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SubjectRe: [PATCH 1/3] Drivers: hv: vmbus: do cleanup on all vmbus_open() failure paths
Date
Dexuan Cui <decui@microsoft.com> writes:

>> -----Original Message-----
>> From: Vitaly Kuznetsov [mailto:vkuznets@redhat.com]
>> Sent: Tuesday, April 21, 2015 16:18
>> To: KY Srinivasan
>> Cc: Haiyang Zhang; devel@linuxdriverproject.org; linux-
>> kernel@vger.kernel.org; Dexuan Cui
>> Subject: [PATCH 1/3] Drivers: hv: vmbus: do cleanup on all vmbus_open()
>> failure paths
>>
>> In case there was an error reported in the response to the
>> CHANNELMSG_OPENCHANNEL
>> call we need to do the cleanup as a vmbus_open() user won't be doing it
>> after
>> receiving an error. The cleanup should be done on all failure paths.
>>
>> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
>> ---
>> drivers/hv/channel.c | 7 ++++---
>> 1 file changed, 4 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
>> index 54da66d..836386f 100644
>> --- a/drivers/hv/channel.c
>> +++ b/drivers/hv/channel.c
>> @@ -186,11 +186,12 @@ int vmbus_open(struct vmbus_channel
>> *newchannel, u32 send_ringbuffer_size,
>> list_del(&open_info->msglistentry);
>> spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock,
>> flags);
>>
>> - if (err == 0)
>> - newchannel->state = CHANNEL_OPENED_STATE;
>> + if (err != 0)
>> + goto error_gpadl;
>>
>> + newchannel->state = CHANNEL_OPENED_STATE;
>> kfree(open_info);
>> - return err;
>> + return 0;
>>
>> error1:
>> spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
>> --
>
> Thanks for the patch, Vitaly!
>
> The patch looks good to me except for 1 small issue:
> I suppose open_info->response.open_result.status is different from
> Linux-style -EXXX error codes.
>
> Maybe here we can return -EAGAIN if err != 0 ?

I think I inspected all vmbus_open() callers and they all just check ret
!= 0 but I agree we'd better return some -EXXXX code here. I'm not
exactly sure if open_result.status != 0 usually means a permanent or a
temporary failure but if it's temporary -EAGAIN here seems reasonable.

I'll send v2, thanks for the review!

>
> -- Dexuan

--
Vitaly


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