[PATCH v16 02/11] fw_cfg: fix sparse warnings with fw_cfg_file

Marc-André Lureau
2018-02-28T15:06:30Z

Modify fw_cfg_sysfs_entry to store entry values, instead of reusing
the restricted types.

Fixes warnings such as:

$ make C=1 CF=-D__CHECK_ENDIAN__ drivers/firmware/qemu_fw_cfg.o

drivers/firmware/qemu_fw_cfg.c:491:29: warning: incorrect type in assignment (different base types)
drivers/firmware/qemu_fw_cfg.c:491:29: expected restricted __be32 [usertype] size
drivers/firmware/qemu_fw_cfg.c:491:29: got unsigned int
drivers/firmware/qemu_fw_cfg.c:492:31: warning: incorrect type in assignment (different base types)
drivers/firmware/qemu_fw_cfg.c:492:31: expected restricted __be16 [usertype] select
drivers/firmware/qemu_fw_cfg.c:492:31: got int

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
drivers/firmware/qemu_fw_cfg.c | 28 +++++++++++++++-------------
1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/drivers/firmware/qemu_fw_cfg.c b/drivers/firmware/qemu_fw_cfg.c
index e7ea2b3b1d11..7978844f6b37 100644
--- a/drivers/firmware/qemu_fw_cfg.c
+++ b/drivers/firmware/qemu_fw_cfg.c
@@ -211,7 +211,9 @@ static const struct {
/* fw_cfg_sysfs_entry type */
struct fw_cfg_sysfs_entry {
struct kobject kobj;
- struct fw_cfg_file f;
+ u32 size;
+ u16 select;
+ char name[FW_CFG_MAX_FILE_PATH];
struct list_head list;
};

@@ -275,17 +277,17 @@ struct fw_cfg_sysfs_attribute fw_cfg_sysfs_attr_##_attr = { \

static ssize_t fw_cfg_sysfs_show_size(struct fw_cfg_sysfs_entry *e, char *buf)
{
- return sprintf(buf, "%u\n", e->f.size);
+ return sprintf(buf, "%u\n", e->size);
}

static ssize_t fw_cfg_sysfs_show_key(struct fw_cfg_sysfs_entry *e, char *buf)
{
- return sprintf(buf, "%u\n", e->f.select);
+ return sprintf(buf, "%u\n", e->select);
}

static ssize_t fw_cfg_sysfs_show_name(struct fw_cfg_sysfs_entry *e, char *buf)
{
- return sprintf(buf, "%s\n", e->f.name);
+ return sprintf(buf, "%s\n", e->name);
}

static FW_CFG_SYSFS_ATTR(size);
@@ -336,13 +338,13 @@ static ssize_t fw_cfg_sysfs_read_raw(struct file *filp, struct kobject *kobj,
{
struct fw_cfg_sysfs_entry *entry = to_entry(kobj);

- if (pos > entry->f.size)
+ if (pos > entry->size)
return -EINVAL;

- if (count > entry->f.size - pos)
- count = entry->f.size - pos;
+ if (count > entry->size - pos)
+ count = entry->size - pos;

- fw_cfg_read_blob(entry->f.select, buf, pos, count);
+ fw_cfg_read_blob(entry->select, buf, pos, count);
return count;
}

@@ -461,11 +463,13 @@ static int fw_cfg_register_file(const struct fw_cfg_file *f)
return -ENOMEM;

/* set file entry information */
- memcpy(&entry->f, f, sizeof(struct fw_cfg_file));
+ entry->size = be32_to_cpu(f->size);
+ entry->select = be16_to_cpu(f->select);
+ memcpy(entry->name, f->name, FW_CFG_MAX_FILE_PATH);

/* register entry under "/sys/firmware/qemu_fw_cfg/by_key/" */
err = kobject_init_and_add(&entry->kobj, &fw_cfg_sysfs_entry_ktype,
- fw_cfg_sel_ko, "%d", entry->f.select);
+ fw_cfg_sel_ko, "%d", entry->select);
if (err)
goto err_register;

@@ -475,7 +479,7 @@ static int fw_cfg_register_file(const struct fw_cfg_file *f)
goto err_add_raw;

/* try adding "/sys/firmware/qemu_fw_cfg/by_name/" symlink */
- fw_cfg_build_symlink(fw_cfg_fname_kset, &entry->kobj, entry->f.name);
+ fw_cfg_build_symlink(fw_cfg_fname_kset, &entry->kobj, entry->name);

/* success, add entry to global cache */
fw_cfg_sysfs_cache_enlist(entry);
@@ -507,8 +511,6 @@ static int fw_cfg_register_dir_entries(void)
fw_cfg_read_blob(FW_CFG_FILE_DIR, dir, sizeof(count), dir_size);

for (i = 0; i < count; i++) {
- dir[i].size = be32_to_cpu(dir[i].size);
- dir[i].select = be16_to_cpu(dir[i].select);
ret = fw_cfg_register_file(&dir[i]);
if (ret)
break;
--
2.16.1.73.g5832b7e9f2