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

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Date:	Thu, 13 Sep 2012 09:38:08 +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: [PATCH 1/2] HID: hid-sensor-hub: Clear HID_CLAIMED_INPUT bit earlier

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);
+	hdev->claimed &= ~HID_CLAIMED_INPUT;
 	if (ret) {
 		hid_err(hdev, "hw start failed\n");
 		goto err_free;
@@ -627,7 +630,6 @@ static void sensor_hub_remove(struct hid_device *hdev)
 	int i;
 
 	hid_dbg(hdev, " hardware removed\n");
-	hdev->claimed &= ~HID_CLAIMED_INPUT;
 	hid_hw_stop(hdev);
 	hid_hw_close(hdev);
 	spin_lock_irqsave(&data->lock, flags);
-- 
1.7.9.5



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