linux-kernel - [PATCH v3 2/2] xenbus: req->err should be updated before req->state

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Message-Id: <20200303221423.21962-2-dongli.zhang@oracle.com>
Date:   Tue,  3 Mar 2020 14:14:23 -0800
From:   Dongli Zhang <dongli.zhang@...cle.com>
To:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Cc:     julien@....org, boris.ostrovsky@...cle.com, jgross@...e.com,
        sstabellini@...nel.org, joe.jin@...cle.com
Subject: [PATCH v3 2/2] xenbus: req->err should be updated before req->state

This patch adds the barrier to guarantee that req->err is always updated
before req->state.

Otherwise, read_reply() would not return ERR_PTR(req->err) but
req->body, when process_writes()->xb_write() is failed.

Signed-off-by: Dongli Zhang <dongli.zhang@...cle.com>
---
 drivers/xen/xenbus/xenbus_comms.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/xen/xenbus/xenbus_comms.c b/drivers/xen/xenbus/xenbus_comms.c
index 852ed161fc2a..eb5151fc8efa 100644
--- a/drivers/xen/xenbus/xenbus_comms.c
+++ b/drivers/xen/xenbus/xenbus_comms.c
@@ -397,6 +397,8 @@ static int process_writes(void)
 	if (state.req->state == xb_req_state_aborted)
 		kfree(state.req);
 	else {
+		/* write err, then update state */
+		virt_wmb();
 		state.req->state = xb_req_state_got_reply;
 		wake_up(&state.req->wq);
 	}
-- 
2.17.1