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-rw-r--r--kernel/power/user.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/power/user.c b/kernel/power/user.c
index 24d7d78..d65305b 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -99,6 +99,8 @@ static ssize_t snapshot_read(struct file *filp, char __user *buf,
ssize_t res;
data = filp->private_data;
+ if (!data->ready)
+ return -ENODATA;
res = snapshot_read_next(&data->handle, count);
if (res > 0) {
if (copy_to_user(buf, data_of(data->handle), res))
@@ -245,7 +247,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
break;
case SNAPSHOT_UNFREEZE:
- if (!data->frozen)
+ if (!data->frozen || data->ready)
break;
mutex_lock(&pm_mutex);
thaw_processes();
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