linux-kernel - Re: [PATCH] Drivers: hv: vmbus: fix error return code in vmbus

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Message-ID: <CAPgLHd_7MKG75y0NiXFVV-w8dtRWPdT8CtrMWyN_a1LM0MD9Lw@mail.gmail.com>
Date:	Thu, 12 Sep 2013 08:25:47 +0800
From:	Wei Yongjun <weiyj.lk@...il.com>
To:	kys@...rosoft.com
Cc:	haiyangz@...rosoft.com, yongjun_wei@...ndmicro.com.cn,
	devel@...uxdriverproject.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Drivers: hv: vmbus: fix error return code in vmbus_connect()

On 09/12/2013 04:03 AM, KY Srinivasan wrote:
>
>> -----Original Message-----
>> From: Wei Yongjun [mailto:weiyj.lk@...il.com]
>> Sent: Wednesday, September 11, 2013 4:20 AM
>> To: KY Srinivasan; Haiyang Zhang
>> Cc: yongjun_wei@...ndmicro.com.cn; devel@...uxdriverproject.org; linux-
>> kernel@...r.kernel.org
>> Subject: [PATCH] Drivers: hv: vmbus: fix error return code in vmbus_connect()
>>
>> From: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
>>
>> Fix to return -EINVAL in the version check error handling
>> case instead of 0, as done elsewhere in this function.
> The return will not be zero in this case. If you look at the function 
> vmbus_negotiate_version(), in case the host refuses the version, the
> return value will be set to -ECONNREFUSED

look at the code:

 196         do {
 197                 ret = vmbus_negotiate_version(msginfo, version);
 198                 if (ret)
 199                         goto cleanup;
 200 
 201                 if (vmbus_connection.conn_state == CONNECTED)
 202                         break;
 203 
 204                 version = vmbus_get_next_version(version);
 205         } while (version != VERSION_INVAL);
 206 
 207         if (version == VERSION_INVAL)
 208                 goto cleanup;

if function vmbus_negotiate_version() return error, the code
will goto cleanup. 

If 'version == VERSION_INVAL' is true, I think we tried all
of the VERSION_WS2008/VERSION_WIN7/VERSION_WIN8, but still
can not get the connection.

 



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