linux-kernel - [PATCH 11/16] hv: vmbus_open(): reset the channel state on ENOMEM

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Message-Id: <1423016804-22014-11-git-send-email-kys@microsoft.com>
Date:	Tue,  3 Feb 2015 18:26:39 -0800
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
	vkuznets@...hat.com
Cc:	Dexuan Cui <"[mailto:decui@...rosoft.com]"@linuxonhyperv.com>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Dexuan Cui <decui@...rosoft.com>
Subject: [PATCH 11/16] hv: vmbus_open(): reset the channel state on ENOMEM

From: Dexuan Cui <[mailto:decui@...rosoft.com]>

Without this patch, the state is put to CHANNEL_OPENING_STATE, and when
the driver is loaded next time, vmbus_open() will fail immediately due to
newchannel->state != CHANNEL_OPEN_STATE.

CC: "K. Y. Srinivasan" <kys@...rosoft.com>
Signed-off-by: Dexuan Cui <decui@...rosoft.com>
Reviewed-by: Jason Wang <jasowang@...hat.com>
Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 drivers/hv/channel.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 2978f5e..26dcf26 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -89,9 +89,10 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size,
 	out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
 		get_order(send_ringbuffer_size + recv_ringbuffer_size));
 
-	if (!out)
-		return -ENOMEM;
-
+	if (!out) {
+		err = -ENOMEM;
+		goto error0;
+	}
 
 	in = (void *)((unsigned long)out + send_ringbuffer_size);
 
@@ -199,6 +200,7 @@ error0:
 	free_pages((unsigned long)out,
 		get_order(send_ringbuffer_size + recv_ringbuffer_size));
 	kfree(open_info);
+	newchannel->state = CHANNEL_OPEN_STATE;
 	return err;
 }
 EXPORT_SYMBOL_GPL(vmbus_open);
-- 
1.7.4.1

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