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Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/xenfs/xenbus.c31
1 files changed, 13 insertions, 18 deletions
diff --git a/drivers/xen/xenfs/xenbus.c b/drivers/xen/xenfs/xenbus.c
index 1c12360..bbd000f 100644
--- a/drivers/xen/xenfs/xenbus.c
+++ b/drivers/xen/xenfs/xenbus.c
@@ -122,6 +122,7 @@ static ssize_t xenbus_file_read(struct file *filp,
int ret;
mutex_lock(&u->reply_mutex);
+again:
while (list_empty(&u->read_buffers)) {
mutex_unlock(&u->reply_mutex);
if (filp->f_flags & O_NONBLOCK)
@@ -144,7 +145,7 @@ static ssize_t xenbus_file_read(struct file *filp,
i += sz - ret;
rb->cons += sz - ret;
- if (ret != sz) {
+ if (ret != 0) {
if (i == 0)
i = -EFAULT;
goto out;
@@ -160,6 +161,8 @@ static ssize_t xenbus_file_read(struct file *filp,
struct read_buffer, list);
}
}
+ if (i == 0)
+ goto again;
out:
mutex_unlock(&u->reply_mutex);
@@ -407,6 +410,7 @@ static int xenbus_write_watch(unsigned msg_type, struct xenbus_file_priv *u)
mutex_lock(&u->reply_mutex);
rc = queue_reply(&u->read_buffers, &reply, sizeof(reply));
+ wake_up(&u->read_waitq);
mutex_unlock(&u->reply_mutex);
}
@@ -455,7 +459,7 @@ static ssize_t xenbus_file_write(struct file *filp,
ret = copy_from_user(u->u.buffer + u->len, ubuf, len);
- if (ret == len) {
+ if (ret != 0) {
rc = -EFAULT;
goto out;
}
@@ -488,21 +492,6 @@ static ssize_t xenbus_file_write(struct file *filp,
msg_type = u->u.msg.type;
switch (msg_type) {
- case XS_TRANSACTION_START:
- case XS_TRANSACTION_END:
- case XS_DIRECTORY:
- case XS_READ:
- case XS_GET_PERMS:
- case XS_RELEASE:
- case XS_GET_DOMAIN_PATH:
- case XS_WRITE:
- case XS_MKDIR:
- case XS_RM:
- case XS_SET_PERMS:
- /* Send out a transaction */
- ret = xenbus_write_transaction(msg_type, u);
- break;
-
case XS_WATCH:
case XS_UNWATCH:
/* (Un)Ask for some path to be watched for changes */
@@ -510,7 +499,8 @@ static ssize_t xenbus_file_write(struct file *filp,
break;
default:
- ret = -EINVAL;
+ /* Send out a transaction */
+ ret = xenbus_write_transaction(msg_type, u);
break;
}
if (ret != 0)
@@ -555,6 +545,7 @@ static int xenbus_file_release(struct inode *inode, struct file *filp)
struct xenbus_file_priv *u = filp->private_data;
struct xenbus_transaction_holder *trans, *tmp;
struct watch_adapter *watch, *tmp_watch;
+ struct read_buffer *rb, *tmp_rb;
/*
* No need for locking here because there are no other users,
@@ -573,6 +564,10 @@ static int xenbus_file_release(struct inode *inode, struct file *filp)
free_watch_adapter(watch);
}
+ list_for_each_entry_safe(rb, tmp_rb, &u->read_buffers, list) {
+ list_del(&rb->list);
+ kfree(rb);
+ }
kfree(u);
return 0;
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