linux-kernel - [PATCH 3.12 54/86] Drivers: hv: get rid of timeout in vmbus

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Date:   Thu,  4 May 2017 11:04:19 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        "K . Y . Srinivasan" <kys@...rosoft.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 54/86] Drivers: hv: get rid of timeout in vmbus_open()

From: Vitaly Kuznetsov <vkuznets@...hat.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 396e287fa2ff46e83ae016cdcb300c3faa3b02f6 upstream.

vmbus_teardown_gpadl() can result in infinite wait when it is called on 5
second timeout in vmbus_open(). The issue is caused by the fact that gpadl
teardown operation won't ever succeed for an opened channel and the timeout
isn't always enough. As a guest, we can always trust the host to respond to
our request (and there is nothing we can do if it doesn't).

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
Signed-off-by: Sumit Semwal <sumit.semwal@...aro.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/hv/channel.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 8cddbd10dadb..6f1731573097 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -114,7 +114,7 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size,
 	struct vmbus_channel_msginfo *open_info = NULL;
 	void *in, *out;
 	unsigned long flags;
-	int ret, t, err = 0;
+	int ret, err = 0;
 
 	spin_lock_irqsave(&newchannel->sc_lock, flags);
 	if (newchannel->state == CHANNEL_OPEN_STATE) {
@@ -213,11 +213,7 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size,
 		goto error1;
 	}
 
-	t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ);
-	if (t == 0) {
-		err = -ETIMEDOUT;
-		goto error1;
-	}
+	wait_for_completion(&open_info->waitevent);
 
 
 	if (open_info->response.open_result.status)
-- 
2.12.2