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xen: unitialised return value in xenbus_write_transaction

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The return value of xenbus_write_transaction can be uninitialised in
the success case leading to the userspace xenstore utilities failing.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ian Campbell 2009-01-24 08:22:47 +00:00 committed by Ingo Molnar
parent 659d2618b3
commit e88a0faae5
1 changed files with 5 additions and 6 deletions
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11
drivers/xen/xenfs/xenbus.c
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@ -291,7 +291,7 @@ static void watch_fired(struct xenbus_watch *watch,
static int xenbus_write_transaction(unsigned msg_type, static int xenbus_write_transaction(unsigned msg_type,
struct xenbus_file_priv *u) struct xenbus_file_priv *u)
{ {
int rc, ret; int rc;
void *reply; void *reply;
struct xenbus_transaction_holder *trans = NULL; struct xenbus_transaction_holder *trans = NULL;
LIST_HEAD(staging_q); LIST_HEAD(staging_q);
@ -326,15 +326,14 @@ static int xenbus_write_transaction(unsigned msg_type,
} }
mutex_lock(&u->reply_mutex); mutex_lock(&u->reply_mutex);
ret = queue_reply(&staging_q, &u->u.msg, sizeof(u->u.msg)); rc = queue_reply(&staging_q, &u->u.msg, sizeof(u->u.msg));
if (!ret) if (!rc)
ret = queue_reply(&staging_q, reply, u->u.msg.len); rc = queue_reply(&staging_q, reply, u->u.msg.len);
if (!ret) { if (!rc) {
list_splice_tail(&staging_q, &u->read_buffers); list_splice_tail(&staging_q, &u->read_buffers);
wake_up(&u->read_waitq); wake_up(&u->read_waitq);
} else { } else {
queue_cleanup(&staging_q); queue_cleanup(&staging_q);
rc = ret;
} }
mutex_unlock(&u->reply_mutex); mutex_unlock(&u->reply_mutex);