linux-kernel - RE: [PATCH 1/3] Drivers: hv: utils: fix hvt_op_poll() return value on transport destroy

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Date:	Wed, 16 Dec 2015 06:37:19 +0000
From:	Dexuan Cui <decui@...rosoft.com>
To:	KY Srinivasan <kys@...rosoft.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"vkuznets@...hat.com" <vkuznets@...hat.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>
Subject: RE: [PATCH 1/3] Drivers: hv: utils: fix hvt_op_poll() return value on
 transport destroy

> From: devel [mailto:driverdev-devel-bounces@...uxdriverproject.org] On Behalf
> Of K. Y. Srinivasan
> Sent: Wednesday, December 16, 2015 8:27
> To: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; olaf@...fle.de; apw@...onical.com;
> vkuznets@...hat.com; jasowang@...hat.com
> Subject: [PATCH 1/3] Drivers: hv: utils: fix hvt_op_poll() return value on transport
> destroy
> 
> From: Vitaly Kuznetsov <vkuznets@...hat.com>
> 
> The return type of hvt_op_poll() is unsigned int and -EBADF is
> inappropriate, poll functions return POLL* statuses.
> 
> Reported-by: Dexuan Cui <decui@...rosoft.com>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> ---
>  drivers/hv/hv_utils_transport.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/hv/hv_utils_transport.c b/drivers/hv/hv_utils_transport.c
> index ee20b50..4f42c0e 100644
> --- a/drivers/hv/hv_utils_transport.c
> +++ b/drivers/hv/hv_utils_transport.c
> @@ -109,7 +109,7 @@ static unsigned int hvt_op_poll(struct file *file,
> poll_table *wait)
>  	poll_wait(file, &hvt->outmsg_q, wait);
> 
>  	if (hvt->mode == HVUTIL_TRANSPORT_DESTROY)
> -		return -EBADF;
> +		return POLLERR | POLLHUP;
> 
>  	if (hvt->outmsg_len > 0)
>  		return POLLIN | POLLRDNORM;
> --

Hi Vitaly,
The daemon only polls on POLLIN.
I'm not sure returning "POLLERR | POLLHUP" here can wake up the daemon or not.

Thanks,
-- Dexuan
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