struct file *file;
int ret;
ssize_t len;
- mm_segment_t old_fs;
file = filp_open("/proc/sys/kernel/random/boot_id", O_RDONLY, 0);
if (IS_ERR(file))
return PTR_ERR(file);
- old_fs = get_fs();
- set_fs(KERNEL_DS);
-
- if (!file->f_op || !file->f_op->read) {
- ret = -EINVAL;
- goto end;
- }
-
- len = file->f_op->read(file, bootid, BOOT_ID_LEN - 1, &file->f_pos);
+ len = kernel_read(file, bootid, BOOT_ID_LEN - 1, &file->f_pos);
if (len != BOOT_ID_LEN - 1) {
ret = -EINVAL;
goto end;
bootid[BOOT_ID_LEN - 1] = '\0';
ret = 0;
end:
- set_fs(old_fs);
filp_close(file, current->files);
return ret;
}