[PATCH 3.2 151/152] xenbus: don't look up transaction IDs for ordinary writes

[Ben Hutchings]

3.2.84-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Jan Beulich <jbeul...@suse.com>

commit 9a035a40f7f3f6708b79224b86c5777a3334f7ea upstream.

This should really only be done for XS_TRANSACTION_END messages, or
else at least some of the xenstore-* tools don't work anymore.

Fixes: 0beef634b8 ("xenbus: don't BUG() on user mode induced condition")
Reported-by: Richard Schütz <rschu...@uni-koblenz.de>
Signed-off-by: Jan Beulich <jbeul...@suse.com>
Tested-by: Richard Schütz <rschu...@uni-koblenz.de>
Signed-off-by: David Vrabel <david.vra...@citrix.com>
Cc: Ed Swierk <eswi...@skyportsystems.com>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
 drivers/xen/xenfs/xenbus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/xen/xenfs/xenbus.c
+++ b/drivers/xen/xenfs/xenbus.c
@@ -310,7 +310,7 @@ static int xenbus_write_transaction(unsi
                        rc = -ENOMEM;
                        goto out;
                }
-       } else {
+       } else if (msg_type == XS_TRANSACTION_END) {
                list_for_each_entry(trans, &u->transactions, list)
                        if (trans->handle.id == u->u.msg.tx_id)
                                break;