linux-kernel - Re: [PATCH 1/2] HID: hid-sensor-hub: Clear HID_CLAIMED

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Date:	Thu, 13 Sep 2012 21:25:07 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	srinivas pandruvada <srinivas.pandruvada@...el.com>,
	Jonathan Cameron <jic23@...nel.org>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] HID: hid-sensor-hub: Clear HID_CLAIMED_INPUT bit earlier

2012/9/13 Axel Lin <axel.lin@...il.com>:
> Clear HID_CLAIMED_INPUT bit of hdev->claimed, this prevents calling
> hidinput_disconnect() in hid_disconnect(), which is called by hid_hw_stop().
>
> We need to clear HID_CLAIMED_INPUT bit earlier rather than in
> sensor_hub_remove() because we also call hid_hw_stop() in sensor_hub_probe
> error handling.
>
> Also adds comments for why we set hdev->claimed = HID_CLAIMED_INPUT.
>
> Signed-off-by: Axel Lin <axel.lin@...il.com>
> ---
> Hi srinivas,
> I don't have this hardware, I'd appreciate if you can test these patches.
> Axel
>
>  drivers/hid/hid-sensor-hub.c |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c
> index 4ac759c..50bc8c7 100644
> --- a/drivers/hid/hid-sensor-hub.c
> +++ b/drivers/hid/hid-sensor-hub.c
> @@ -539,8 +539,11 @@ static int sensor_hub_probe(struct hid_device *hdev,
>         }
>         INIT_LIST_HEAD(&hdev->inputs);
>
> +       /* We don't use hidinput but hid_hw_start() fails if nothing is
> +        * claimed. So spoof claimed input. */
>         hdev->claimed = HID_CLAIMED_INPUT;
>         ret = hid_hw_start(hdev, 0);

I check the implementation of hid_hw_start again, it looks
hid_hw_start allows connect_mask to be 0.
So we don't need setting  "hdev->claimed = HID_CLAIMED_INPUT;" here.
Comments?

Axel
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