From 4f808bcdf8dcf1f1ecd028f6d5c5347db4cddc54 Mon Sep 17 00:00:00 2001 From: Brandon Philips Date: Tue, 19 Feb 2008 01:55:05 -0800 Subject: [PATCH] UIO: fix Greg's stupid changes 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 Signed-off-by: Hans J. Koch Signed-off-by: Greg Kroah-Hartman --- drivers/uio/uio.c | 54 ++++++++++++++++++++++++++++++++--------------- 1 file changed, 37 insertions(+), 17 deletions(-) diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c index 2a77e9d42c68..e8a01f264540 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, }; -- 2.20.1