linux-kernel - [PATCH] xenbus: don't look up transaction IDs for ordinary writes

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Date:	Mon, 15 Aug 2016 09:02:38 -0600
From:	"Jan Beulich" <JBeulich@...e.com>
To:	<david.vrabel@...rix.com>, <boris.ostrovsky@...cle.com>,
	"Juergen Gross" <JGross@...e.com>
Cc:	<xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] xenbus: don't look up transaction IDs for ordinary
 writes

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 <rschuetz@...-koblenz.de>
Cc: <stable@...r.kernel.org>
Signed-off-by: Jan Beulich <jbeulich@...e.com>
Tested-by: Richard Schütz <rschuetz@...-koblenz.de>
---
 drivers/xen/xenbus/xenbus_dev_frontend.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 4.8-rc2/drivers/xen/xenbus/xenbus_dev_frontend.c
+++ 4.8-rc2-xen-xenbus-dev-write-oridinary/drivers/xen/xenbus/xenbus_dev_frontend.c
@@ -316,7 +316,7 @@ 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;