate the list of attributes */
};
@@ -90,8 +90,28 @@ static void map_release(struct kobject *kobj)
kfree(map);
}
+static ssize_t map_type_show(struct kobject *kobj, struct attribute *attr,
+ char *buf)
+{
+ struct uio_map *map = to_map(kobj);
+ struct uio_mem *mem = map->mem;
+ struct uio_sysfs_entry *entry;
+
+ entry = container_of(attr, struct uio_sysfs_entry, attr);
+
+ if (!entry->show)
+ return -EIO;
+
+ return entry->show(mem, buf);
+}
+
+static struct sysfs_ops uio_sysfs_ops = {
+ .show = map_type_show,
+};
+
static struct kobj_type map_attr_type = {
.release = map_release,
+ .sysfs_ops = &uio_sysfs_ops,
.default_attrs = attrs,
};
--
1.5.4
--
